Transmission symbols mapping for antenna diversity

• US 20080304593A1
• Filed: 05/13/2008
• Published: 12/11/2008
• Est. Priority Date: 06/06/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Khan, Farooq, Zhang, Jianzhong, Tsai, Jiann-An
• Granted Patent: US 7,991,063 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/12 Frequency diversity

Abstract

Methods and apparatus for transmitting data via multiple antennas by using antenna diversity. A transmission diversity scheme is established such that two transmission matrices that are in accordance with the space frequency block code combined with Frequency switched transmit diversity (SFBC+FSTD) scheme, are alternatively applied in either the frequency domain, or the time domain, or both of the frequency domain or then time domain. The symbols in the transmission matrices may be transmitted either as one burst in a primary broadcast channel (PBCH), or as discrete bursts in the primary broadcast channel.

Claims

1. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a frequency domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas in accordance with the transmit diversity scheme.

2. The method of claim 1, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

3. The method of claim 1, comprised of the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the frequency domain for two times, with:

one of the two transmission matrices T₁ and T₂ being applied to the first transmission; and

the other one of the two transmission matrices T₁ and T₂ being applied to the second transmission.

4. The method of claim 3, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

5. The method of claim 1, comprised of the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the frequency domain for N times, with N being a positive number and N>

1, with;

one of the two transmission matrices T₁ and T₂ being applied to odd numbered transmissions; and

the other one of the two transmission matrices T₁ and T₂ being applied to even numbered transmissions.

6. The method of claim 5, comprised of:

the first through (N−

1)-th transmissions being full repetitions; and

the N-th transmission being a partial repetition.

7. The method of claim 5, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

8. The method of claim 1, comprised of transmitting the four symbols as a burst of signal in a primary broadcast channel, with the transmission being in accordance with the transmit diversity scheme.

9. The method of claim 8, comprised of transmitting two bursts in a certain time interval, with the transmission of each burst being in accordance with the transmit diversity scheme.

10. A method for transmission in a communication system, the method comprising the steps of:

calculating cyclic redundancy checks for a plurality of information bits to be transmitted;

appending the calculated cyclic redundancy checks to the plurality of information bits to generate a transport block;

convolving the transport block by applying a convolution code to the transport block to generate a convolved transport block;

interleaving the convolved transport block to generated an interleaved codeword;

repeating the interleaved codeword for several times;

modulating the repeated interleaved codewords by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a frequency domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas as a burst of signal in a primary broadcast channel, with the transmission being in accordance with the transmit diversity scheme.

11. The method of claim 10, further comprising transmitting two bursts in a certain time interval, with the transmission of each burst being in accordance with the transmit diversity scheme.

12. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a time domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas in accordance with the transmit diversity scheme.

13. The method of claim 12, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

14. The method of claim 12, comprised of the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the time domain for two times, with:

one of the two transmission matrices T₁ and T₂ being applied to the first transmission in a first time slot; and

the other one of the two transmission matrices T₁ and T₂ being applied to the second transmission in a second time slot.

15. The method of claim 14, comprised of transmitting the symbols in both of the both of the first time slot and the second time slot as one burst of signal in a primary broadcast channel transmission, with the first time slot and the second time slot being located within the same subframe.

16. The method of claim 14, comprised of:

transmitting the symbols in the first time slot as a first burst of signal in a primary broadcast channel transmission; and

transmitting the symbols in the second time slot as a second burst of signal in the primary broadcast channel transmission, with the first burst and the second burst being separated by a certain time interval.

17. The method of claim 14, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

18. The method of claim 12, comprised of the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the time domain for a plurality of times, with:

one of the two transmission matrices T₁ and T₂ being applied to the odd numbered transmissions in odd numbered time slots; and

the other one of the two transmission matrices T₁ and T₂ being applied to the even numbered transmissions in even numbered time slots.

19. The method of claim 18, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

20. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols by alternatively applying two transmission matrices T₁ and T₂ in both of a time domain and a frequency domain, with the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and 54 via four antennas in accordance with the transmit diversity scheme.

21. The method of claim 20, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

22. The method of claim 20, with the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the frequency domain over eight subcarriers, and are repeatedly transmitted in the time domain for two times over two time slots, with:

in a first time slot, a first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers, and a second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers; and

in a second time slot, the second one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers, and the first one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers.

23. The method of claim 22, comprised of transmitting the symbols in the first and second time slots as one burst of signal in a primary broadcast channel transmission, with the first time slot and the second time slot being located within the same subframe.

24. The method of claim 22, comprised of:

transmitting the symbols in the first time slot as a first burst of signal in a primary broadcast channel transmission; and

transmitting the symbols in the second time slot as a second burst of signal in the primary broadcast channel transmission, with the first burst and the second burst being separated by a certain time interval.

25. The method of claim 22, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

26. The method of claim 20, with the transmit diversity scheme being established such that the four symbols are repeatedly transmitted for four times over eight subcarriers four time slots, with:

in a first time slot, a first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers;

in a second time slot, a second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers;

in a third time slot, the first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers; and

in a fourth time slot, the second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers.

27. The method of claim 26, further comprising exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

28. A method for decoding signal in a communication system, the method comprising the steps of:

receiving a first burst of signal and a second burst of signal within a radio subframe;

decoding the second burst of signal by applying a first space frequency block code format in which a transmission matrix T₁ is established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier;

determining whether the second burst of signal is successfully decoded;

when the second burst of signal is not successfully decoded, softly combining the first burst of signal and the second burst of signal to generate a combined signal, and decoding the combined signal by applying the first space frequency block code format to the first burst of signal, and applying a second space frequency block code format to the second burst of signal, with a transmission matrix T₂ within the second space frequency block code format being established by;

$T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier;

determining whether the combined signal is successfully decoded; and

when the combined signal is not successfully decoded, buffering the second burst of signal.

29. A method for decoding signal in a communication system, the method comprising the steps of:

receiving a first burst of signal and a second burst of signal within a radio subframe;

decoding the second burst of signal by applying a first space frequency block code format in which a transmission matrix T₁ and a transmission matrix T₂ are sequentially applied in a frequency domain, with the transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier;

determining whether the second burst of signal is successfully decoded;

when the second burst of signal is not successfully decoded, softly combining the first burst of signal and the second burst of signal to generate a combined signal, and decoding the combined signal by applying the first space frequency block code format to the first burst of signal, and applying a second space frequency block code format to the second burst of signal, with, in the second space frequency block code format, the transmission matrix T₂ and the transmission matrix T₁ being sequentially applied in the frequency domain;

determining whether the combined signal is successfully decoded; and

when the combined signal is not successfully decoded, buffering the second burst of signal.

30. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a frequency domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas in accordance with the transmit diversity scheme.

31. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a time domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas in accordance with the transmit diversity scheme.

32. A method for transmission in a communication system, the method comprising:

modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols by alternatively applying two transmission matrices T₁ and T₂ in both of a time domain and a frequency domain, with the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

transmitting the four symbols S₁, S₂, S₃ and S₄ via four antennas in accordance with the transmit diversity scheme.

33. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a frequency domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.

34. The wireless terminal of claim 33, comprised of the processing unit exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

35. The wireless terminal of claim 33, comprised of the wireless terminal transmitting the four symbols as a burst of signal in a primary broadcast channel, with the transmission being in accordance with the transmit diversity scheme.

36. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a time domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.

37. The wireless terminal of claim 36, comprised of the processing unit exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

38. The wireless terminal of claim 36, comprised of the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the time domain for two times, with:

one of the two transmission matrices T₁ and T₂ being applied to the first transmission in a first time slot; and

the other one of the two transmission matrices T₁ and T₂ being applied to the second transmission in a second time slot.

39. The wireless terminal of claim 38, comprised of the wireless terminal transmitting the symbols in both of the first time slot and the second time slot as one burst of signal in a primary broadcast channel transmission, with the first time slot and the second time slot being located within the same subframe.

40. The wireless terminal of claim 38, comprised of the wireless terminal:

transmitting the symbols in the first time slot as a first burst of signal in a primary broadcast channel transmission; and

transmitting the symbols in the second time slot as a second burst of signal in the primary broadcast channel transmission, with the first burst and the second burst being separated by a certain time interval.

41. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols by alternatively applying two transmission matrices T₁ and T₂ in both of a time domain and a frequency domain, with the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.

42. The wireless terminal of claim 41, comprised of the processing unit exchanging the second row and the third row of each of the transmission matrices T₁ and T₂, such that the symbols on the second row of each of the transmission matrices T₁ and T₂ are transmitted via the third antenna, and the symbols on the third row of each of the transmission matrices are transmitted via the second antenna.

43. The wireless terminal of claim 41, with the transmit diversity scheme being established such that the four symbols are repeatedly transmitted in the frequency domain over eight subcarriers, and are repeatedly transmitted in the time domain for two times over two time slots, with:

in a first time slot, a first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers, and a second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers; and

in a second time slot, the second one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers, and the first one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers.

44. The wireless terminal of claim 41, with the transmit diversity scheme being established such that the four symbols are repeatedly transmitted for four times over eight subcarriers four time slots, with:

in a first time slot, a first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers;

in a second time slot, a second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers;

in a third time slot, the first one of the transmission matrix matrices T₁ and T₂ being applied to the first four subcarriers; and

in a fourth time slot, the second one of the transmission matrix matrices T₁ and T₂ being applied to the last four subcarriers.

45. A wireless terminal a communication system, comprising:

a memory unit storing a first burst of signal and a second burst of signal that are received within a radio subframe; and

a decoding unit decoding the received signals, with the decoding unit;

decoding the second burst of signal by applying a first space frequency block code format in which a transmission matrix T₁ is established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier;

determining whether the second burst of signal is successfully decoded; and

when the second burst of signal is not successfully decoded, softly combining the first burst of signal and the second burst of signal to generate a combined signal, and decoding the combined signal by applying the first space frequency block code format to the first burst of signal, and applying a second space frequency block code format to the second burst of signal, with a transmission matrix T₂ within the second space frequency block code format being established by;

$T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier.

46. A wireless terminal in a communication system, comprising:

a memory unit storing a first burst of signal and a second burst of signal that are received within a radio subframe; and

a decoding unit decoding the received signals, with the decoding unit;

decoding the second burst of signal by applying a first space frequency block code format in which a transmission matrix T₁ and a transmission matrix T₂ are sequentially applied in a frequency domain, with the transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_1& S_2& 0& 0\\ -S_2^{*}& S_1^{*}& 0& 0\\ 0& 0& S_3& S_4\\ 0& 0& -S_4^{*}& S_3^{*}\end{array}\right],<br><br>T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\left[\begin{array}{cccc}{S}_3& S_4& 0& 0\\ -S_4^{*}& S_3^{*}& 0& 0\\ 0& 0& S_1& S_2\\ 0& 0& -S_2^{*}& S_1^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier;

determining whether the second burst of signal is successfully decoded; and

when the second burst of signal is not successfully decoded, softly combining the first burst of signal and the second burst of signal to generate a combined signal, and decoding the combined signal by applying the first space frequency block code format to the first burst of signal, and applying a second space frequency block code format to the second burst of signal, with, in the second space frequency block code format, the transmission matrix T₂ and the transmission matrix T₁ being sequentially applied in the frequency domain.

47. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a frequency domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.

48. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols, with the transmit diversity scheme being established such that two transmission matrices T₁ and T₂ are alternatively applied in a time domain, and the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.

49. A wireless terminal in a communication system, comprising:

a modulation unit modulating data to be transmitted by using a certain modulation scheme to generate a plurality of modulated symbols;

a processing unit establishing a transmit diversity scheme for at least a group of four symbols S₁, S₂, S₃ and S₄ from among the plurality of modulated symbols by alternatively applying two transmission matrices T₁ and T₂ in both of a time domain and a frequency domain, with the two transmission matrices T₁ and T₂ being respectively established by;

$T_1=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],<br><br>\mathrm{and}$ $T_2=\left[\begin{array}{cccc}{T}_{11}& T_{12}& T_{13}& T_{14}\\ T_{21}& T_{22}& T_{23}& T_{24}\\ T_{31}& T_{32}& T_{33}& T_{34}\\ T_{41}& T_{42}& T_{43}& T_{44}\end{array}\right]=\frac{1}{\sqrt{4}}<br><br>\left[\begin{array}{cccc}{S}_1& -S_2^{*}& S_1& -S_2^{*}\\ S_3& -S_4^{*}& -S_3& S_4^{*}\\ S_2& S_1^{*}& S_2& S_1^{*}\\ S_4& S_3^{*}& -S_4& -S_3^{*}\end{array}\right],$

where T_ij represents the symbol to be transmitted on the ith antenna and the jth subcarrier; and

four antennas transmitting the four symbols S₁, S₂, S₃ and S₄ in accordance with the transmit diversity scheme.