Apparatus and method for transmitting and receiving data using space-time block coding

• US 20070291638A1
• Filed: 06/01/2007
• Published: 12/20/2007
• Est. Priority Date: 11/04/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chae, Chan-Byoung, Yun, Sung-Ryul, Jeong, Hong-Sil, Roh, Won-Il, Oh, Jeong-Tae, Ko, Kyun-Byoung, Jung, Young-Ho, Chung, Jae-Hak, Nam, Seung-hoon
• Application Number:
  US11/809,671
• Publication Number:
  US 20070291638A1
• Time in Patent Office: Days
• US Class Current: 370/208
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04L 1/0618 Space-time coding

Abstract

A space-time block coding (STBC) apparatus and method for a transmitter with four Tx antennas is provided. An input symbol sequence is transmitted through the four Tx antennas in a predetermined method based on feedback information received from a receiver, thereby improving the performance of an STBC.

Claims

1. A transmitter with four transmit antennas in a communication system, comprising:

an encoder for generating a coded symbol by encoding an input symbol sequence;

a grouping block for selecting an antenna grouping pattern based on feedback channel quality information (CQI) for each antenna received from a receiver and generating a grouping symbol vector by multiplying the coded symbol by the antenna grouping pattern; and

OFDM (Orthogonal Frequency Division Multiplexing) modulators for OFDM modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

2. The transmitter of claim 1, wherein the transmitter is used for a space-time block coding (STBC) communication system with four transmit antennas.

3. The transmitter of claim 1, wherein the transmitter is used for a space-time-frequency block coding (STFBC) communication system with four transmit antennas.

4. The transmitter of claim 1, further comprising a mapper for modulating the coded symbol, generating the modulated symbol and transmitting the modulated symbol to the grouping block.

5. The transmitter of claim 1, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the grouping block selects the antenna grouping pattern based on the feedback CQI by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antenna.

6. The transmitter of claim 1, wherein the four transmit antennas are in the transmitter and two receive antennas are in the receiver, and the grouping block selects the antenna grouping pattern based on the feedback CQI by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m, n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the two receive antennas, and h_i=(|h_1i|²+|h_2i|²)/2 where h_1i and h_2i denote channel values between an i^th transmit antenna and a first receive antenna and between the i^th transmit antenna and a second receive antenna, respectively.

7. The transmitter of claim 1, wherein the grouping block selects one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

8. The transmitter of claim 1, wherein the grouping symbol vector is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.

9. A transmitter with four transmit antennas in a communication system, comprising:

an encoder for generating a coded symbol by encoding an input symbol sequence;

a grouping block for selecting an antenna grouping pattern based on a feedback grouping index received from a receiver and generating a grouping symbol vector by multiplying the coded symbol by the antenna grouping pattern; and

OFDM (Orthogonal Frequency Division Multiplexing) modulators for OFDM modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

10. The transmitter of claim 9, wherein the transmitter is used for a space-time block coding (STBC) communication system with four transmit antennas.

11. The transmitter of claim 9, wherein the transmitter is used for a space-time-frequency block coding (STFBC) communication system with four transmit antennas.

12. The transmitter of claim 9, further comprising a mapper for modulating the coded symbol, generating the modulated symbol and transmitting the modulated symbol to the grouping block.

13. The transmitter of claim 9, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the feedback grouping index from the receiver is selected based on feedback channel quality information (CQI) by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antenna.

14. The transmitter of claim 9, wherein the four transmit antennas are in the transmitter and two receive antennas are in the receiver, and the feedback grouping index from the receiver is selected based on feedback channel quality information (CQI) by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m, n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the two receive antennas, and h_i=(|h_1i|²+|h_2i|²)/2 where h_1i and h_2i denote channel values between an i^th transmit antenna and a first receive antenna and between the i^th transmit antenna and a second receive antenna, respectively.

15. The transmitter of claim 9, wherein the grouping block selects one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

16. The transmitter of claim 9, wherein the grouping symbol vector is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.

17. A receiver for receiving a signal from a transmitter with four transmit antennas in a communication system, comprising:

a channel estimator for generating channel quality information (CQI) using a signal received through a receive antenna; and

a feedback transmitter for transmitting the CQI for each antenna to a grouping block of the transmitter so that the grouping block can select an antenna grouping pattern based on the CQI.

18. A receiver for receiving a signal from a transmitter with four transmit antennas in a communication system, comprising:

a channel estimator for generating channel quality information (CQI) using a signal received through a receive antenna; and

a feedback transmitter for transmitting a grouping index indicating an antenna grouping pattern selected according to the CQI for each antenna to a grouping block of the transmitter.

19. The receiver of claim 18, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the feedback transmitter selects the antenna grouping pattern by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antenna.

20. The receiver of claim 18, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the feedback transmitter selects one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

21. A transmission method for four transmit antennas in a communication system, comprising the steps of:

generating a coded symbol by encoding an input symbol sequence in a predetermined coding method;

selecting an antenna grouping pattern based on feedback channel quality information (CQI) for each antenna received from a receiver and generating a grouping symbol vector by multiplying the coded symbol by the antenna grouping pattern; and

OFDM (Orthogonal Frequency Division Multiplexing) modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

22. The transmission method of claim 21, wherein the transmission method is used for a space-time block coding (STBC) communication system with four transmit antennas.

23. The transmission method of claim 21, wherein the transmission method is used for a space-time-frequency block coding (STFBC) communication system with four transmit antennas.

24. The transmission method of claim 21, wherein the four transmit antennas are in a transmitter and one receive antenna is in the receiver, and the antenna grouping pattern selection step comprises selecting the antenna grouping pattern based on the feedback CQI by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antenna.

25. The transmission method of claim 21, wherein the four transmit antennas are in the transmitter and two receive antennas are in the receiver, and the antenna grouping pattern selection step comprises selecting the antenna grouping pattern based on the feedback CQI by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the transmit antennas and the receive antennas, and h_i=(|h_1i|²+|h_2i|²)/2 where h_1i and h_2i denote channel values between an i^th transmit antenna and a first receive antenna and between the i^th transmit antenna and a second receive antenna, respectively.

26. The transmission method of claim 21, wherein the antenna grouping pattern selection step comprises selecting one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

27. The transmission method of claim 21, wherein the grouping symbol vector is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.

28. A transmission method for four transmit antennas in a communication system, comprising the steps of:

generating a coded symbol by encoding an input symbol sequence in a predetermined coding method;

selecting an antenna grouping pattern based on a feedback grouping index for each antenna received from a receiver and generating a grouping symbol vector by multiplying the coded symbol by the antenna grouping pattern; and

OFDM (Orthogonal Frequency Division Multiplexing) modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

29. The transmission method of claim 28, wherein the transmission method is used for a space-time block coding (STBC) communication system with four transmit antennas.

30. The transmission method of claim 28, wherein the transmission method is used for a space-time-frequency block coding (STFBC) communication system with four transmit antennas.

31. The transmission method of claim 28, wherein the four transmit antennas are in a transmitter and one receive antenna is in the receiver, and the feedback grouping index from the receiver is selected based on feedback channel quality information (CQI) by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antenna.

32. The transmission method of claim 28, wherein the four transmit antennas are in the transmitter and two receive antennas are in the receiver, and the feedback grouping index from the receiver is selected based on feedback channel quality information (CQI) by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the four transmit antennas and the receive antennas, and h_i=(|h_1i|²+|h_2i|²)/2 where h_1i and h_2i denote channel values between an i^th transmit antenna and a first receive antenna and between the i^th transmit antenna and a second receive antenna, respectively.

33. The transmission method of claim 28, wherein the antenna grouping pattern selection step comprises selecting one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

34. The transmission method of claim 28, wherein the grouping symbol vector is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.

35. A reception method for receiving a signal from a transmitter with four transmit antennas in a communication system, comprising the steps of:

generating channel quality information (CQI) using a signal received through a receive antenna; and

transmitting the CQI to a grouping block of the transmitter so that the grouping block can select an antenna grouping pattern based on the CQI.

36. A reception method for receiving a signal from a transmitter with four transmit antennas in a communication system, comprising the steps of:

generating channel quality information (CQI) using a signal received through a receive antenna;

selecting an antenna grouping pattern according to the CQI; and

transmitting a grouping index indicating the antenna grouping pattern to a grouping block of the transmitter.

37. The reception method of claim 36, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the antenna grouping pattern selection step comprises selecting the antenna grouping pattern by

arg min|ρ

₁−

ρ

₂|
ρ

₁=|h_i|²+|h_j|², ρ

₂=|h_m|²+|h_n|²

where i, j, m and n range from 1 to 4 and h values are channel coefficients between the transmit antennas and the receive antenna.

38. The reception method of claim 36, wherein the four transmit antennas are in the transmitter and one receive antenna is in the receiver, and the antenna grouping pattern selection step comprises selecting one of the following antenna grouping patterns:

${\mathrm{AG}}_1=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 1& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_2=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 1& 0& 0\\ 0& 0& 0& 1\end{array}\right]$ ${\mathrm{AG}}_3=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& 1\\ 0& 1& 0& 0\end{array}\right]$

39. A transmission method for four transmit antennas in a communication system, comprising the steps of:

generating a coded symbol by encoding an input symbol sequence in a predetermined coding method;

selecting an antenna grouping pattern based on feedback channel quality information (CQI) for each antenna received from a receiver and generating a grouping symbol vector by applying the coded symbol to the selected antenna grouping pattern; and

OFDM (Orthogonal Frequency Division Multiplexing) modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

40. The transmission method of claim 39, wherein the selected antenna grouping pattern is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.

41. A transmitter with four transmit antennas in a communication system, comprising:

an encoder for generating a coded symbol vector by encoding an input symbol sequence in a predetermined coding method;

a grouping block for selecting an antenna grouping pattern based on feedback channel quality information (CQI) for each antenna received from a receiver and generating a grouping symbol vector by applying the coded symbol to the selected antenna grouping pattern; and

an OFDM (Orthogonal Frequency Division Multiplexing) modulator for OFDM modulating the grouping symbol vector and transmitting OFDM modulated symbols through the four transmit antennas.

42. The transmitter of claim 41, wherein the selected antenna grouping pattern is one of the following matrices:

$A_1=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_2=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ s_2& s_1^{*}& 0& 0\\ 0& 0& s_4& s_3^{*}\end{array}\right]$ $A_3=\left[\begin{array}{cccc}{s}_1& -s_2^{*}& 0& 0\\ 0& 0& s_3& -s_4^{*}\\ 0& 0& s_4& s_3^{*}\\ s_2& s_1^{*}& 0& 0\end{array}\right]$

where the columns of the matrices represent time and the rows represent four transmit antennas.