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

• US 20080260053A1
• Filed: 06/01/2007
• Published: 10/23/2008
• Est. Priority Date: 11/04/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jung, Young-Ho, Nam, Seung-Hoon, Jeong, Hong-Sil, Chung, Jae-Hak, Chae, Chan-Byoung, Ko, Kyun-Byoung, Oh, Jeong-Tae, Yun, Sung-Ryul, Roh, Won-Il
• Application Number:
  US11/809,571
• Publication Number:
  US 20080260053A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 1/0693 Partial feedback, e.g. partial channel state information [CSI]

Abstract

An STFBC coding apparatus for a transmitter with four Tx antennas is provided. In the transmitter, an encoder generates a code symbol vector by encoding an input symbol sequence in a predetermined coding method. A grouping block permutes the elements of the code symbol vector by multiplying the code symbol vector by a permutation antenna grouping pattern selected among predetermined permutation antenna grouping patterns according to a predetermined order and outputs the permuted code symbol vector as a grouping symbol vector. OFDM (Orthogonal Frequency Division Multiplexing) modulators OFDM modulate the grouping symbol vectors and transmit OFDM modulated symbols through the four transmit antennas.

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 in a predetermined coding method;

a grouping block for permuting elements of the coded symbol to produce a permuted code symbol vector by multiplying the coded symbol by a permutation antenna grouping pattern selected among predetermined permutation antenna grouping patterns according to a predetermined order and outputting the permuted code symbol vector as grouping symbol vectors; and

OFDM (Orthogonal Frequency Division Multiplexing) modulators for OFDM modulating the grouping symbol vectors 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 predetermined permutation antenna grouping patterns are expressed as the following matrices:

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

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

6. The transmitter of claim 1, wherein the permutation antenna grouping pattern A_k (k=1, 2 or 3) is selected by

A_k:

k=mod(floor(logical data subcarrier number−

1)/2,

     3)+1

where the logical data subcarrier number={1, 2, 3, . . . , total number of subcarriers}.

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

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

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

8. 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 a permutation antenna grouping pattern among predetermined permutation antenna grouping patterns according to a predetermined order, permuting elements of the code symbol vector to produce a permuted code symbol vector by multiplying the coded symbol by the selected permutation antenna grouping pattern, and outputting the permuted code symbol vector as grouping symbol vectors; and

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

9. The transmission method of claim 8, wherein the transmission method is for a space-time block coding (STBC) communication system with four transmit antennas.

10. The transmission method of claim 8, wherein the transmission method is for a space-time-frequency block coding (STFBC) communication system with four transmit antennas.

11. The transmitter of claim 8, further comprising a mapper for modulating the coded symbol, generating the modulated symbol and transmitting the modulated symbol to the grouping block.

12. The transmission method of claim 8, wherein the predetermined permutation antenna grouping patterns are expressed as the following matrices:

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

13. The transmission method of claim 8, wherein the permutation antenna grouping pattern selecting step comprises selecting the permutation antenna grouping pattern A_k (k=1, 2 or 3) by

A_k:

k=mod(floor(logical data subcarrier number−

1)/2,

     3)+1

where the logical data subcarrier number={1, 2, 3, . . . , total number of subcarriers}.

14. The transmission method of claim 8, wherein the grouping symbol vector is one of the following matrices:

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

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

15. 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 a permutation matrix among predetermined permutation matrices according to a predetermined formula, permuting elements of the code symbol vector by mapping the coded symbol to the selected permutation matrix, and outputting the permuted code symbol vectors as grouping symbol vectors; and

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

16. The transmission method of claim 15, wherein the grouping symbol vector is one of the matrices:

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

where the four transmit antennas are represented horizontally and time is represented vertically in the matrices.

17. The transmission method of claim 15, wherein the predetermined formula is to selecting the permutation matrix one of the permutation matrices, A_k (k=1, 2 or 3) by

A_k:

k=mod(floor(logical data subcarrier number−

1)/2,

     3)+1

where the logical data subcarrier number={1, 2, 3, . . . , total number of subcarriers}.

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

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

a permutation block for permuting elements of the code symbol vector by mapping the code symbol vector to a selected permutation matrix among predetermined permutation matrices according to a predetermined formula, and outputting the permuted code symbol vector as grouping symbol vectors; and

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

19. The transmitter of claim 18, wherein the grouping symbol vector is one of the matrices:

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

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

20. The transmitter of claim 18, wherein the predetermined formula is to selecting the permutation matrix one of the permutation matrices, A_k (k=1, 2 or 3) by

A_k:

k=mod(floor(logical data subcarrier number−

1)/2,

     3)+1

where the logical data subcarrier number={1, 2, 3, . . . , total number of subcarriers}.