Apparatus and method for space-time-frequency block coding for increasing performance

• US 20060039500A1
• Filed: 08/17/2005
• Published: 02/23/2006
• Est. Priority Date: 08/17/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Dong-Seek, Kim, Jae-Yoel, Jeong, Hong-Sil, Chae, Chan-Byoung, Ko, Kyun-Byoung, Oh, Jeong-Tae, Yun, Sung-Ryul, Roh, Won-Il
• Granted Patent: US 7,508,880 B2
• Time in Patent Office: Days
• US Class Current: 375/299
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0631 Receiver arrangements
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 1/0681 adapting space time parameters, i.e. modifying the space time matrix

Abstract

A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according to a permutation method using a selected transmission matrix in order to improve the performance of an STFBC.

Claims

1. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, comprising:

a pre-coder for pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by e^jθ

, θ

being a phase rotation angle, and outputting pre-coded symbols; and

a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order, mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas,

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

where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier.

2. The transmitter of claim 1, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC and transmitting the mapped symbols through the transmit antennas.

3. The transmitter of claim 1, wherein the permutation matrix is given by

A_k:

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers.

4. The transmitter of claim 1, wherein the permutation matrix is

5. The transmitter of claim 2, wherein the permutation matrix is

6. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, comprising:

a pre-coder for pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by e^jθ

, θ

being a phase rotation angle, and outputting pre-coded symbols; and

a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by

A_k;

k=mod(floor((index of logical data subcarrier−

1)/2),3)+1

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas,

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

7. The transmitter of claim 6, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas.

8. The transmitter of claim 6, wherein the permutation matrix is

9. The transmitter of claim 7, wherein the permutation matrix is

10. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, comprising:

a pre-coder for pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols; and

a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order, mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas,

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

where a row represents symbols for corresponding a antenna and column represents symbols mapped with a subcarrier.

11. The transmitter of claim 10, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC and transmitting the mapped symbols through the transmit antennas.

12. The transmitter of claim 10, wherein the permutation matrix is given by

A_k:

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers.

13. The transmitter of claim 10, wherein the permutation matrix is

14. The transmitter of claim 11, wherein the permutation matrix is

15. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, comprising:

a pre-coder for pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols; and

a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by

A_k;

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas,

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

16. The transmitter of claim 15, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas.

17. The transmitter of claim 15, wherein the permutation matrix is

18. The transmitter of claim 16, wherein the permutation matrix is

19. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, comprising the steps of:

pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by e^jθ

, θ

being a phase rotation angle, and outputting pre-coded symbols;

selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order;

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and

transmitting the mapped symbols through the transmit antennas,

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

20. The method of claim 19, wherein the permutation matrix is given by

A_k:

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers.

21. The method of claim 19, wherein the permutation matrix is

22. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, comprising the steps of:

pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by e^jθ

, θ

being a phase rotation angle, and outputting pre-coded symbols;

selecting an STFBC using a permutation matrix calculated;

A_k;

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and

transmitting the mapped symbols through the transmit antennas, where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

23. The method of claim 22, wherein the permutation matrix is

24. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, comprising the steps of:

pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols;

selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order;

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and

transmitting the mapped symbols through the transmit antennas,

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

25. The method of claim 24, wherein the permutation matrix is given by

A_k:

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers.

26. The method of claim 24, wherein the permutation matrix is

27. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, comprising the steps of:

pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols;

selecting an STFBC using a permutation matrix calculated by;

A_k;

k=mod(floor((index of logical data subcarrier−

1)/2),

     3)+1

mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and

transmitting the mapped symbols through the transmit antennas, where A_k(A₁=A, A₂=B, A₃=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are

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

where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier.

28. The method of claim 27, wherein the permutation matrix is