METHOD AND SYSTEM FOR DATA TRANSMISSION IN A MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) SYSTEM

• US 20100077275A1
• Filed: 10/10/2006
• Published: 03/25/2010
• Est. Priority Date: 10/18/2006
• Status: Active Grant

• Current Assignee: Panasonic Holdings Corporation
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yu, Qian, Hoshino, Masayuki, Luo, Ping
• Granted Patent: US 8,464,120 B2
• Time in Patent Office: Days
• US Class Current: 714/752
• CPC Class Codes: H03M 13/114 Shuffled, staggered, layered or turbo decoding schedules
• CPC Class Codes: H03M 13/116 Quasi-cyclic LDPC [QC-LDPC] codes, i.e. the parity-check matrix being composed of permutation or circulant sub-matrices
• CPC Class Codes: H03M 13/118 Parity check matrix structured for simplifying encoding, e.g. by having a triangular or an approximate triangular structure H03M13/1165 takes precedence
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04B 7/068 using space frequency diversity space-frequency coding H04L1/0606
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0625 Transmitter arrangements

Abstract

A method for data transmission in a multiple input multiple output (MIMO) system, the method including, receiving multiple input data streams; performing low density parity check (LDPC) encoding of the input data streams utilising a parity check matrix, the parity check matrix including a plurality of sub-parity check matrices for encoding respective ones of the input data streams; and performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas.

Claims

1. A method for data transmission in a multiple input multiple output (MIMO) system, the method comprising,

receiving multiple input data streams;

performing low density parity check (LDPC) encoding of the input data streams utilising a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for encoding respective ones of the input data streams; and

performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas.

2. The method as claimed in claim 1, wherein the step of performing the LDPC encoding comprises unbalanced lifting of the parity check matrix prior to encoding the input data streams utilising the parity check matrix.

3. The method as claimed in claim 2, wherein the unbalanced lifting of the parity check matrix comprises replacing elements of the sub-parity check matrices based on a replacement mapping pattern.

4. The method as claimed in claim 3, wherein the elements are replaced by a sub-matrix.

5. The method as claimed in claim 3, wherein the elements are replaced based on a value of the elements and a location of the elements in the sub-parity check matrices.

6. The method as claimed in claim 2, wherein the unbalanced lifting comprises controlling a row degree, a column degree or both of each of the sub-parity check matrix.

7. The method as claimed in claim 1, wherein the multiple input data streams comprise M input streams of M different classes, and the parity check matrix has M layers, each layer of the parity check matrix corresponding to one of the M classes.

8. The method as claimed in claim 7, wherein the parity check matrix further comprises a plurality of connection matrices, each connection matrix linking two of the M layers such that correlation information between the two layers is included during the LDPC encoding.

9. The method as claimed in claim 8, wherein the parity check matrix is a block-wise low triangular matrix, with the sub-parity check matrices located as blocks along a main diagonal of the parity check matrix.

10. The method as claimed in claim 9, wherein the connection matrices are located as blocks below the main diagonal of the parity check matrix, with blocks above the main diagonal being zero matrices.

11. The method as claimed in claim 7, wherein each class is determined based on one or more of a group consisting of bit error rates, data transmission rates, quality of service (QoS) requirements, number of transmission antennas and transmission conditions.

12. A transmitter in a multiple input multiple output (MIMO) system, the transmitter comprising,

one or more input units for receiving multiple input data streams;

a low density parity check (LDPC) encoder; and

a spatial mapping unit;

wherein the LDPC encoder performs LDPC encoding of the input data streams utilising a parity check matrix and the parity check matrix comprises a plurality of sub-parity check matrices for encoding respective ones of the input data streams and the spatial mapping unit performs space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas.

13. The transmitter as claimed in claim 12, wherein the LDPC encoder performs unbalanced lifting of the parity check matrix prior to encoding the input data streams utilising the parity check matrix.

14. The transmitter as claimed in claim 13, wherein the unbalanced lifting of the parity check matrix comprises replacing elements of the sub-parity check matrices based on a replacement mapping pattern.

15. The transmitter as claimed in claim 14, wherein the LDPC encoder replaces the elements with a sub-matrix.

16. The transmitter as claimed in claim 14, wherein the LDPC encoder replaces the elements based on a value of the elements and a location of the elements in the sub-parity check matrices.

17. The transmitter as claimed in claim 13, wherein the unbalanced lifting comprises controlling a row degree, a column degree or both of each of the sub-parity check matrix.

18. The transmitter as claimed in claim 12, wherein the multiple input data streams comprises M input streams of M different classes, and the parity check matrix has M layers, each layer of the parity check matrix corresponding to one of the M classes.

19. The transmitter as claimed in claim 18, wherein the parity check matrix further comprises a plurality of connection matrices, each connection matrix linking two of the M layers such that correlation information between the two layers is included during the LDPC encoding.

20. The transmitter as claimed in claim 19, wherein the parity check matrix is a block-wise low triangular matrix, with the sub-parity check matrices located as blocks along a main diagonal of the parity check matrix.

21. The transmitter as claimed in claim 20, wherein the connection matrices are located as blocks below the main diagonal of the parity check matrix, with blocks above the main diagonal being zero matrices.

22. The transmitter as claimed in claim 18, wherein each class is determined based on one or more of a group consisting of bit error rates, data transmission rates, quality of service (QoS) requirements, number of transmission antennas and transmission conditions.

23. A computer readable data storage medium having stored thereon computer code means for instructing a multiple input multiple output (MIMO) system to execute a method for data transmission in the MIMO system, the method comprising:

receiving multiple input data streams;

performing low density parity check (LDPC) encoding of the input data streams utilising a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for encoding respective ones of the input data streams; and

performing space time encoding for transmitting the LDPC encoded input data streams over a plurality of antennas.

24. A method for processing received data streams in a multiple input multiple output (MIMO) system, the method comprising,

receiving data streams via a plurality of receive antennas;

performing space time decoding on the received data streams; and

performing low density parity check (LDPC) decoding of the received data streams utilising a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for decoding the data streams.

25. The method as claimed in claim 24, further comprising using a sum-product method for decoding the received data streams.

26. A receiver in a multiple input multiple output (MIMO) system, the receiver comprising,

a plurality of receive antennas for receiving data streams;

a spatial mapping decoder for performing space time decoding on the received data streams; and

a low density parity check (LDPC) decoder for decoding the received data streams utilising a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for decoding the data streams.

27. The receiver as claimed in claim 26, wherein the LDPC decoder comprises one or more sum-product decoders.

28. A computer readable data storage medium having stored thereon computer code means for instructing a multiple input multiple output (MIMO) system to execute a method for processing received data streams in the MIMO system, the method comprising:

receiving data streams via a plurality of receive antennas;

performing space time decoding on the received data streams; and

performing low density parity check (LDPC) decoding of the received data streams utilising a parity check matrix, wherein the parity check matrix comprises a plurality of sub-parity check matrices for decoding the data streams.