Reception apparatus and reception method

Patent metadata

Field	Value
Publication number	US-9847793-B2
Application number	US-201514968350-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Nov 25, 2004
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

In a multi-antenna communication system using LDPC codes, a simple method is used to effectively improve the received quality by performing a retransmittal of less data without restricting applicable LDPC codes. In a case of a non-retransmittal, a multi-antenna transmitting apparatus transmits, from two antennas, LDPC encoded data formed by LDPC encoding blocks. In a case of a retransmittal, the multi-antenna transmitting apparatus uses a transmission method, in which the diversity gain is higher than in the previous transmission, to transmit only a part of the LDPC encoded data as previously transmitted. For example, the only the part of the LDPC encoded data to be re-transmitted is transmitted from the single antenna.

First claim

The invention claimed is:

1. A reception apparatus comprising:
a receiver that receives a first reception sequence corresponding to a first encoded data sequence; and
a Low Density Parity Check (LDPC) decoder that obtains an estimated sequence of an information sequence by performing a decoding processing using the first reception sequence and a parity check matrix including a plurality of columns that are different in column weight, when the first encoded data sequence is an encoded data sequence generated by selecting from a second encoded data sequence based on column weights of the parity check matrix, the second encoded data sequence being encoded the information sequence using an encoding processing defined by the parity check matrix, wherein:
each of the column weights corresponding to the first encoded data sequence is equal to or greater than a maximum value of a column weight corresponding to a third encoded data sequence not selected from the second encoded data sequence, and
a data length of the first encoded data sequence is shorter than a data length of the second encoded data sequence.

2. The reception apparatus according to claim 1 , wherein:
the receiver further receives a third reception sequence corresponding to a fourth encoded data sequence after the receiver receives the first reception sequence; and
the LDPC decoder obtains the estimated sequence of the information sequence by performing the decoding processing using the parity check matrix and the third reception sequence, when the fourth encoded data sequence is an encoded data sequence corresponding to a same column as the column used for selecting the first encoded data sequence.

3. The reception apparatus according to claim 1 , wherein:
the receiver further receives a fourth reception sequence corresponding to a fifth encoded data sequence after the receiver receives the first reception sequence; and
the LDPC decoder obtains the estimated sequence of the information sequence by performing the decoding processing using the parity check matrix and the fourth reception sequence, when the fifth encoded data sequence is an encoded data sequence corresponding to a different column from the column used for selecting the first encoded data sequence.

4. A reception method comprising:
receiving a first reception sequence corresponding to a first encoded data sequence; and
obtaining an estimated sequence of an information sequence by performing a decoding processing using the first reception sequence and a parity check matrix including a plurality of columns that are different in column weight, when the first encoded data sequence is an encoded data sequence generated by selecting from a second encoded data sequence based on column weights of the parity check matrix, the second encoded data sequence being encoded the information sequence using an encoding processing defined by the parity check matrix, wherein:
each of the column weights corresponding to the first encoded data sequence is equal to or greater than a maximum value of a column weight corresponding to a third encoded data sequence not selected from the second encoded data sequence, and
a data length of the first encoded data sequence is shorter than a data length of the second encoded data sequence.

5. The reception method according to claim 4 , further comprising:
receiving a third reception sequence corresponding to a fourth encoded data sequence after receiving the first reception sequence; and
obtaining the estimated sequence of the information sequence by performing the decoding processing using the parity check matrix and the third reception sequence, when the fourth encoded data sequence is an encoded data sequence corresponding to a same column as the column used for selecting the first encoded data sequence.

6. The reception method according to claim 4 , further comprising:
receiving a fourth reception sequence corresponding to a fifth encoded data sequence after receiving the first reception sequence; and
obtaining the estimated sequence of the information sequence by performing the decoding processing using the parity check matrix and the fourth reception sequence, when the fifth encoded data sequence is an encoded data sequence corresponding to a different column from the column used for selecting the first encoded data sequence.

Assignees

• Panasonic Ip Corp America

Inventors

• Murakami Yutaka
• Kobayashi Kiyotaka
• Yap Choo Eng

Classifications

• H04L1/1816

  with retransmission of the same, encoded, message · CPC title

• H04L1/1893

  Physical mapping arrangements (physical resource mapping in general H04L5/00) · CPC title

• H03M13/1102

  Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes · CPC title

• H04L1/0045

  Arrangements at the receiver end · CPC title

• H04L1/0061

  Error detection codes · CPC title