Apparatus and method for transmitting/receiving data in communication system

• US 8,615,023 B2
• Filed: 10/27/2011
• Issued: 12/24/2013
• Est. Priority Date: 10/27/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Oh, Jong-Ee, Lee, Sok-Kyu, Cheong, Min-Ho, Choi, Jee-Yon, Park, Jae-Woo, Chung, Hyun-Kyu
• Primary Examiner(s): WILSON, ROBERT W
• Application Number:
  US13/283,497
• Publication Number:
  US 20120106575A1
• Time in Patent Office: 789 Days
• Field of Search: None
• US Class Current: 370/474
• CPC Class Codes: H03M 13/1102 Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
• CPC Class Codes: H03M 13/23 using convolutional codes, e.g. unit memory codes
• CPC Class Codes: H03M 13/6527 IEEE 802.11 [WLAN]
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control

Abstract

Disclosed is an apparatus and method for transmitting/receiving data using a low-density parity check (LDPC) coding scheme in a communication system. The method includes generating a multi-user data packet containing data to be transmitted to a plurality of users, encoding the multi-user data packet as a BCC and an LDPC code, and transmitting the encoded multi-user data packet to the plurality of users. In the method, the encoding of the multi-user data packet encodes MPDU subframes corresponding to each of the plurality of users in the multi-user data packet as the LDPC code, and calculates information on a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code.

Claims

1. An apparatus for transmitting data in a communication system, the apparatus comprising:

a generation unit configured to generate, using a processor, a multi-user data packet including data to be transmitted to a plurality of users, the multi-user data packet including a plurality of medium access control (MAC) protocol data unit (MPDU) subframes, the plurality of MPDU subframes corresponding to the plurality of users;

an encoding unit configured to encode, using a processor, the multi-user data packet as a binary convolutional code (BCC) and a low-density parity check (LDPC) code; and

a transmission unit configured to transmit the encoded multi-user data packet to the plurality of the users,

wherein the encoding unit performs LDPC encoding on the multi-user data packet, and then performs BCC encoding on the LDPC encoded multi-user data packet, and

wherein the encoding unit encodes a MPDU subframe in the multi-user data packet, which corresponds to one of the plurality of users, as the LDPC code.

2. The apparatus of claim 1, wherein the transmission unit transmits information on a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code.

3. The apparatus of claim 2, wherein the encoding unit calculates a maximum value of the BCC and a maximum value of the LDPC code among the plurality of users and then determines a total number of symbols of the multi-user data packet among the maximum values, and calculates a length of a PHY (physical) service data unit (PSDU) based on the total number of symbols of the multi-user data packet.

4. The apparatus of claim 3, wherein the encoding unit calculates a length of the PSDU according to whether or not an extra symbol is used in the LDPC encoding.

5. The apparatus of claim 2, wherein the encoding unit calculates a number of available bits of orthogonal frequency division multiplexing (OFDM) symbols for each of the plurality of users in the multi-user data packet, and calculates a number of data pad bits for each of the plurality of users in the multi-user data packet.

6. The apparatus of claim 5, wherein the encoding unit calculates an integer number of a codeword of the LDPC code and a length of the codeword for each of the plurality of users in the multi-user data packet.

7. The apparatus of claim 6, wherein the encoding unit calculates a number of shortening bits for each of the plurality of users in the multi-user data packet, based on the number of data pad bits, the integer number of the codeword, and the length of the codeword.

8. The apparatus of claim 7, wherein the encoding unit calculates a number of puncturing bits for each of the plurality of users in the multi-user data packet, based on the number of data pad bits, the integer number of the codeword, the length of the codeword, and the number of shortening bits.

9. The apparatus of claim 6, wherein the encoding unit calculates a number of repeated codeword bits for each of the users in the multi-user data packet, based on the number of available bits, the integer number of the codeword, the length of the codeword, and the number of data pad bits.

10. An apparatus for receiving data in a communication system, the apparatus comprising:

a reception unit configured to receive a multi-user data packet including data to be transmitted to a plurality of users;

a decoding unit configured to decode, using a processor, the multi-user data packet, the multi-user data packet corresponding to a BCC and an LDPC code; and

a recovery unit configured to recover, using a processor, the decoded multi-user data packet to data corresponding to the plurality of users,

wherein the decoding unit performs BCC decoding on the multi-user data packet, and then performs LDPC decoding on the BCC decoded multi-user data packet

wherein the decoding unit decodes the multi-user data packet in which an MPDU subframe corresponding to one of the plurality of users is encoded as the LDPC code.

11. The apparatus of claim 10, wherein the decoding unit decodes the multi-user data packet using information on a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code.

12. A method for transmitting data in a communication system, the method comprising:

generating a multi-user data packet including data to be transmitted to a plurality of users, the multi-user data packet including a plurality of MPDU subframes, the plurality of MPDU subframes corresponding to the plurality of users;

encoding the multi-user data packet as a BCC and an LDPC code; and

transmitting the encoded multi-user data packet to the plurality of users,

wherein said encoding of the multi-user data packet comprises;

performing LDPC encoding on the multi-user data packet; and

performing BCC encoding on the LDPC encoded multi-user data packet, and

wherein said encoding of the multi-user data packet comprises encoding an MPDU subframe in the multi-user data packet that corresponds to one of the plurality of users, as the LDPC code, and calculating information on a length in the LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code.

13. The method of claim 12, wherein said encoding of the multi-user data packet comprises:

calculating a maximum value of the BCC and a maximum value of the LDPC code among the plurality of users and then determining a total number of symbols of the multi-user data packet among the maximum values; and

calculating a length of a PSDU based on the total number of symbols of the multi-user data packet.

14. The method of claim 13, wherein said encoding of the multi-user data packet comprises calculating the length of the PSDU according to whether or not an extra symbol is used in the LDPC encoding.

15. The method of claim 12, wherein said encoding of the multi-user data packet comprises:

calculating a number of available bits of OFDM symbols for each of the plurality of users in the multi-user data packet; and

calculating a number of data pad bits for each of the plurality of users, in the multi-user data packet.

16. The method of claim 15, wherein said encoding of the multi-user data packet comprises calculating an integer number of a codeword of the LDPC code and a length of the codeword for each of the plurality of users, in the multi-user data packet.

17. The method of claim 16, wherein said encoding of the multi-user data packet comprises calculating a number of shortening bits for each of plurality of users in the multi-user data packet, based on the number of data pad bits, the integer number of the codeword, and the length of the codeword.

18. The method of claim 17, wherein said encoding of the multi-user data packet comprises calculating a number of puncturing bits for each of the plurality of users in the multi-user data packet, based on the number of data pad bits, the integer number of the codeword, the length of the codeword, and the number of shortening bits.

19. The method of claim 16, wherein said encoding of the multi-user data packet comprises calculating a number of repeated codeword bits for each of plurality of users in the multi-user data packet, based on the number of available bits, the integer number of the codeword, the length of the codeword, and the number of data pad bits.

20. A method for receiving data in a communication system, the method comprising:

receiving a multi-user data packet including data to be transmitted to a plurality of users;

decoding the multi-user data packet, corresponding to a BCC and an LDPC code; and

recovering the decoded multi-user data packet to data corresponding to the plurality of users,

wherein said decoding of the multi-user data packet comprises;

performing BCC decoding on the multi-user data packet; and

performing LDPC decoding on the BCC decoded multi-user data packet,

and

wherein said decoding of the multi-user data packet comprises decoding the multi-user data packet in which an MPDU subframe corresponding to each one of the plurality of users are encoded as the LDPC code, using information on a length in the LDPC encoding corresponding to the encoding of the multi-user data packet as the LDPC code.