APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM

• US 20120106575A1
• Filed: 10/27/2011
• Published: 05/03/2012
• 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
• Granted Patent: US 8,615,023 B2
• Time in Patent Office: Days
• 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 a multi-user data packet containing data to be transmitted to a plurality of users;

an encoding unit configured to encode 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 encodes medium access control (MAC) protocol data unit (MPDU) subframes corresponding to each of the plurality of users in the multi-user data packet as the LDPC code.

2. The apparatus of claim 1, wherein the transmission unit transmits information 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) through the total number of symbols of the multi-user data packet.

4. The apparatus of claim 3, wherein the encoding unit calculates the length of the PSDU, corresponding to the present of use of an extra symbol, in the encoding of the multi-user data packet as the LDPC code.

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 users in the multi-user data packet, and calculates a number of data pad bits for each of the 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 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 user in the multi-user data packet, through 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 user in the multi-user data packet, through 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 user in the multi-user data packet, through 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 containing data to be transmitted to a plurality of users;

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

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

wherein the decoding unit decodes the multi-user data packet in which MPDU subframes corresponding to each of the plurality of users are encoded as the LDPC code.

11. The apparatus of claim 10, wherein the decoding unit decodes the multi-user data packet using information 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 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,

wherein said 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.

13. The method of claim 12, wherein said encoding of the multi-user data packet 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 PSDU through 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 calculates the length of the PSDU, corresponding to the present of use of an extra symbol, in the encoding of the multi-user data packet as the LDPC code.

15. The method of claim 12, wherein said encoding of the multi-user data packet calculates a number of available bits of OFDM symbols for each of the users in the multi-user data packet, and calculates a number of data pad bits for each of the users in the multi-user data packet.

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

17. The method of claim 16, wherein said encoding of the multi-user data packet calculates a number of shortening bits for each of the user in the multi-user data packet, through 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 calculates a number of puncturing bits for each of the user in the multi-user data packet, through 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 calculates a number of repeated codeword bits for each of the user in the multi-user data packet, through 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 containing 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 decodes the multi-user data packet, in which MPDU subframes corresponding to each of the plurality of users are encoded as the LDPC code, using information a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code.