SOFT DECISION DECODING METHOD AND SYSTEM THEREOF

• US 20160182093A1
• Filed: 07/31/2014
• Published: 06/23/2016
• Est. Priority Date: 08/29/2013
• Status: Active Grant

• Current Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Guoxia Zhang, Qingshan Zhang, Zeng Yang
• Inventors: YANG, Zeng, ZHANG, Qingshan, ZHANG, Guoxia
• Granted Patent: US 10,491,246 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03M 13/3994 using state pinning or decision forcing, i.e. the decoded sequence is forced through a particular trellis state or a particular set of trellis states or a particular decoded symbol
• CPC Class Codes: H03M 13/4138 soft-output Viterbi algorithm based decoding, i.e. Viterbi decoding with weighted decisions
• CPC Class Codes: H03M 13/45 Soft decoding, i.e. using symbol reliability information H03M13/41 takes precedence
• CPC Class Codes: H03M 13/6527 IEEE 802.11 [WLAN]
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

Method and system for soft decision decoding are provided. A soft decision decoding method implemented by a receiver in a communication network may include: receiving a signal frame carrying a message through a communication network; obtaining data structure of the message; obtaining at least one bit of the message based on the data structure and known information; and decoding the received signal frame based on the at least one bit using soft decision decoding to obtain a decoding result. Decoding efficiency and accuracy may be improved.

Claims

1. A method for decoding data, comprising:

receiving a signal frame carrying a message through a communication network;

obtaining data structure associated with the message;

obtaining at least one bit of the message based on the data structure; and

decoding the received signal frame based on the at least one bit using soft decision decoding to obtain a decoding result.

2. The method according to claim 1, wherein the data structure is obtained based on the length of the signal frame.

3. The method according to claim 1, wherein the data structure is obtained based on control information associated with the message.

4. The method according to claim 1, wherein the communication network is an IEEE 802.11p network, and obtaining the data structure associated with the message comprises:

obtaining a physical layer convergence protocol (PLCP) header corresponding to the message;

determining a message type associated with the message based on control information associated with the message contained in the PLCP header; and

obtaining the data structure associated with the message based on the message type.

5. The method according to claim 4, wherein determining the message type comprises:

determining that the PLCP header comprises information directly indicating the message type; and

determining the message type based on the information directly indicating the message type.

6. The method according to claim 1, wherein, if the data structure associated with the message indicates that the message is a basic safety message (BSM), then the at least one bit comprises positioning data associated with a receiver.

7. The method according to claim 1, wherein, if the data structure associated with the message indicates that the message is a BSM, then the at least one bit comprises at least one of bits representing positioning data associated with a of the receiver, sub-network access protocol (SNAP) header data, and logical link control (LLC) header date in a medium access control (MAC) layer of the receiver.

8. The method according to claim 1, wherein decoding the received signal frame based on the at least one bit using soft decision decoding comprises:

generating an priori sequence that includes N likelihood ratios, wherein each likelihood ratio corresponds to one bit of the message, and wherein likelihood ratios corresponding to the at least one bit are set according to the at least one bit; and

decoding the received signal frame based on the priori sequence using soft decision decoding.

9. The method according to claim 8, wherein the priori sequence comprises a log likelihood ratio (LLR) sequence.

10. The method according to claim 1, further comprising transmitting the decoding result to an application layer.

11. A soft decision decoding system implemented in a receiver, the system comprising:

a transceiver configured to receive a signal frame carrying a message through a communication network; and

a processing device configured to;

obtain a data structure associated with the message;

obtain at least one bit of the message based on the data structure and

decode the signal frame based on the at least one bit using soft decision decoding to obtain a decoding result.

12. The soft decision decoding system according to claim 11, wherein the processing device is configured to obtain the data structure based on the length of the signal frame.

13. The soft decision decoding system according to claim 11, wherein the processing device is configured to obtain the data structure based on control information associated with the message.

14. The soft decision decoding system according to claim 11, wherein the communication network is an IEEE 802.11p network, and the processing device is configured to obtain the data structure by:

obtaining a physical layer convergence protocol (PLCP) header corresponding to the message;

determining a message type associated with the message based on control information associated with the message contained in the PLCP header; and

obtaining the data structure associated with the message based on the message type.

15. The soft decision decoding system according to claim 14, wherein the processing device is configured to determine the message type by:

determining that the PLCP header comprises information directly indicating the message type; and

determining the message type based on the information directly indicating the message type.

16. The soft decision decoding system according to claim 11, wherein, if the data structure associated with the message indicates that the message is a basic safety message (BSM), then the at least one bit comprises positioning data associated with a.

17. The soft decision decoding system according to claim 11, wherein, if the data structure associated with the message indicates that the message is a BSM, then the at least one bit comprises at least one of bits representing positioning data associated with a of the receiver, sub-network access protocol (SNAP) header data, and logical link control (LLC) header date in a medium access control (MAC) layer of the receiver.

18. The soft decision decoding system according to claim 11, wherein the processing device is configured to decode the message based on a priori sequence that comprises N likelihood ratios, wherein each likelihood ratio corresponds to one bit of the message, and wherein likelihood ratios corresponding to the at least one bit are set according to the at least one bit.

19. The soft decision decoding system according to claim 18, wherein the priori sequence comprises a log likelihood ratio (LLR) sequence.

20. The soft decision decoding system according to claim 11, wherein the processing device is configured to transmit the decoding result to an application layer.