Method and system for unequal error protection with block codes for wireless transmission

• US 20090086699A1
• Filed: 10/02/2007
• Published: 04/02/2009
• Est. Priority Date: 10/02/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Niu, Huaning, Ngo, Chiu
• Granted Patent: US 7,889,707 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• 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 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end

Abstract

A method and system for wireless data communication is provided, which involves constructing a data payload containing data, partitioning the data payload into fragments, performing block code encoding on each fragment, wherein at least one fragment is encoded at a different coding gain than another fragment, and transmitting the data payload including encoded fragments over a wireless channel.

Claims

1. A method of wireless data communication, comprising the steps of:

constructing a data payload by partitioning the data into multiple fragments;

performing block code encoding on each fragment, wherein at least one fragment is encoded at a different coding gain than another fragment; and

transmitting the data payload over a wireless channel.

2. The method of claim 1, wherein constructing the data payload containing the data further includes appending a Media Access Control (MAC) header to the data payload to generate a MAC packet.

3. The method of claim 2, wherein:

partitioning the data further includes partitioning the data into multiple fragments based on certain criteria; and

performing block code encoding further includes performing low-density parity-check (LDPC) encoding on each fragment at a coding gain that is based on said criteria.

4. The method of claim 3, wherein:

partitioning the data payload into fragments further includes partitioning the data payload based on multiple data importance levels; and

performing LDPC encoding further includes performing LDPC encoding on each fragment at a coding gain that is based on the importance level of the data in that fragment, wherein more important data is provided with more error protection.

5. The method of claim 4, wherein:

the data comprises video pixels;

partitioning the data further includes partitioning the data based on the video importance level of the bits in each pixel component; and

performing LDPC encoding further includes performing LDPC encoding on each fragment at a coding gain that is based on the importance level of the data in that fragment, wherein more important video bits are provided with more error protection.

6. The method of claim 5, wherein:

partitioning the data further includes partitioning the data based on the video importance level of the bits in each pixel component, such that the MSBs are placed in different fragments than the LSBs; and

performing LDPC encoding further includes performing LDPC encoding on each fragment that contains the MSBs at a coding gain that is higher than that of each fragment that contains the LSBs, wherein the MSBs are provided with more error protection.

7. The method of claim 5 wherein:

transmitting the data payload further includes appending a PHY (physical) header to the MAC packet to generate a data unit frame for transmission over a wireless channel; and

transmitting the payload further includes transmitting the data unit frame by directional transmission beams over a high-rate wireless channel.

8. The method of claim 1, wherein the payload comprises a MAC Service Data Unit (MSDU).

9. The method of claim 8, wherein the data unit frame comprises a PHY Protocol Data Unit (PPDU).

10. The method of claim 1, wherein transmitting the data payload includes transmitting the data payload including encoded fragments over a 60 GHz wireless channel.

11. The method of claim 1, further including the step of selectively retransmitting data in said encoded fragments, indicated as received in error by a receiver.

12. A method of wireless data communication, comprising the steps of:

receiving a data payload comprising block code encoded data fragments over a wireless channel, wherein at least one fragment is encoded at a different coding gain than another fragment;

performing block code decoding on the data fragments in the data payload to detect data received in error; and

performing selective retransmission of the data received in error over a wireless channel.

13. The method of claim 12, wherein performing decoding further includes performing iterative decoding.

14. The method of claim 12, wherein performing selective retransmission further includes:

generating acknowledgement information that identifies the data received in error; and

transmitting the acknowledgment information over a wireless channel.

15. The method of claim 14 further comprising the steps of:

receiving the acknowledgment information; and

selectively retransmitting only the data identified in the acknowledgment information as received in error.

16. The method of claim 12, wherein receiving the data payload includes receiving a data payload comprising LDPC encoded data fragments over a 60 GHz wireless channel.

17. A wireless transmitter, comprising:

a framing module configured for constructing a data payload by partitioning the data into multiple fragments;

an encoder configured for performing block code encoding on each fragment, wherein at least one fragment is encoded at a different coding gain than another fragment; and

a communication module configured for transmitting the data payload over a wireless channel.

18. The wireless transmitter of claim 17, wherein the framing module is further configured for appending a Media Access Control (MAC) header to the data payload to generate a MAC packet.

19. The wireless transmitter of claim 18, wherein:

the framing module is further configured for partitioning the data into multiple fragments based on certain criteria; and

the encoder is further configured for performing block code encoding on each fragment at a coding gain that is based on said criteria.

20. The wireless transmitter of claim 19, wherein:

the framing module is further configured for partitioning the data payload based on multiple data importance levels; and

the encoder is further configured for performing block code encoding on each fragment at a coding gain that is based on the importance level of the data in that fragment, wherein more important data is provided with more error protection.

21. The wireless transmitter of claim 20, wherein:

the data comprises video pixels;

the framing module is further configured for partitioning the data based on video importance level of the bits in each pixel component; and

the encoder is further configured for performing LDPC encoding on each fragment at a coding gain that is based on the importance level of the data in that fragment, wherein more important video bits are provided with more error protection.

22. The wireless transmitter of claim 21, wherein:

the framing module is further configured for partitioning the data based on the video importance level of the bits in each pixel component, such that the MSBs are placed in different fragments than the LSBs; and

the encoding module is further configured for performing LDPC encoding on each fragment that contains the MSBs at a coding gain that is higher than that of each fragment that contains the LSBs, wherein the MSBs are provided with more error protection.

23. The wireless transmitter of claim 21, wherein the communication module is further configured for appending a PHY (physical) header to the MAC packet to generate a data unit frame for transmission over a wireless channel, and transmitting the data unit frame by directional transmission beams over a high-rate wireless channel.

24. The wireless transmitter of claim 17, wherein the payload comprises a MAC Service Data Unit (MSDU).

25. The wireless transmitter of claim 24, wherein the data unit frame comprises a PHY Protocol Data Unit (PPDU).

26. The wireless transmitter of claim 17, wherein the communication module is configured for transmitting the data payload, including encoded fragments over a 60 GHz wireless channel.

27. The wireless transmitter of claim 17 further including a retransmission module configured for selectively re-transmitting data in said encoded fragments, indicated as received in error by a receiver.

28. A wireless receiver, comprising:

a communication module configured for receiving a data payload comprising block code encoded data fragments over a wireless channel, wherein at least one fragment is encoded at a different coding gain than another fragment;

a decoder configured for performing block code decoding on the data fragments in the data payload to detect data received in error; and

an acknowledgment module configured for requesting selective retransmission of the data received in error over a wireless channel.

29. The wireless receiver of claim 28, wherein the decoder is further configured for performing decoding by iterative decoding.

30. The wireless receiver of claim 28, wherein the acknowledgment module is further configured for generating acknowledgement information that identifies the data received in error, and transmitting the acknowledgment information over a wireless channel.

31. The wireless receiver of claim 28, wherein receiving the data payload includes receiving the data payload over a 60 GHz wireless channel.

32. The wireless receiver of claim 28, wherein the data is partitioned into multiple fragments based on certain criteria and each fragment is LDPC encoded at a coding gain that is based on said criteria.

33. The wireless receiver of claim 32, wherein the data is partitioned into fragments based on multiple data importance levels and each fragment is LDPC encoded at a coding gain that is based on the importance level of the data in that fragment, wherein more important data is provided with more error protection.