Methods and apparatus for dynamic packet reordering

• US 20070230632A1
• Filed: 04/04/2006
• Published: 10/04/2007
• Est. Priority Date: 04/04/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Bai, Jinxia, Sun, Thomas, Ganapathy, Chinnappa
• Granted Patent: US 8,213,548 B2
• Time in Patent Office: Days
• US Class Current: 375/341
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 25/067 providing soft decisions, i.e. decisions together with an estimate of reliability H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

Methods and apparatus for dynamic packet reordering. In an aspect, a method is provided for processing slot data on-the-fly to produce decodable packets, wherein the slot data includes interleaved modulation symbols. The method includes de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols, calculating parallel streams of LLR metrics based on the stream of modulation symbols, and mapping the parallel streams of LLR metrics to produce a stream of decodable packets. In another aspect, an apparatus is provided the includes de-interleaving logic to de-interleave a stream of interleaved modulation symbols to produce a stream of modulation symbols, metric processing logic configured to produce parallel streams of LLR metrics based on the stream of modulation symbols, and mapping logic configured to map the parallel streams of LLR metrics to produce a stream of decodable packets.

Claims

1. A method for processing slot data on-the-fly to produce decodable packets, wherein the slot data comprises interleaved modulation symbols, the method comprising:

de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols;

calculating parallel streams of LLR metrics based on the stream of modulation symbols; and

mapping the parallel streams of LLR metrics to produce a stream of decodable packets.

2. The method of claim 1, wherein said calculating comprises:

calculating parallel streams of scrambled LLR metrics based on the stream of modulation symbols;

descrambling the parallel streams of scrambled LLR metrics to produce parallel streams of interleaved LLR metrics; and

de-interleaving the parallel streams of interleaved LLR metrics to produce the parallel streams of LLR metrics.

3. The method of claim 2, further comprising calculating the parallel streams of scrambled LLR metrics using a channel estimation parameter.

4. The method of claim 2, further comprising descrambling the parallel streams of scrambled LLR metrics using a pseudorandom sequence.

5. The method of claim 2, further comprising de-interleaving the parallel streams of interleaved LLR metrics using a de-interleaving table.

6. The method of claim 1, further comprising mapping the parallel streams of LLR metrics using a packet buffer.

7. The method of claim 1, further comprising receiving the interleaved modulation symbols in an OFDM transmission frame.

8. Apparatus for processing slot data on-the-fly to produce decodable packets, wherein the slot data comprises interleaved modulation symbols, the apparatus comprising:

de-interleaving logic configured to de-interleave a stream of the interleaved modulation symbols to produce a stream of modulation symbols;

metric processing logic configured to produce parallel streams of LLR metrics based on the stream of modulation symbols; and

mapping logic configured to map the parallel streams of LLR metrics to produce a stream of decodable packets.

9. The apparatus of claim 8, wherein said metric processing logic comprises:

calculation logic configured to calculate parallel streams of scrambled LLR metrics based on the stream of modulation symbols;

descrambling logic configured to descramble the parallel streams of scrambled LLR metrics to produce parallel streams of interleaved LLR metrics; and

de-interleaving logic configured to de-interleave the parallel streams of interleaved LLR metrics to produce the parallel streams of LLR metrics.

10. The apparatus of claim 9, wherein said calculating logic is configured to calculate the parallel streams of scrambled LLR metrics using a channel estimation parameter.

11. The apparatus of claim 9, wherein said descrambling logic is configured to descramble the parallel streams of scrambled LLR metrics using a pseudorandom sequence.

12. The apparatus of claim 9, wherein said de-interleaving logic is configured to de-interleave the parallel streams of interleaved LLR metrics using a de-interleaving table.

13. The apparatus of claim 8, wherein said mapping logic is configured to map the parallel streams of LLR metrics using a packet buffer.

14. The apparatus of claim 8, further comprising receiving logic configured to receive the interleaved modulation symbols in an OFDM transmission frame.

15. Apparatus for processing slot data on-the-fly to produce decodable packets, wherein the slot data comprises interleaved modulation symbols, the apparatus comprising:

means for de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols;

means for calculating parallel streams of LLR metrics based on the stream of modulation symbols; and

means for mapping the parallel streams of LLR metrics to produce a stream of decodable packets.

16. The apparatus of claim 15, wherein said calculating comprises:

means for calculating parallel streams of scrambled LLR metrics based on the stream of modulation symbols;

means for descrambling the parallel streams of scrambled LLR metrics to produce parallel streams of interleaved LLR metrics; and

means for de-interleaving the parallel streams of interleaved LLR metrics to produce the parallel streams of LLR metrics.

17. The apparatus of claim 16, further comprising means for calculating the parallel streams of scrambled LLR metrics using a channel estimation parameter.

18. The apparatus of claim 16, further comprising means for descrambling the parallel streams of scrambled LLR metrics using a pseudorandom sequence.

19. The apparatus of claim 16, further comprising means for de-interleaving the parallel streams of interleaved LLR metrics using a de-interleaving table.

20. The apparatus of claim 15, further comprising means for mapping the parallel streams of LLR metrics using a packet buffer.

21. The apparatus of claim 15, further comprising means for receiving the interleaved modulation symbols in an OFDM transmission frame.

22. A computer-readable medium comprises a computer program, which when executed by at least one processor, operates to process slot data on-the-fly to produce decodable packets, wherein the slot data comprises interleaved modulation symbols, the computer program comprising:

instructions for de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols;

instructions for calculating parallel streams of LLR metrics based on the stream of modulation symbols; and

instructions for mapping the parallel streams of LLR metrics to produce a stream of decodable packets.

23. The computer program of claim 22, wherein said calculating comprises:

instructions for calculating parallel streams of scrambled LLR metrics based on the stream of modulation symbols;

instructions for descrambling the parallel streams of scrambled LLR metrics to produce parallel streams of interleaved LLR metrics; and

instructions for de-interleaving the parallel streams of interleaved LLR metrics to produce the parallel streams of LLR metrics.

24. The computer program of claim 23, further comprising instructions for calculating the parallel streams of scrambled LLR metrics using a channel estimation parameter.

25. The computer program of claim 23, further comprising instructions for descrambling the parallel streams of scrambled LLR metrics using a pseudorandom sequence.

26. The computer program of claim 23, further comprising instructions for de-interleaving the parallel streams of interleaved LLR metrics using a de-interleaving table.

27. The computer program of claim 22, further comprising instructions for mapping the parallel streams of LLR metrics using a packet buffer.

28. The computer program of claim 22, further comprising instructions for receiving the interleaved modulation symbols in an OFDM transmission frame.

29. At least one processor configured to perform a method for processing slot data on-the-fly to produce decodable packets, wherein the slot data comprises interleaved modulation symbols, the method comprising:

de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols;

calculating parallel streams of LLR metrics based on the stream of modulation symbols; and

mapping the parallel streams of LLR metrics to produce a stream of decodable packets.

30. The method of claim 29, wherein said calculating comprises:

calculating parallel streams of scrambled LLR metrics based on the stream of modulation symbols;

descrambling the parallel streams of scrambled LLR metrics to produce parallel streams of interleaved LLR metrics; and

de-interleaving the parallel streams of interleaved LLR metrics to produce the parallel streams of LLR metrics.

31. The method of claim 30, further comprising calculating the parallel streams of scrambled LLR metrics using a channel estimation parameter.

32. The method of claim 30, further comprising descrambling the parallel streams of scrambled LLR metrics using a pseudorandom sequence.

33. The method of claim 30, further comprising de-interleaving the parallel streams of interleaved LLR metrics using a de-interleaving table.

34. The method of claim 29, further comprising mapping the parallel streams of LLR metrics using a packet buffer.

35. The method of claim 29, further comprising receiving the interleaved modulation symbols in an OFDM transmission frame.