CODING A SIGNAL

• US 20090254789A1
• Filed: 08/24/2006
• Published: 10/08/2009
• Est. Priority Date: 08/24/2006
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Nokia Corporation
• Inventors: Chen, Hongyuan, Shu, Kodo
• Granted Patent: US 8,266,487 B2
• Time in Patent Office: Days
• US Class Current: 714/746
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link

Abstract

An apparatus, a base station and user equipment are provided. The apparatus is configured to code a first given number of symbols from the beginning of a transmission period and/or a second given number of symbols from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

Claims

1. A method, comprising

coding at least one of the following:

a first given number of symbols from the beginning of a transmission period,

a second given number of symbols from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

2. The method of claim 1, further comprising:

estimating the length of a first interfered period at the beginning of a transmission period and /or the length of a second interfered period at the end of a transmission period and

coding a first given number of symbols covering the duration of the first interfered period from the beginning of a transmission period and/or a second given number of symbols covering the duration of the second interfered period from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

3. The method of claim 2, further comprising:

estimating the length of a first interfering period at the beginning of a transmission period comprising one or more successive frames, and

selecting the first given number on the basis of the length of the first interfering period and the length of the symbols.

4. The method of claim 3, further comprising:

estimating the length of a second interfering period at the end of a transmission period comprising one or more successive frames, and

selecting the second given number on the basis of the length of the second interfering period and the length of the symbols.

5. The method of claim 1, further comprising:

estimating the distance between a receiver and a desired transmitter and the receiver and one or more interfering transmitters,

determining a delay variation for each connection between the receiver and the interfering transmitters on the basis of the estimated distances,

estimating a maximum clock error for each connection between the receiver and the interfering transmitters caused by clock inaccuracy between the desired transmitter and the interfering transmitters, and

estimating the first and second interfering periods on the basis of the delay variation and the maximum clock error.

6. The method of claim 5, further comprising:

estimating the first interfering period as the maximum value of a sum of the maximum clock error and the delay variation over each connection between the receiver and the interfering transmitters.

7. The method of claim 5, further comprising:

estimating the second interfering period as the maximum value of the difference of the maximum clock error and the delay variation over each connection between the receiver and the interfering transmitters.

8. The method of claim 5, further comprising:

applying the stronger error correcting code only if the distance between the receiver and the desired transmitter is larger than a given threshold.

9. The method of claim 5, further comprising:

determining a SIR estimate for receivers,

applying the stronger error correcting code only to symbols intended to receivers located farther away from the desired transmitter than a given threshold distance and having a SIR estimate below a given threshold.

10. An apparatus, configured to code at least one of the following:

a first given number of symbols from the beginning of a transmission period,

a second given number of symbols from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

11. The apparatus of claim 10, further comprising:

an estimator configured to estimate the length of a first interfered period at the beginning of a transmission period and/or the length of a second interfered period at the end of a transmission period and

a coder configured to code a first given number of symbols covering the duration of the first interfered period from the beginning of a transmission period and/or a second given number of symbols covering the duration of the second interfered period from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

12. The apparatus of claim 11, further comprising:

a coder configured to code a first given number of symbols from the beginning of a first frame in a set of successive frames and/or a second given number of symbols from the end of the last frame of the set of successive frames with a stronger error correcting code than the rest of the symbols in the set of successive frames.

13. The apparatus of claim 11, further comprising:

a controller configured to select the first given number on the basis of the length of the first interfering period and the length of the symbols.

15. The apparatus of claim 11, further comprising a controller configured to:

estimate the distance between a receiver and a desired transmitter and the receiver and one or more interfering transmitters,

determine a delay variation for each connection between the receiver and the interfering transmitters on the basis of the estimated distances,

estimate a maximum clock error for each connection between the receiver and the interfering transmitters caused by clock inaccuracy between the desired transmitter and the interfering transmitters, and

estimate the first and second interfering periods on the basis of the delay variation and the maximum clock error.

16. The apparatus of claim 11, further comprising:

a coder having as an input a signal comprising information regarding the first given number of symbols and the second given number of symbols.

14. The apparatus of claim, further comprising:

a controller configured to estimate the length of a second interfering period at the end of a transmission period comprising one or more successive frames, and

select the second given number on the basis of the length of the second interfering period and the length of the symbols.

17-22. -22. (canceled)

23. An integrated circuit, comprising:

a coder configured to code at least one of the following;

a first given number of symbols from the beginning of a transmission period,

a second given number of symbols from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

24. The integrated circuit of claim 23, further comprising:

an estimator configured to estimate the length of a first interfered period at the beginning of a transmission period and /or the length of a second interfered period at the end of a transmission period and

a coder configured to code a first given number of symbols covering the duration of the first interfered period from the beginning of a transmission period and/or a second given number of symbols covering the duration of the second interfered period from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

25. A computer program product encoding a computer program of instructions for executing a computer process for coding a signal, the signal comprising symbols, the process comprising:

coding at least one of the following;

a first given number of symbols from the beginning of a transmission period,

a second given number of symbols from the end of the transmission period with a stronger error correcting code than the rest of the symbols in the transmission period.

26-30. -30. (canceled)