Training sequence for symbol boundary detection in a multicarrier data transmission system

• US 20050276339A1
• Filed: 06/09/2004
• Published: 12/15/2005
• Est. Priority Date: 06/09/2004
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Leung, Pak Hei Matthew, Tang, Eugene Yuk-Yin, Chow, Jacky S., Luk, King-Fuk, Sands, Nicholas Philip
• Granted Patent: US 7,817,730 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 27/2691 involving interference determination or cancellation

Abstract

An improved training sequence for acquiring symbol boundary timing at a receiver of a data transmission system is disclosed. One aspect pertains to an improved training sequence wherein groups of identical symbols are transmitted by a transmitter. These symbols can be supplied to the transmitter in a time domain or a frequency domain manner. The improved training sequence facilitates symbol boundary determination at a receiver.

Claims

1. A training protocol for use in estimating symbol boundary timing at a receiver of a multicarrier data transmission system, wherein said training protocol transmits a series of training symbols over a wire to the receiver, wherein at least two of the training symbols in the series of training symbols being identical symbols that are preceded or succeeded by different training symbols.

2. A training protocol as recited in claim 1, wherein the multicarrier data transmission system is digital subscriber line system.

3. A training protocol as recited in claim 2, wherein the training symbols include at least one of a cyclic prefix and a cyclic suffix.

4. A training protocol as recited in claim 2, wherein the training symbols are Quadrature Amplitude Modulation (QAM) symbols or Phase Shift Keying (PSK) symbols.

5. A training protocol as recited in claim 2, wherein the training symbols in the frequency domain include training information on at least one subcarrier.

6. A training protocol as recited in claim 5, wherein the training symbols in the frequency domain further include non-training information on at least one other subcarrier.

7. A training protocol as recited in claim 2, wherein the training symbols in the frequency domain include training information on a first set of subcarriers and non-training information on a second set of subcarriers.

8. A training protocol as recited in claim 1, wherein the training symbols are random or pseudo-random.

9. A training protocol as recited as claim 1, wherein each pair of adjacent symbols in the series of training symbols are identical with symbols on adjacent ones of the pairs being different.

10. A training protocol as recited as claim 1, wherein the at least two identical symbols form a series of symbols, and wherein the sequence of training symbols has a plurality of series of different symbols.

11. A method for transmitting a training protocol for use in a multicarrier data transmission system to acquire a symbol timing boundary, said method comprising:

(a) obtaining a series of training symbols; and

(b) transmitting the training symbols such that at least two identical training symbols are preceded or succeeded by different training symbols.

12. A method as recited in claim 11, wherein said transmitting (b) comprises:

(b1) selecting one of the training symbols; and

(b2) transmitting the training symbol one or more times.

13. A method as recited in claim 12, wherein said transmitting (b) comprises:

(b3) repeating said selecting (b1) and said transmitting (b2) for other of the training symbols.

14. A method as recited in claim 11, wherein said transmitting (b) comprises:

(b1) selecting one of the training symbols; and

(b2) transmitting the training symbol twice in succession.

15. A method as recited in claim 11, wherein the training symbols are Quadrature Amplitude Modulation (QAM) symbols or Phase Shift Keying (PSK) symbols.

16. A method as recited in claim 15, wherein the multicarrier data transmission system is a digital subscriber line system.

17. A method as recited in claim 16, wherein the training symbols include at least one of a cyclic prefix and a cyclic suffix.

18. A method as recited in claim 11, wherein the training symbols are obtained in a random or pseudo-random manner.

19. A method as recited in claim 11, wherein the multicarrier data transmission system includes at least one recipient receiver, the recipient receiver receives received symbols based on the transmission of the training symbols whereby at least two identical training symbols are preceded or succeeded by different training symbols.

20. A method as recited in claim 11, wherein the series of training symbols being obtained (a) are time domain symbols.

21. A method as recited in claim 11, wherein the training symbols in the frequency domain include training information on at least one subcarrier.

22. A method as recited in claim 21, wherein the training symbols in the frequency domain further include non-training information on at least another subcarrier.

23. A method as recited in claim 21, wherein the training information is random or pseudo-random.

24. A method for transmitting a training protocol for use in a multicarrier data transmission system to acquire a symbol timing boundary, said method comprising:

(a) obtaining a series of training symbols;

(b) selecting a first of the training symbols from the series of training symbols;

(c) transmitting the first training symbol twice in a predetermined manner;

(d) selecting a second training symbol from the series of training symbols, the second training symbol being different than the first training symbol; and

(e) transmitting the second training symbol twice in the predetermined manner.

25. A method as recited in claim 24, wherein said method further comprises:

(f) selecting a next training symbol from the series of training symbols; and

(g) transmitting the next training symbol twice in the predetermined manner.

26. A method as recited in claim 25, wherein said method further comprises:

(h) repeating said selecting (f) and said transmitting (g) until the end of the series of training symbols.

27. A method as recited in claim 24, wherein the training symbols are Quadrature Amplitude Modulation (QAM) symbols or Phase Shift Keying (PSK) symbols.

28. A method as recited in claim 27, wherein the multicarrier data transmission system is a digital subscriber line system.

29. A method as recited in claim 28, wherein the training symbols include at least one of a cyclic prefix and a cyclic suffix.

30. A method as recited in claim 24, wherein the first training symbol is obtained in a random or pseudo-random manner, and the second training symbol is obtained in a random or pseudo-random manner.

31. A method as recited in claim 24, wherein the multicarrier data transmission system includes at least one recipient receiver, the recipient receiver receives a first pair of received symbols based on the transmission of the first training symbol twice in the predetermined manner, and the recipient receiver receives a second pair of received symbols based on the transmission of the first training symbol twice in the predetermined manner.

32. A method as recited in claim 24, wherein the series of training symbols being obtained (a) are time domain symbols.

33. A method as recited in claim 24, wherein the training symbols in the frequency domain include training information on at least one subcarrier.

34. A method as recited in claim 33, wherein the training symbols in the frequency domain further include non-training information on at least one other subcarrier.

35. A method as recited in claim 33, wherein the training information is random or pseudo-random.

36. A computer readable medium including at least computer program code for transmitting a training protocol for use in a data transmission system to acquire a symbol timing boundary, said computer readable medium comprising:

computer program code for obtaining a series of training symbols; and

computer program code for transmitting the training symbols such that at least two identical training symbols are preceded or succeeded by different training symbols.