Claims
- 1. A method comprising the steps of:
defining an initial pattern identifying positions of data symbols, synchronization symbols and pilot symbols for a first number of sub-channels corresponding to a first bandwidth; defining one or more follow-on patterns identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth; constructing an extension pattern from at least one of the one or more follow-on patterns; appending the extension pattern to the initial pattern to form a base pattern identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth; and replicating the base pattern one or more times to form an expanded pattern identifying positions of data symbols, synchronization symbols and pilot symbols for a second number of sub-channels corresponding to a second bandwidth.
- 2. The method of claim 1 wherein the step of constructing an extension pattern comprises selecting only one follow-on pattern from the one or more defined follow-on patterns.
- 3. The method of claim 1 wherein the step of constructing an extension pattern comprises consecutively joining a plurality of the follow-on patterns.
- 4. The method of claim 3 wherein the step of constructing an extension pattern comprises consecutively joining two of the follow-on patterns.
- 5. The method of claim 4 wherein the step of defining one or more follow-on patterns comprises defining first and second types of follow-on patterns and wherein the step of constructing an extension pattern comprises consecutively joining one of the first type of follow-on patterns and one of the second type of follow-on patterns.
- 6. The method of claim 5 wherein the step of defining first and second types of follow-on patterns comprises the steps of
defining the first type of follow-on pattern identifying positions of synchronization symbols, pilot symbols and data symbols for the first number of sub-channels corresponding to the first bandwidth; defining the second type of follow-on pattern identifying positions of synchronization symbols, pilot symbols and data symbols for the first number of sub-channels corresponding to the first bandwidth, the second type of follow-on pattern corresponding substantially to the first pattern.
- 7. The method of claim 6 wherein the second type of follow-on pattern differs from the first type of follow-on pattern only in the last position of synchronization symbols, pilot symbols and data symbols identified in each of the first number of sub-channels.
- 8. The method of claim 1 wherein the base pattern spans a length of approximately 15 milliseconds, the initial pattern spans a length of 5 milliseconds and each of the one or more follow-on patterns spans a length of approximately 5 milliseconds.
- 9. The method of claim 2 wherein the base pattern spans a length of approximately 10 milliseconds, the initial pattern spans a length of 5 milliseconds and the extension pattern spans a length of approximately 5 milliseconds.
- 10. The method of claim 1 wherein the step of replicating the base pattern one or more times comprises the step of replicating the base pattern a number of times selected from a group consisting of one and two.
- 11. A method comprising the steps of:
defining an initial pattern identifying positions of data symbols, synchronization symbols and pilot symbols for a first number of sub-channels corresponding to a first bandwidth; defining a plurality of follow-on patterns identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth; constructing an extension pattern by consecutively joining two or more identical follow-on patterns of the plurality of follow-on patterns; and appending the extension pattern to the initial pattern to form a base pattern identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth.
- 12. The method of claim 11 further comprising the additional step of:
replicating the base pattern one or more times to form an expanded pattern identifying positions of data symbols, synchronization symbols and pilot symbols for a second number of sub-channels corresponding to a second bandwidth.
- 13. The method of claim 11 wherein the step of constructing an extension pattern comprises consecutively joining four identical follow-on patterns of the plurality of follow-on patterns.
- 14. The method of claim 13 wherein the step of constructing an extension pattern further comprises joining an additional follow-on pattern to the four joined identical follow-on patterns, the additional follow-on pattern not identical to each of the four joined identical follow-on patterns.
- 15. The method of claim 14 wherein the step of defining a plurality of follow-on patterns comprises the steps of:
defining the four identical follow-on patterns identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth; defining the additional follow-on pattern identifying positions of data symbols, synchronization symbols and pilot symbols for the first number of sub-channels corresponding to the first bandwidth, the additional follow-on pattern corresponding substantially to each of the four identical follow-on patterns.
- 16. The method of claim 15 wherein the additional follow-on pattern differs from the four identical follow-on patterns only in the last position of data symbols, synchronization symbols and pilot symbols identified in each of the first number of subchannels.
- 17. The method of claim 14 wherein the base pattern spans a time of 30 milliseconds, the initial pattern spans a time of 5 milliseconds, each of the four identical follow-on patterns spans a time of 5 milliseconds and the additional follow-on pattern spans a time of approximately 5 milliseconds.
- 18. The method of claim 11 wherein the base pattern spans a time of 30 milliseconds.
- 19. In a communication system wherein information in a first information signal is subdivided into M bit streams, each of the M bit streams being encoded to QAM symbols to form M symbol streams, whereby synchronization and pilot symbols are inserted into each of the M symbol streams, yielding M composite symbol streams filling a time-division multiplex slot, an improved method of positioning the synchronization and pilot symbols within the time-division multiplex slot, comprising:
defining an initial pattern identifying positions of the synchronization symbols and pilot symbols for a subset of the M composite streams for a portion of the time division multiplex slot; defining a plurality follow-on patterns identifying positions of the synchronization symbols and pilot symbols for a subset of the M composite streams for a portion of the time division multiplex slot; constructing an extension pattern by consecutively joining two or more identical patterns of the plurality of follow-on patterns, the extension pattern identifying positions of the synchronization and pilot symbols for a subset of the M composite streams for a portion of the time division multiplex slot; and appending the extension pattern to the initial pattern to form a base pattern replicating the base pattern zero or more times to form an expanded pattern identifying positions of the synchronization symbols and pilot symbols within the M composite symbol streams for the entire time division multiplex slot; and inserting the synchronization and pilot symbols into the M symbol streams at positions determined by the expanded pattern.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S. application Ser. No. 09/630235 titled “Scalable Pattern Methodology for Multi-Carrier Communication Systems,” incorporated herein by reference in its entirety.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09630235 |
Aug 2000 |
US |
Child |
09760984 |
Jan 2001 |
US |