Joint signal demodulation in a low and high data rate channel environment

• US 20050277400A1
• Filed: 06/10/2005
• Published: 12/15/2005
• Est. Priority Date: 06/10/2004
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shah, Yogendra
• Granted Patent: US 7,609,790 B2
• Time in Patent Office: Days
• US Class Current: 455/284
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• CPC Class Codes: H04B 1/71072 Successive interference cancellation
• CPC Class Codes: H04L 25/0262 Arrangements for detecting the data rate of an incoming signal

Abstract

A receiver is capable of demodulating both high data rate and low data rate transmissions. An antenna receives the high and low data rate transmissions, as a received signal. An interference canceling device cancels a contribution of at least one shared/common channel from the received signal, producing a first interference canceled signal. A first data detector for detecting data of one of the high or low data rate transmissions by processing the first interference canceled signal. An interference canceling device for canceling the detected data of the one transmissions from the first interference canceled signal, producing a second interference canceled signal. A second data detector for detecting data of an other of the high or low data rate transmissions from the second interference canceled signal.

Claims

1. A receiver capable of demodulating both high data rate and low data rate transmissions, the receiver comprising:

an antenna for receiving the high and low data rate transmissions, as a received signal;

an interference canceling device for canceling a contribution of at least one shared/common channel from the received signal, producing a first interference canceled signal;

a first data detector for detecting data of one of the high or low data rate transmissions by processing the first interference canceled signal;

an interference canceling device for canceling the detected data of the one transmissions from the first interference canceled signal, producing a second interference canceled signal; and

a second data detector for detecting data of an other of the high or low data rate transmissions from the second interference canceled signal.

2. The receiver of claim 1 wherein the detected data of the one transmissions is detected data of the low data rate transmissions.

3. The receiver of claim 2 wherein the detected data of the low data rate transmissions is low data rate transmissions from a plurality of cells and the detected data of the low data rate transmissions from the plurality of cells are combined and a single one of the cells detected low data rate data is used to produce the first interference canceled signal.

4. The receiver of claim 1 wherein the detected data of the one transmissions is detected data of the high data rate transmissions.

6. The receiver of claim 1 wherein the receiver is receiving W-CDMA FDD transmissions and the low data rate transmissions are DPCH transmissions and the high data rate transmissions are HSDPA transmissions.

7. The receiver of claim 6 wherein the at least one shared/common channel is at least one of a PICH, CPICH, P-CCPCH, S-CCPCH and a high speed shared control channel.

8. The receiver of claim 1 wherein the receiver is receiving CDMA2000 transmissions and the low data rate transmission are dedicated channel transmissions and the high data rate transmissions are F-PDCH transmissions.

9. The receiver of claim 8 wherein the at least one shared/common channel is at least one of a pilot channel, synchronization channel, paging channel, broadcast control channel, forward common control channel, common assignment channel and forward dedicated control channel.

10. The receiver of claim 1 for use in a wireless transmit/receive unit.

11. The receiver of claim 1 for use in a base station.

12. The receiver of claim 1 wherein the interference canceling devices and the first and second data detectors are implemented using an integrated circuit.

5. The receiver of claim 5 wherein data of each of a plurality of cells high data rate transmissions are detected and for each cell, that cells high data rate transmissions are cancelled from the received signal prior to the detecting of the low data rate data of that cell and the receiver further comprising a combiner for combining the detected low data rate data of each cell.

13. A receiver capable of demodulating both high data rate and low data rate transmissions, the receiver comprising:

antenna means for receiving the high and low data rate transmissions, as a received signal;

first interference canceling means for canceling a contribution of at least one shared/common channel from the received signal, producing a first interference canceled signal;

first data detector means for detecting data of one of the high or low data rate transmissions by processing the first interference canceled signal;

second interference canceling means for canceling the detected data of the one transmissions from the first interference canceled signal, producing a second interference canceled signal; and

second data detector means for detecting data of an other of the high or low data rate transmissions from the second interference canceled signal.

14. The receiver of claim 13 wherein the detected data of the one transmissions is detected data of the low data rate transmissions.

15. The receiver of claim 14 wherein the detected data of the low data rate transmissions is low data rate transmissions from a plurality of cells and the detected data of the low data rate transmissions from the plurality of cells are combined and a single one of the cells detected low data rate data is used to produce the first interference canceled signal.

16. The receiver of claim 13 wherein the detected data of the one transmissions is detected data of the high data rate transmissions.

17. The receiver of claim 16 wherein data of each of a plurality of cells high data rate transmissions are detected and for each cell, that cells high data rate transmissions are cancelled from the received signal prior to the detecting of the low data rate data of that cell and the receiver further comprising a combiner for combining the detected low data rate data of each cell.

18. The receiver of claim 13 wherein the receiver is receiving W-CDMA FDD transmissions and the low data rate transmission are DPCH transmissions and the high data rate transmissions are HSDPA transmissions.

19. The receiver of claim 18 wherein the at least one shared/common channel is at least one of a PICH, CPICH, P-CCPCH, S-CCPCH and a high speed shared control channel.

20. The receiver of claim 13 wherein the receiver is receiving CDMA2000 transmissions and the low data rate transmission are dedicated channel transmissions and the high data rate transmissions are F-PDCH transmissions.

21. The receiver of claim 20 wherein the at least one shared/common channel is at least one of a pilot channel, synchronization channel, paging channel, broadcast control channel, forward common control channel, common assignment channel and forward dedicated control channel.

22. The receiver of claim 13 for use in a wireless transmit/receive unit.

23. The receiver of claim 13 for use in a base station.

24. The receiver of claim 13 wherein the interference canceling devices and the first and second data detectors are implemented using an integrated circuit.

25. The receiver of claim 24 wherein the integrated circuit is configured to cancel interference using independent component analysis (ICA).

26. The receiver of claim 25 wherein the integrated circuit is configured to construct a separation matrix using statistical processing to separate the signals and perform a signal analysis to determine signals of interest.

27. A receiver capable of demodulating both high data rate and low data rate transmissions, the receiver receiving the low data rate transmissions from a plurality of cells or sectors, the receiver comprising:

an antenna for receiving the high and low data rate transmissions, as a received signal;

a plurality of low data rate data detectors, each low data rate data detector detecting data for a low data rate transmission for a respective cell or sector;

a combiner for combining an output of the plurality of low data rate data detectors as combined low data rate data;

an interference canceling device for canceling a contribution of an output of a single one of the plurality of low data rate data detectors from the received signal; and

a high data rate detector for detecting high data rate data from an output of the interference canceling device.

28. The receiver of claim 27 wherein the outputs of the low data rate detectors are time aligned prior to being combined.

29. A receiver capable of demodulating both high data rate and low data rate transmissions, the receiver receiving the low and high data rate transmissions from a plurality of cells or sectors, the receiver comprising:

an antenna for receiving the high and low data rate transmissions, as a received signal;

for each cell or sector;

a high data rate data detector for detecting high data rate data for that cell or sector;

an interference canceling device for canceling a contribution of an output of the high data rate data detector from the received signal; and

a low data rate data detector for detecting low data rate data from an output of the interference canceling device; and

a combiner for combining a plurality of outputs of the low data rate detectors for the cells or sectors to produce combined low data rate data.

30. The receiver of claim 29 wherein the outputs of the low data rate detectors are time aligned prior to the combining.