Method and apparatus for burst pilot for a time division multiplex system

• US 7,184,426 B2
• Filed: 03/25/2004
• Issued: 02/27/2007
• Est. Priority Date: 12/12/2002
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Wheatley, Charles E. III, Grob, Matthew S., Bender, Paul E., Padovani, Roberto, Sindhushayana, Nagabhushana T., Hinderling, Jurg K.
• Primary Examiner(s): Phunkulh; Bob A.
• Application Number:
  US10/809,213
• Publication Number:
  US 20040179506A1
• Time in Patent Office: 1,069 Days
• Field of Search: None
• US Class Current: 370/347
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

Claims

1. An infrastructure element, comprising:

a modulator configured to time-division-multiplex a plurality of orthogonally covered digital data sequences and a sequence of pilot symbols to generate a sequence of digital values for transmission on a communications channel, wherein the modulator further comprises a multiplexer configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by puncturing the sequence of pilot symbols into the plurality of orthogonally covered digital data sequences such that a first subset of the plurality of orthogonally covered digital data sequences precedes in time the sequence of pilot symbols and the sequence of pilot symbols precedes in time a second subset of the plurality of orthogonally covered digital data sequences; and

a transmitter coupled to the modulator and configured to receive the sequence of digital values from the modulator, convert the sequence of digital values to an analog waveform, and transmit the analog waveform on the communications channel.

2. The infrastructure element of claim 1, wherein the modulator comprises an orthogonal cover element configured to exclusive-OR each bit of a sequence of digital data bits with a plurality of orthogonal sequences to generate the plurality of orthogonally covered digital data sequences.

3. The infrastructure element of claim 1, wherein the modulator further comprises a multiplexer configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

4. The infrastructure element of claim 2, wherein the modulator further comprises a multiplexer configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

5. An infrastructure element, comprising:

means for modulating configured to time-division-multiplex a plurality of orthogonally covered digital data sequences and a sequence of pilot symbols to generate a sequence of digital values for transmission on a communications channel, wherein the means for modulating is further configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by puncturing the sequence of pilot symbols into the plurality of orthogonally covered digital data sequences such that a first subset of the plurality of orthogonally covered digital data sequences precedes in time the sequence of pilot symbols and the sequence of pilot symbols precedes in time a second subset of the plurality of orthogonally covered digital data sequences; and

means for transmitting coupled to the means for modulating and configured to receive the sequence of digital values from the means for modulating, convert the sequence of digital values to an analog waveform, and transmit the analog waveform on the communications channel.

6. The infrastructure element of claim 5, further comprising an orthogonal cover element configured to exclusive-OR each bit of a sequence of digital data bits with a plurality of orthogonal sequences to generate the plurality of orthogonally covered digital data sequences.

7. The infrastructure element of claim 5, wherein the means for modulating is further configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

8. The infrastructure element of claim 6, wherein the means for modulating is further configured to time-division-multiplex the plurality of orthogonally covered digital data sequences and the sequence of pilot symbols by segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

9. A method of transmitting data, comprising:

time-division-multiplexing a plurality of orthogonally covered digital data sequences and a sequence of pilot symbols to generate a sequence of digital values, wherein the time-division-multiplexing further comprises puncturing the sequence of pilot symbols into the plurality of orthogonally covered digital data sequences such that a first subset of the plurality of orthogonally covered digital data sequences precedes in time the sequence of pilot symbols and the sequence of pilot symbols precedes in time a second subset of the plurality of orthogonally covered digital data sequences;

converting the sequence of digital values to an analog waveform; and

transmitting the analog waveform on a communications channel.

10. The method of claim 9, further comprising exclusive-ORing each bit of a sequence of digital data bits with a plurality of orthogonal sequences to generate the plurality of orthogonally covered digital data sequences.

11. The method of claim 9, wherein the time-division-multiplexing further comprises segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

12. The method of claim 10, wherein the time-division-multiplexing further comprises segmenting the plurality of orthogonally covered digital data sequences into first and second subsets, inserting the sequence of pilot symbols immediately subsequent in time to the first subset, and inserting the second subset immediately subsequent in time to the sequence of pilot symbols to generate the sequence of digital values for transmission.

13. A communications unit, comprising:

a receiver configured to receive a time-division-multiplexed signal including a plurality of orthogonally covered data sequences and a sequence of pilot values, wherein a first subset of the plurality of orthogonally covered data sequences occupies a first time segment of the time-division-multiplexed signal, the sequence of pilot values occupies a second time segment of the time-division-multiplexed signal, and a second subset of the plurality of orthogonally covered data sequences occupies a third time segment of the time-division-multiplexed signal; and

a demodulator coupled to the receiver and configured to receive the time-division-multiplexed signal from the receiver and demodulate the plurality of orthogonally covered data sequences.

14. The communications unit of claim 13, wherein the demodulator is further configured to use the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

15. The communications unit of claim 13, wherein the plurality of orthogonally covered data sequences each includes a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.

16. The communications unit of claim 13, wherein the first and third time segments are noncontiguous.

17. The communications unit of claim 13, wherein the first time segment precedes the second time segment and the second time segment precedes the third time segment.

18. The communications unit of claim 17, wherein the demodulator comprises a demultiplexer configured to demultiplex the time-division-multiplexed signal to generate the plurality of orthogonally covered data sequences and the sequence of pilot values.

19. The communications unit of claim 18, wherein the demodulator is further configured to use the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

20. The communications unit of claim 19, wherein the plurality of orthogonally covered data sequences each includes a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.

21. A communications unit, comprising:

means for receiving configured to receive a time-division-multiplexed signal including a plurality of orthogonally covered data sequences and a sequence of pilot values, wherein a first subset of the plurality of orthogonally covered data sequences occupies a first time segment of the time-division-multiplexed signal, the sequence of pilot values occupies a second time segment of the time-division-multiplexed signal, and a second subset of the plurality of orthogonally covered data sequences occupies a third time segment of the time-division-multiplexed signal; and

means for demodulating coupled to the means for receiving and configured to receive the time-division-multiplexed signal from the means for receiving and demodulate the plurality of orthogonally covered data sequences.

22. The communications unit of claim 21, wherein the means for demodulating is further configured to use the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

23. The communications unit of claim 21, wherein the plurality of orthogonally covered data sequences each includes a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.

24. The communications unit of claim 21, wherein the first and third time segments are noncontiguous.

25. The communications unit of claim 21, wherein the first time segment precedes the second time segment and the second time segment precedes the third time segment.

26. The communications unit of claim 25, wherein the means for demodulating comprises means for demultiplexing configured to demultiplex the time-division-multiplexed signal to generate the plurality of orthogonally covered data sequences and the sequence of pilot values.

27. The communications unit of claim 26, wherein the means for demodulating is further configured to use the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

28. The communications unit of claim 27, wherein the plurality of orthogonally covered data sequences each includes a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.

29. A method of receiving and processing data, comprising:

receiving a time-division-multiplexed signal including a plurality of orthogonally covered data sequences and a sequence of pilot values, wherein a first subset of the plurality of orthogonally covered data sequences occupies a first time segment of the time-division-multiplexed signal, the sequence of pilot values occupies a second time segment of the time-division-multiplexed signal, and a second subset of the plurality of orthogonally covered data sequences occupies a third time segment of the time-division-multiplexed signal; and

demodulating the plurality of orthogonally covered data sequences.

30. The method of claim 29, wherein the demodulating comprises using the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

31. The method of claim 29, wherein the receiving comprises receiving a plurality of orthogonally covered data sequences each including a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.

32. The method of claim 29, wherein the receiving further comprises receiving a time-division-multiplexed signal wherein the first and third time segments are noncontiguous.

33. The method of claim 29, wherein the receiving further comprises receiving a time-division-multiplexed signal wherein the first time segment precedes the second time segment and the second time segment precedes the third time segment.

34. The method of claim 33, further comprising demultiplexing the time-division-multiplexed signal to generate the plurality of orthogonally covered data sequences and the sequence of pilot values.

35. The method of claim 34, wherein the demodulating uses the sequence of pilot values to coherently demodulate the plurality of orthogonally covered data sequences.

36. The method of claim 35, wherein the receiving further comprises receiving a plurality of orthogonally covered data sequences each including a set of data values that has each been spread by an orthogonal sequence, there being a distinct orthogonal sequence assigned to each set of data values.