Code division multiplexing commands on a code division multiplexed channel

• US 8,391,249 B2
• Filed: 06/30/2003
• Issued: 03/05/2013
• Est. Priority Date: 02/18/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Odenwalder, Joseph P., Sarkar, Sandip
• Primary Examiner(s): PATEL, CHANDRAHAS B
• Application Number:
  US10/611,333
• Publication Number:
  US 20040160933A1
• Time in Patent Office: 3,536 Days
• Field of Search: 370/335, 370/342, 370/465, 375/512, 375/149
• US Class Current: 370/335
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
• CPC Class Codes: H04J 13/0048 Walsh

Abstract

An apparatus includes a first encoder for receiving a plurality of symbol streams for respective ones of a plurality of mobile stations and encoding each of the symbol streams with one of a plurality of covering sequences to form a plurality of covered sequences. The apparatus further includes a summer for summing the plurality of covered sequences to form a first Code Division Multiplexed (CDM) signal. In addition, the apparatus includes a second encoder for covering the first CDM signal with a covering sequence to form a first covered CDM signal. A system and method for multiplexing plurality of symbol streams are also provided.

Claims

1. An apparatus, comprising:

a first Hadamard encoder for receiving a plurality of symbol streams for respective ones of a plurality of remote stations and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

a second encoder for covering the first CDM signal with a Walsh covering sequence to form first covered CDM signal.

2. The apparatus of claim 1, further comprising one or more channel gain blocks for receiving a plurality of gain values and multiplying the plurality of covered streams by the plurality of gain values, respectively, prior to delivery to the summer.

3. The apparatus of claim 1, wherein one or more of the plurality of symbol streams comprises command values, the command values indicating acknowledgement, negative acknowledgement, or acknowledge and continue.

4. The apparatus of claim 1, further comprising a transmitter for receiving the first covered CDM signal and one or more additional covered signals, combining the first covered CDM signal and the one or more additional covered signals to form a combined CDM signal, and transmitting the combined CDM signal to a remote station.

5. The apparatus of claim 1, wherein each sequence is assigned in a time varying manner.

6. A non-transitory processor readable media, operable to perform the following steps;

Hadamard covering each of a plurality of symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier of the respective remote station, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

summing subsets of the plurality of covered streams to form a plurality of CDM signal;

time division multiplexing the plurality of CDM signals to form a TDM signal; and

covering the TDM signal with a Walsh covering sequence to form a first covered TDM/CDM signal configured for transmission in CDM fashion.

7. A non-transitory processor readable media, operable to perform the following steps:

Hadamard covering each of a plurality of symbol streams for respective ones of a plurality of remote stations with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

covering the first CDM signal with a Walsh covering sequence to form a first covered CDM signal.

8. An apparatus, comprising:

means for Hadamard covering each of a plurality of symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered, streams, wherein each of the plurality of covering sequences is based on a remote station identifier of a respective remote station, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

means for summing subsets of the plurality of covered streams to form a plurality of CDM signals;

means for time division multiplexing the plurality of CDM signals to form a TDM signal; and

means for covering the TDM signal with a Walsh covering sequence to form a first covered TDM/CDM signal configured for transmission in CDM fashion.

9. A method of multiplexing a plurality of symbol streams, comprising:

Hadamard covering each of a plurality of symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier of the respective remote station, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being, unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

summing subsets of the plurality of covered streams to form a plurality of CDM signals;

time multiplexing the plurality of CDM signals to form a TDM signal; and

covering the TDM signal with a Walsh covering sequence to form a first covered TDM/CDM signal configured for transmission in CDM fashion.

10. The method of claim 9, further comprising:

combining the covered TDM/CDM signal and one or more additional covered signals; and

transmitting the combined CDM signals to one or more remote stations.

11. An apparatus, comprising:

a plurality of CDM encoders for receiving a plurality of symbol streams for a respective plurality of remote stations and producing a plurality of covered CDM signals, each CDM encoder comprising;

a first Hadamard encoder for receiving the plurality of symbol streams and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier of the respective remote station, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a CDM signal;

a time multiplexer for receiving the plurality of covered CDM signals and forming a Time Division Multiplexed (TDM) signal comprising the plurality of covered CDM signals; and

a second encoder for covering the TDM signal with a Walsh covering sequence to form a covered TDM/CDM signal configured for transmission in CDM fashion.

12. The apparatus of claim 11, wherein each CDM encoder further comprises one or more channel gain blocks for receiving a plurality of gain values and multiplying the plurality of covered streams by the plurality of gain values, respectively, prior to delivery to the summer.

13. The apparatus of claim 11, further comprising a transmitter for receiving the covered TDM/CDM signal and one or more additional covered signals, combining the covered TDM/CDM signal and one or more additional covered signals to form a combined CDM signal, and transmitting the combined CDM signal to a remote station.

14. An apparatus, comprising:

means for Hadamard covering each of a plurality of symbol streams for respective ones a plurality of remote stations with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

means for summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

means for covering the first CDM signal with a Walsh covering sequence to form a first covered CDM signal.

15. A wireless communication system, including a wireless communication device comprising:

a plurality of CDM encoders for receiving a plurality of symbol streams for a respective plurality of remote stations and producing a plurality of covered CDM signals, each CDM encoder comprising;

a first Hadamard encoder for receiving the plurality of symbol streams and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier of the respective remote station, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a CDM signal;

a time multiplexer for receiving the plurality of covered CDM signals and forming, a Time Division Multiplexed (TDM) signal comprising the plurality of covered CDM signals; and

a second encoder for covering the TDM signal with a Walsh covering sequence to form a covered TDM/CDM signal configured for transmission in CDM fashion.

16. A wireless communication system, including a first wireless communication device comprising:

a first Hadamard encoder for receiving a plurality of symbol streams for respective ones of a plurality of remote stations and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

a second encoder for covering the first CDM signal with a Walsh covering sequence to form a first covered CDM signal.

17. A wireless communication device, comprising:

a first Hadamard encoder for receiving a plurality of symbol streams for respective ones of a plurality of remote stations and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein, each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

a second encoder for covering the first CDM signal with a Walsh covering sequence to form a first covered CDM.

18. A wireless communication device, comprising:

a plurality of CDM encoders for receiving a plurality of symbol streams for a respective plurality of remote stations and producing a plurality of covered CDM signals, each CDM encoder comprising;

a first Hadamard encoder for receiving the plurality of symbol streams and encoding each of the symbol streams with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier of the respective remote station, wherein the first Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

a summer for summing the plurality of covered streams to form a CDM signal;

a time multiplexer for receiving the plurality of covered CDM signals and forming a Time Division Multiplexed (TDM) signal comprising the plurality of covered CDM signals; and

a second encoder for covering the TDM signal with a Walsh covering sequence to form a covered TDM/CDM signal configured for transmission in CDM fashion.

19. A method of multiplexing a plurality of symbol streams, comprising:

Hadamard covering each of a plurality of symbol streams for respective ones of a plurality of remote stations with one of a plurality of covering sequences with pattern repetition to form a plurality of covered streams, wherein each of the plurality of covering sequences is based on a remote station identifier for the respective one of the plurality of remote stations, wherein Hadamard covering includes utilizing a Hadamard encoder in which the Hadamard encoder segments encoding time into two or more segments and covers each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream, and wherein a first Hadamard sequence is selected corresponding to a first remote station identifier and a second Hadamard sequence is selected based on a second remote station identifier;

summing the plurality of covered streams to form a first Code Division Multiplexed (CDM) signal; and

covering the first CDM signal with a Walsh covering sequence to form a first covered CDM signal.

20. The method of claim 19, further comprising multiplying the plurality of covered streams by the plurality of gain values, respectively, prior to summing.

21. The method of claim 19, further comprising:

combining the first covered CDM signal and the one or more additional covered signals; and

transmitting the combined CDM signal to one or more remote stations.

22. The method of claim 19, further comprising:

Hadamard covering each of a second plurality of symbol streams with one of the plurality of covering sequences with pattern repetition to form a second plurality of covered streams;

summing the second plurality of covered streams to form a second CDM signal;

covering the second CDM signal with a second I and Q Walsh covering sequence to form a second covered CDM signal;

transmitting the first covered CDM signal on an in-phase channel; and

transmitting the second covered CDM signal on a quadrature channel.

23. The method of claim 19, wherein one or more of the plurality of symbol streams comprises command values, the command values indicating acknowledgement, negative acknowledgement, or acknowledge and continue.

24. The method of claim 19, wherein the covering each of the plurality of symbol streams comprises:

segmenting the encoding time into two or more segments;

Hadamard covering each of the plurality of symbol streams with two or more sequences with pattern repetition, each sequence for covering during the two or more segments, respectively, and the sequence covering each symbol stream during a segment being unique to the respective symbol stream.

25. The method of claim 24, wherein the two or more sequences are assigned in a time varying manner.