High rate CDMA wireless communication system using variable sized channel codes

• US 8,213,485 B2
• Filed: 03/24/2010
• Issued: 07/03/2012
• Est. Priority Date: 05/28/1996
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Odenwalder, Joseph P.
• Primary Examiner(s): Tse, Young T.
• Application Number:
  US12/730,510
• Publication Number:
  US 20100177744A1
• Time in Patent Office: 832 Days
• Field of Search: 375/135, 375/140, 375/146, 375/260, 375/261, 375/265, 375/267, 375/299, 370/208, 370/209, 370/335, 370/342
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04W 52/04 TPC

Abstract

Method and apparatus for high rate code-division multiple access wireless communication is described. Each of a channel encoded data is modulated by an associated code having a small number of pseudo-noise spreading chips per orthogonal waveform period, thus producing a set of streams of modulated symbols. Each of the set of streams of modulated symbols is then gain adjusted, and combined to yield two streams of combined symbols. The combination is the set of streams is carried out to reduce a peak-to-average ratio of the transmission. The resulting two combined symbol streams are modulated by a complex multiplyer using a user long code and a pseudorandom spreading code (PN code) and upconverted for transmission.

Claims

1. A method for generating data for transmission from a subscriber unit to a base station, the method comprising:

modulating each of a plurality of channel encoded data with an associated code to produce a plurality of streams of modulated symbols, wherein the code associated with one of the plurality of channel encoded data has a longer length than the code associated with another one of the plurality of channel encoded data;

combining the plurality of streams of modulated symbols and pilot channel data into two combined streams to reduce a peak-to-average ratio of the transmission; and

complex multiplying said two combined streams with a complex pseudonoise code.

2. The method as claimed in claim 1, wherein the modulating each of the plurality of channel encoded data with the associated code comprises:

modulating a user first channel encoded data with a first code to produce a first stream of modulated symbols; and

modulating a user second channel encoded data with a second code to produce a second stream of modulated symbols.

3. The method as claimed in claim 2, wherein said combining the plurality of streams of modulated symbols and the pilot channel data comprises:

separately providing said first stream of modulated symbols and said second stream of modulated symbols for said complex multiplying.

4. The method as claimed in claim 2, wherein said combining the plurality of streams of modulated symbols and the pilot channel data comprises:

adding the first stream of modulated symbols to the pilot channel data to provide a first added stream of modulated symbols; and

separately providing said first added stream of modulated symbols and a second added stream of modulated symbols for said complex multiplying.

5. The method as claimed in claim 2, wherein the modulating each of the plurality of channel encoded data with the associated code further comprises:

modulating a control channel encoded data with a third code to produce a third stream of modulated symbols.

6. The method as claimed in claim 5, wherein said combining the plurality of streams of modulated symbols and the pilot channel data comprises:

adding the first stream of modulated symbols to the pilot channel data to provide a first added stream of modulated symbols;

adding the second stream of modulated symbols to the third stream of modulated symbols to provide a second added stream of modulated symbols; and

separately providing said first added stream of modulated symbols and the second added stream of modulated symbols for said complex multiplying.

7. The method as claimed in claim 2, wherein the length of the first code is greater than the length of the second code.

8. The method as claimed in claim 1 wherein the complex pseudonoise code comprises an in-phase pseudonoise code component and a quadrature-phase pseudonoise code component.

9. The method as claimed in claim 8 wherein each of the in-phase pseudonoise code component and the quadrature-phase pseudonoise code component is multiplied by a long code.

10. The method as claimed in claim 1 wherein said complex multiplying comprises:

using a first of at least one of the two combined streams and an in-phase pseudonoise code component as real parts; and

using a second of at least one of the two combined streams and a quadrature-phase pseudonoise code component as imaginary parts.

11. The method as claimed in claim 10 wherein said complex multiplying further comprises:

multiplying a first of the two combined streams by the in-phase pseudonoise code component to produce a first intermediate signal;

multiplying a second of the two combined streams by the in-phase pseudonoise code component to produce a second intermediate signal;

multiplying the first of the two combined streams by the quadrature-phase pseudonoise code component to produce a third intermediate signal;

multiplying the second of the two combined streams by the quadrature-phase pseudonoise code component to produce a fourth intermediate signal;

subtracting the fourth intermediate signal from the first intermediate signal to produce an in-phase product signal; and

adding the second intermediate signal to the third intermediate signal to produce a quadrature-phase product signal.

12. The method as claimed in claim 1, wherein the codes associated with the plurality of streams of modulated symbols comprise Walsh codes.

13. The method as claimed in claim 1, further comprising:

adjusting the gains of the plurality of streams of modulated symbols.

14. The method as claimed in claim 13, wherein said adjusting the gains of the plurality of streams of modulated symbols comprises:

adjusting the gain of a first stream of the plurality of streams of modulated symbols; and

adjusting the gains of each of the remaining streams of the plurality of streams of modulated symbols.

15. An apparatus for generating data for transmission from a subscriber unit to a base station, the apparatus comprising:

a plurality of modulators configured to modulate each of a plurality of channel encoded data with an associated code to produce a plurality of streams of modulated symbols, wherein the code associated with one of the plurality of channel encoded data has a longer length than the code associated with another one of the plurality of channel encoded data;

a combiner, communicatively coupled to said plurality of modulators, configured to combine the plurality of streams of modulated symbols and pilot channel data into two combined streams to reduce a peak-to-average ratio of the transmission; and

a complex multiplier, communicatively coupled to said combiner, configured to complex multiply said two combined streams with a complex pseudonoise code.

16. The apparatus as claimed in claim 15, wherein said plurality of modulators comprises:

a first modulator configured to modulate a user first channel encoded data with a first code to produce a first stream of modulated symbols; and

a second modulator configured to modulate a user second channel encoded data with a second code to produce a second stream of modulated symbols.

17. The apparatus as claimed in claim 16, wherein said combiner comprises:

a first adder configured to add the first stream of modulated symbols and the pilot channel data to provide a first combined stream; and

a second adder configured to add the second stream of modulated symbols to a third stream of the plurality of streams of modulated symbols to provide a second combined stream.

18. The apparatus as claimed in claim 16, wherein said plurality of modulators further comprises:

a third modulator configured to modulate a control channel encoded data with a third code to produce a third stream of modulated symbols.

19. The apparatus as claimed in claim 18, wherein said combiner comprises:

a first adder configured to add the pilot channel data to the first stream of modulated symbols to provide a first combined stream; and

a second adder configured to add the third stream of modulated symbols to the second stream of modulated symbols to provide a second combined stream.

20. The apparatus as claimed in claim 16, wherein the length of the first code is greater than the length of the second code.

21. The apparatus as claimed in claim 15 wherein the complex pseudonoise code comprises an in-phase pseudonoise code component and a quadrature-phase pseudonoise code component.

22. The apparatus as claimed in claim 21 wherein each of the in-phase pseudonoise code component and the quadrature-phase pseudonoise code component is multiplied by a long code.

23. The apparatus as claimed in claim 15 wherein said complex multiplier is configured to:

use a first of at least one of the two combined streams and an in-phase pseudonoise code component as real parts; and

use a second of at least one of the two combined streams and a quadrature-phase pseudonoise code component as imaginary parts.

24. The apparatus as claimed in claim 23 wherein said complex multiplier comprises:

a first multiplier configured to multiply a first of the two combined streams by the in-phase pseudonoise code component to produce a first intermediate signal;

a second multiplier configured to multiply a second of the two combined streams by the in-phase pseudonoise code component to produce a second intermediate signal;

a third multiplier configured to multiply the first of the two combined streams by the quadrature-phase pseudonoise code component to produce a third intermediate signal;

a fourth multiplier configured to multiply the second of the two combined streams by the quadrature-phase pseudonoise code component to produce a fourth intermediate signal;

a first adder configured to subtract the fourth intermediate signal from the first intermediate signal to produce an in-phase product signal; and

a second adder configured to add the second intermediate signal to the third intermediate signal to produce a quadrature-phase product signal.

25. The apparatus as claimed in claim 15, wherein the codes associated with the plurality of streams of modulated symbols comprise Walsh codes.

26. The apparatus as claimed in claim 15, further comprising:

a plurality of gain adjusters configured to adjusting the gains of the plurality of streams of modulated symbols.

27. The apparatus as claimed in claim 26, wherein said plurality of gain adjusters comprises:

a first gain adjuster configured to adjust the gain of a first stream of the plurality of streams of modulated symbols; and

a second plurality of gain adjusters configured to adjust the gains of each of the remaining streams of the plurality of streams of modulated symbols.