High data rate CDMA wireless communication system using variable sized channel codes

• US 7,715,461 B2
• Filed: 01/13/2004
• Issued: 05/11/2010
• 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 TOI
• Application Number:
  US10/756,868
• Publication Number:
  US 20040190600A1
• Time in Patent Office: 2,310 Days
• Field of Search: 375/135, 375/146, 375/260, 375/299, 375264-267, 370/208, 370/210, 370/320, 370/335, 370/342, 370/209
• 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 multiplier 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, comprising:

modulating each of a plurality of channels of data with an associated code to produce a plurality of streams of modulated symbols;

combining the plurality of streams of modulated symbols into a combined stream; and

complex multiplying said combined stream with a complex pseudonoise code to reduce a peak-to-average ratio of the transmission,

wherein the modulating each of the plurality of channels of data with the associated code comprises;

modulating control data with a first code to produce a first stream of modulated symbols; and

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

2. The method as claimed in claim 1, wherein said combining the plurality of streams of modulated symbols comprises:

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

3. The method as claimed in claim 1, wherein said modulating each of the plurality of channels of data further comprises:

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

4. The method as claimed in claim 3, further comprising:

providing a fourth stream comprising a pilot channel of pilot channel data.

5. The method as claimed in claim 4, wherein said combining the plurality of streams of modulated symbols comprises:

adding the fourth stream to the first stream of modulated symbols to provide a first added stream; and

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

6. The method as claimed in claim 4, wherein said combining the plurality of streams of modulated symbols comprises:

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

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

providing said first added stream separately from the second added stream for said complex multiplying and merging said first added stream and said second added stream by said complex multiplying.

7. The method as claimed in claim 3, wherein a length of the second code differs from a length of the third code.

8. The method as claimed in claim 1, wherein said combining the plurality of streams of modulated symbols comprises:

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

providing said first added stream of modulated symbols separately from a third stream of modulated symbols for said complex multiplying and merging said first added stream of modulated symbols and said third stream of modulated symbols by said complex multiplying.

9. 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.

10. The method as claimed in claim 9, wherein the in-phase pseudonoise code component and the quadrature-phase pseudonoise code component arc multiplied by a long code.

11. The method as claimed in claim 9, wherein said complex multiplying comprises:

using a first of the combined stream and the in-phase pseudonoise code component as real parts; and

using a second of the combined stream and the quadrature-phase pseudonoise code component as imaginary parts.

12. The method as claimed in claim 11, wherein said complex multiplying comprises:

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

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

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

multiplying the second of the combined stream 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.

13. The method as claimed in claim 1, wherein the associated code is a Walsh code.

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

adjusting gains of the plurality of streams of modulated symbols.

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

adjusting gain of the first stream of modulated symbols; and

adjusting gain of the second stream of modulated symbols to a value determined relative to the gain of the first stream of modulated symbols.

16. 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 channels of data with an associated code to produce a plurality of streams of modulated symbols;

a combiner, communicatively coupled to said plurality of modulators, configured to combine the plurality of streams of modulated symbols into a combined stream; and

a complex multiplier, communicatively coupled to said combiner, configured to complex multiply said combined stream with a complex pseudonoise code to reduce a peak-to-average ratio of the transmission,

wherein said plurality of modulators comprises;

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

a second modulator configured to modulate a user first 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 receive at least one stream of modulated symbols and provide a first combined stream.

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

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

19. The apparatus as claimed in claims 18, further comprising:

a fourth stream comprising a pilot channel of pilot channel data.

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

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

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

a first adder configured to add the first stream of modulated symbols to the second stream of modulated symbols to provide a first combined stream; and

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

22. The apparatus as claimed in claim 18, wherein a length of the second code differs from a length of the third code.

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

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

24. The apparatus as claimed in claim 16, wherein the complex pseudonoise code comprises an in-phase pseudonoise code component and a quadrature-phase pseudonoise code component.

25. The apparatus as claimed in claim 24, wherein the in-phase pseudo noise code component and the quadrature-phase pseudo noise code component are multiplied by a long code.

26. The apparatus as claimed in claim 24, wherein said complex multiplier is configured to:

use a first of the combined stream and the in-phase pseudonoise code component as real parts; and

use a second of the combined stream and the quadrature-phase pseudonoise code component as imaginary parts.

27. The apparatus as claimed in claim 26, wherein said complex multiplier comprises:

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

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

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

a fourth multiplier configured to multiply the second combined stream 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.

28. The apparatus as claimed in claim 16, wherein the associated code comprises a Walsh code.

29. The apparatus as claimed in claim 16, further comprising:

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

30. The apparatus as claimed in claim 29, wherein said plurality of gain adjusters comprises:

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

a second gain adjuster configured to adjust gain of the second stream of modulated symbols to a value determined relative to the gain of the first stream of modulated symbols.

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

means for modulating each of a plurality of channels of data with an associated code to produce a plurality of streams of modulated symbols;

means for combining the plurality of streams of modulated symbols into a combined stream; and

means for complex multiplying said combined stream with a complex pseudonoise code to reduce a peak-to-average ratio of the transmission,

wherein the means for modulating each of the plurality of channels of data with the associated code comprises;

means for modulating control data with a first code to produce a first stream of modulated symbols; and

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