Method and apparatus for transmitting and receiving high speed data in a CDMA communication system using multiple carriers

• US 7,333,465 B2
• Filed: 01/30/2002
• Issued: 02/19/2008
• Est. Priority Date: 09/16/1997
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jou, Yu-Cheun
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US10/062,133
• Publication Number:
  US 20020122398A1
• Time in Patent Office: 2,211 Days
• Field of Search: 370/342, 370/465, 370/479, 370/482, 370/543, 370/207, 370/481, 370/542
• US Class Current: 370/342
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 5/0017 in which a distinct code is applied, as a temporal sequence, to each frequency
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

The present invention is a novel and improved method and apparatus for transmitting data in a multiple carrier CDMA communication system. In the first implementation of the present invention, the data is encoded and the resulting encoded symbols are divided up and transmitted on different frequencies. The encoded symbols are provided to a symbol repetition means which keeps the symbol rate of data to be transmitted fixed. In a second embodiment, no symbol repetition is provided and variable length Walsh sequences are used to handle data rate variations.

Claims

1. A wireless transmitter, comprising:

an encoder for encoding a set of information bits to provide a set of code symbols at a data rate;

a demultiplexer for providing said set of code symbols in first and second code symbol subsets having different code symbol rates to first and second modulators, wherein said data rate is equal to a combined said different code symbol rates, said first and second modulators respectively modulating said first and second code symbol subsets according to first and second code symbol rate formats, respectively, wherein said different code symbol rates have a ratio equal a number other than one, to provide modulated first code symbol subset and second code symbol subset.

2. The wireless transmitter of claim 1 wherein said first and second modulators repeat code symbols within said first and second code symbol subsets, respectively, according to a said respective code symbol rate.

3. The wireless transmitter of claim 2 wherein said transmission subsystem scales a respective energy of said first and second modulated code symbol subsets according to a respective amount of code symbol repetition.

4. The wireless transmitter of claim 1 wherein said first modulator includes a first interleaver having a first interleaver format dependent on a first code symbol rate, and said second modulator includes a second interleaver having a second interleaver format dependent on a second code symbol rate.

5. The wireless transmitter of claim 1 wherein said first modulator includes a first PN scrambler for scrambling said first code symbol subset according to a first code symbol rate, and said second modulator includes a second PN scrambler for scrambling said second code symbol subset according to a second code symbol rate.

6. A wireless transmitter, comprising:

means for encoding a set of information bits to provide a set of code symbols at a data rate; and

means for providing said set of code symbols in first and second code symbol subsets having different code symbol rates to first and second modulators, wherein said data rate is equal to a combined said different code symbol rates, said first and second modulators respectively modulating said first and second code symbol subsets according to first and second code symbol rate formats, respectively, wherein said different code symbol rates have a ratio equal a number other than one, to provide modulated first code symbol subset and second code symbol subset.

7. The wireless transmitter of claim 6 wherein said first and second modulators repeat code symbols within said first and second code symbol subsets, respectively, according to a said respective code symbol rate.

8. The wireless transmitter of claim 6 wherein said transmission subsystem scales a respective energy of said first and second modulated code symbol subsets according to a respective amount of code symbol repetition.

9. The wireless transmitter of claim 6 wherein said first modulator includes a first interleaver having a first interleaver format dependent on a first code symbol rate, and said second modulator includes a second interleaver having a second interleaver format dependent on a second code symbol rate.

10. The wireless transmitter of claim 6 wherein said first modulator includes a first PN scrambler for scrambling said first code symbol subset according to a first code symbol rate, and said second modulator includes a second PN scrambler for scrambling said second code symbol subset according to a second code symbol rate.

11. A method operational on a wireless transmitter, comprising:

encoding a set of information bits to provide a set of code symbols at a data rate; and

providing said set of code symbols in first and second code symbol subsets having different code symbol rates to first and second modulators, wherein said data rate is equal to a combined said different code symbol rates, said first and second modulators respectively modulating said first and second code symbol subsets according to first and second code symbol rate formats, respectively, wherein said different code symbol rates have a ratio equal a number other than one, to provide modulated first code symbol subset and second code symbol subset.

12. The method claim 11 wherein said first and second modulators repeat code symbols within said first and second code symbol subsets, respectively, according to a said respective code symbol rate.

13. The method claim 11 wherein said transmission subsystem scales a respective energy of said first and second modulated code symbol subsets according to a respective amount of code symbol repetition.

14. The method claim 11 wherein said first modulator includes a first interleaver having a first interleaver format dependent on a first code symbol rate, and said second modulator includes a second interleaver having a second interleaver format dependent on a second code symbol rate.

15. The method claim 11 wherein said first modulator includes a first PN scrambler for scrambling said first code symbol subset according to a first code symbol rate, and said second modulator includes a second PN scrambler for scrambling said second code symbol subset according to a second code symbol rate.