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

• US 6,621,875 B2
• Filed: 03/12/2001
• Issued: 09/16/2003
• Est. Priority Date: 05/28/1996
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Odenwalder, Joseph P.
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US09/804,652
• Publication Number:
  US 20010055329A1
• Time in Patent Office: 918 Days
• Field of Search: 375/146, 375/148, 375/262, 375/265, 375/295, 375/298, 370/208, 714/756, 714/792
• US Class Current: 375/295
• 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

A method and apparatus for high rate CDMA wireless communication is described. Variable data rates are generated using a set of different encoder, interleaver, and symbol repetition configurations. An encoder associated with each rate generates a variable number of symbols during each frame period. This variable number of symbols is repeated as necessary to form a constant number of symbols equal to a fixed number of symbols that can be then repeated a fixed number of repetitions before transmission. Where the constant number of symbols is not an integer multiple of the variable number of symbols for a particular rate, a subset of the variable number of symbols is repeated to fill in the remaining symbols necessary to equal the constant number of symbols.

Claims

1. A method of transmitting a variable data rate signal comprising:

interleaving a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols;

repeating the sequence of interleaved symbols a number of times; and

repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols.

2. The method of claim 1 wherein the first predetermined number of symbols is 216.

3. The method of claim 2 wherein the second predetermined number is 120.

4. The method of claim 1 wherein the first predetermined number of symbols is 120.

5. The method of claim 4 wherein the second predetermined number is 48.

6. The method of claim 1 wherein the second predetermined number of symbols is 120.

7. The method of claim 6 wherein the first predetermined number is 216, and wherein the number of times is three.

8. The method of claim 1 wherein the second predetermined number of symbols is 48.

9. The method of claim 8 wherein the first predetermined number is 120, and wherein the number of times is six.

10. The method of claim 1 wherein the number of times is based on a number of code symbols in the frame of code symbols.

11. The method of claim 1 wherein the second predetermined number of symbols is based on the number of code symbols in the frame of code symbols.

12. A transmitter apparatus comprising:

an interleaver configured to interleave a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols; and

a repeater configured to repeat the sequence of interleaved symbols a number of times and to repeat a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols.

13. The apparatus of claim 12 wherein the first predetermined number of symbols is 216.

14. The apparatus of claim 13 wherein the second predetermined number is 120.

15. The apparatus of claim 12 wherein the first predetermined number of symbols is 120.

16. The apparatus of claim 15 wherein the second predetermined number is 48.

17. The apparatus of claim 12 wherein the second predetermined number of symbols is 120.

18. The apparatus of claim 17 wherein the first predetermined number is 216, and wherein the number of times is three.

19. The apparatus of claim 12 wherein the second predetermined number of symbols is 48.

20. The apparatus of claim 19 wherein the first predetermined number is 120, and wherein the number of times is six.

21. The apparatus of claim 12 wherein the number of times is based on a number of code symbols in the frame of code symbols.

22. The apparatus of claim 12 wherein the second predetermined number of symbols is based on the number of code symbols in the frame of code symbols.

23. A transmitter apparatus comprising:

means for interleaving a frame of code symbols to produce a sequence of interleaved symbols having a first predetermined number of symbols; and

means for repeating the sequence of interleaved symbols at least once and for additionally repeating a subset of the sequence of interleaved symbols, wherein the subset has a second predetermined number of symbols, and wherein the second predetermined number of symbols is less than the first predetermined number of symbols.