Forward error correction scheme for high rate data exchange in a wireless system

• US 6,614,776 B1
• Filed: 04/28/1999
• Issued: 09/02/2003
• Est. Priority Date: 04/28/1999
• Status: Expired due to Term

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: Tantivy Communications Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A. Jr.
• Primary Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US09/301,484
• Time in Patent Office: 1,588 Days
• Field of Search: 370/320, 370/328, 370/329, 370/334, 370/335, 370/342, 370/441, 370/535, 370/536, 370/541, 370/542, 375/135, 375/136, 375/137, 375/149, 375/141, 375/146
• US Class Current: 370/342
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes

Abstract

A transmitter/receiver system for high data transfer in a wireless communication system includes a physical layer processor that comprises an FEC coder, a demultiplexer and a plurality of modem processors. The FEC coder applies error correction codes to the high data rate signal. Thereafter, the demultiplexer distributes portions of the coded high data rate signal to the modem processors. Each modem processor processes its respective portion of the coded signal for transmission in an independent channel.

Claims

1. In a CDMA (Code Division Multiple Access) transmitter, a physical layer processor comprising:

a source signal including data;

an FEC (Forward Error Correction) coder to receive the source signal and produce an enhanced source signal including data coded with error correction information;

a demultiplexer coupled to receive the enhanced source signal from the FEC coder;

a plurality of modem processors, each of which is coupled to a unique output of the demultiplexer to process respective portions of the enhanced source signal in independent channels;

an adder coupled to receive outputs of the modem processors to produce an aggregate signal, the aggregate signal being a summation of the enhanced signal processed in independent channels; and

a transmitter to transmit the aggregate signal over a carrier frequency.

2. The CDMA transmitter of claim 1 provided in a base station of a CDMA communication system.

3. The CDMA transmitter of claim 1 provided in a subscriber station of a CDMA communication system.

4. The CDMA transmitter of claim 1, wherein the FEC coder operates according to an iterative systematic nested code.

5. The CDMA transmitter of claim 1, wherein the FEC coder operates according to a turbo product code.

6. The CDMA transmitter of claim 1, wherein the FEC coder according to a convolutional turbo code.

7. An apparatus as in claim 1, wherein the aggregate signal is modulated onto a common carrier frequency.

8. In a CDMA receiver, a physical layer processor comprising:

a receiver that receives a wireless signal from a transmitter, the wireless signal being formed at the transmitter by a summation of portions of a coded signal that were processed in independent channels but were wirelessly transmitted as a single aggregate signal;

a plurality of demodulators coupled to receive an output of the receiver; and

a multiplexer coupled to direct an output of the demodulators to an FEC (Forward Error Correction) decoder to recover a single unitary information signal.

9. The CDMA receiver of claim 8 provided in a base station of a CDMA communication system.

10. The CDMA receiver of claim 8 provided in a subscriber station of a CDMA communication system.

11. The CDMA receiver of claim 8, wherein the FEC decoder operates according to an iterative systematic nested code.

12. The CDMA receiver of claim 8, wherein the FEC decoder operates according to a turbo product code.

13. The CDMA receiver of claim 8, wherein the FEC coder according to a convolutional turbo code.

14. An apparatus as in claim 8, wherein the aggregate signal is modulated onto a common carrier frequency.

15. A physical layer signal processor for use in transmitting a Code Division Multiple Access (CDMA) encoded signal, the signal processor comprising:

a Forward Error Correction (FEC) encoder, connected to receive a source signal, and to apply an error correction code;

a demultiplexer in communication with the FEC encoder, the demultiplexer outputting two or more demultiplexed encoded signals;

a plurality of modem processors, each receiving a respective one of the plurality of the demultiplexed encoded signals, the modem processors each modulating a respective one of the demultiplexer outputs applied thereto to produce a respective one of a plurality of transmission code modulated signals, the signal processor further characterized by;

an adder that is connected to receive the plurality of transmission code modulated signals to thereby produce an aggregate signal; and

a transmitter connected to receive the aggregate signal output by the adder, for producing an aggregate transmitted signal.

16. The processor of claim 15 provided in a base station of a CDMA communication system.

17. The processor of claim 15 provided in a subscriber station of a CDMA communication system.

18. The processor of claim 15, wherein the FEC encoder operates according to an iterative systematic nested code.

19. The processor of claim 15, wherein the FEC encoder operates according to a turbo product code.

20. The processor of claim 15, wherein the FEC encoder encodes according to a convolutional turbo code.

21. A method for transmitting a high data rate signal over a wireless radio channel comprising the steps of:

enhancing the high data rate signal with the Forward Error Correction (FEC) code;

distributing the enhanced high data rate signal over a plurality of demultiplexed signals;

encoding each of the plurality of demultiplexed signals with a Code Division Multiple Access (CDMA) transmission code;

characterized by the additional steps of;

summing the plurality of CDMA transmission encoded signals to produce an aggregate signal; and

modulating the aggregate signal, to produce a transmitted signal.

22. The method of claim 21 in which the transmitted signal is provided to a base station of a CDMA communication system.

23. The method of claim 21 in which the transmitted signal is provided to a subscriber station of a CDMA communication system.

24. The method of claim 21, wherein the FEC decoder operates according to an iterative systematic nested code.

25. The method of claim 21, wherein the FEC decoder operates according to a turbo product code.

26. The method of claim 21, wherein the FEC decoder operates according to a convolutional turbo code.