FORWARD ERROR CORRECTION SCHEME FOR HIGH RATE DATA EXCHANGE IN A WIRELESS SYSTEM

• US 20090055707A1
• Filed: 04/28/2008
• Published: 02/26/2009
• Est. Priority Date: 04/28/1999
• Status: Active Grant

• Current Assignee: IPR Licensing Incorporated (InterDigital, Inc.)
• Original Assignee: Tantivy Communications Incorporated (InterDigital, Inc.)
• Inventors: Proctor, James A. JR.
• Granted Patent: US 8,045,536 B2
• Time in Patent Office: Days
• US Class Current: 714/758
• 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. A code division multiple access (CDMA) transmitter, the CDMA transmitter comprising:

a forward error correction (FEC) coder configured to receive a source signal, which corresponds to a subframe and includes an appended cyclic redundancy check code (CRC), and to produce an enhanced source signal including data coded with error correction information;

a demultiplexer configured to demultiplex the enhanced source signal;

a plurality of modem processors configured to process respective portions of the enhanced source signal in a plurality of independent channels;

an adder configured to produce an aggregate signal, which is a summation of the enhanced signal processed in the plurality of independent channels; and

a transmitter configured to transmit the aggregate signal.

2. The CDMA transmitter of claim 1, wherein the transmitter is further configured to retransmit the subframe, if it is received in error by a receiver.

3. The CDMA transmitter of claim 1, wherein data of the subframe is associated with a sequence number.

4. The CDMA transmitter of claim 3, wherein the sequence number designates the order in which the subframe is sent over a subchannel.

5. A code division multiple access (CDMA) receiver, the CDMA receiver comprising:

a receiver configured to receive 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, wherein the wireless signal corresponds to a subframe and includes an appended cyclic redundancy check code (CRC);

a plurality of demodulators configured to demodulate an output of the receiver; and

a forward error correction (FEC) decoder to recover a single unitary information signal.

6. The CDMA receiver of claim 5, wherein the transmitter is further configured to retransmit the subframe if it is received in error by a receiver.

7. The CDMA receiver of claim 5, wherein data of the subframe is associated with a sequence number.

8. The CDMA receiver of claim 7, wherein the sequence number designates the order in which the subframe is sent over a subchannel.

9. A signal processor configured to transmit a code division multiple access (CDMA) encoded signal, the signal processor comprising:

a forward error correction (FEC) encoder configured to receive a source signal and to apply an error correction code, wherein the source signal corresponds to a subframe, and the source signal has an appended cyclic redundancy check code (CRC);

a demultiplexer configured to output at least two demultiplexed encoded signals;

a plurality of modem processors, each configured to modulate the at least two demultiplexed encoded signals to produce a respective one of a plurality of transmission code modulated signals;

an adder configured to generate an aggregate signal; and

a transmitter configured to transmit the aggregate signal.

10. The processor of claim 9, wherein the transmitter is further configured to retransmit the subframe if it is received in error by a receiver.

11. The processor of claim 10, wherein data of the subframe is associated with a sequence number.

12. The processor of claim 11, wherein the sequence number designates the order in which the subframe is sent over a subchannel.

13. A method of transmitting a high data rate signal over a wireless radio channel, the method comprising:

enhancing the high data rate signal with a forward error correction (FEC) code, wherein the high data rate signal corresponds to a subframe and includes an appended cyclic redundancy check code (CRC);

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;

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

modulating the aggregate signal.

14. The method of claim 13, further comprising:

retransmitting the subframe if the subframe is received in error by receiver.

15. The method of claim 13, wherein data of the subframe is associated with a sequence number.

16. The method of claim 15, wherein the sequence number designates the order in which the subframe