Method for recovering data transmitted over a plurality of channels employing wireless code division multiple access communication

• US 20070258412A1
• Filed: 07/03/2007
• Published: 11/08/2007
• Est. Priority Date: 04/22/1993
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kowalski, John, Schilling, Donald
• Application Number:
  US11/824,856
• Publication Number:
  US 20070258412A1
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/71075 Parallel interference cancellation

Abstract

A method for recovering data transmitted over a plurality of channels employing wireless code division multiple access communication, comprises receiving the plurality of channels as a received signal, each channel associated with a code. Others from the plurality of channels from the received signal is subtracted for each for each of the plurality of channels and a result a result of that subtracting as data for that channel is despread. That channel despread signal is respread with a respective channel code, wherein the respreading channel code is aligned to a timing of the despread received signal.

Claims

1. A method for recovering data transmitted over a plurality of channels employing wireless code division multiple access communication, comprising:

a) receiving the plurality of channels as a received signal, each channel associated with a code;

b) subtracting for each of the plurality of channels others of the plurality of channels from the received signal and despreading a result of that subtracting as data for that channel; and

c) respreading that channel despread signal with a respective channel code;

wherein the respreading channel code is aligned to a timing of the despread received signal.

2. The method of claim 1 wherein step (b) includes, for each channel:

despreading the received signal with the others channel codes;

respreading the despread others channel codes using the other channels codes; and

subtracting from the received signal the respread other channels.

3. The method of claim 2 wherein the despreading is performed by a mixer.

4. The method of claim 2 wherein the despreading is performed by a matched filter.