Remote unit multichannel CDMA subtractive interference canceller

• US 7,167,462 B2
• Filed: 06/06/2002
• Issued: 01/23/2007
• Est. Priority Date: 04/22/1993
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Schilling, Donald L., Kowalski, John
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): Boakye; Alexander O.
• Application Number:
  US10/164,209
• Publication Number:
  US 20020167925A1
• Time in Patent Office: 1,692 Days
• Field of Search: 370/335, 370/342, 370/201, 370/310, 370/333, 370/331, 370/479, 370/343, 370/464, 370/441
• 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

Apparatus employed by a remote unit wherein a plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.

Claims

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

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

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

for each channel, a first mixer operatively coupled to the input for despreading the received signal with that channel code; and

for each channel, a second mixer for 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; and

wherein for each channel, the subtractor subtracts from the received signal the respread channels other than that channel.

2. A remote unit receiver for recovering data transmitted over a plurality of channels employing a wireless code division multiple access communication technique, comprising:

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

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

for each channel, a matched filter operatively coupled to the receiving unit for despreading the received signal with that channel code; and

for each channel, a mixer for 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; and

wherein for each channel, the subtractor subtracts from the received signal the respread channels other than that channel.