# US 7,167,462 B2 · Remote unit multichannel CDMA subtractive interference canceller

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- Number: US 7,167,462 B2
- Document ID: US7167462B2
- Status: Granted
- Kind: B2
- Application number: 10/164,209
- Filed: 2002-06-06
- Published: 2002-11-14
- Granted: 2007-01-23
- Earliest claimed: 1993-04-22
- Assignees: InterDigital Technologies Corporation
- Inventors: Donald L. Schilling; John Kowalski
- Web page: https://patentgrep.com/patent/US7167462B2

## CPC

- H04B 1/71075: {Parallel interference cancellation}
- H04B 1/709: Correlator structure
- H04B 1/7093: Matched filter type
- H04B: TRANSMISSION

## 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

### Claim 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.

### Claim 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.