US6868078B2

3G

Title

Base station spread spectrum CDMA subtractive interference canceller

Application Number:

US20020202179

Publication Date:

15-03-2005

Current Assignee:

Family ID:

Application Date:

24-07-2002

Publication Country:

US

Priority Date:

22-04-1993

Declaring Company:

Abstract  Abstract

A spread-spectrum code division multiple access interference canceller for reducing interference in a direct sequence CDMA employed at a base station receiver having N chip-code channels. The interference canceller includes a plurality of correlators or matched filters a plurality of spread-spectrum-processing circuits subtracting circuits and channel correlators or channel-matched filters. Using a plurality of chip-code signals the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals respectively. The spread-spectrum-processing circuits use a timed version of the chip-code signals for spread-spectrum processing the despread signals respectively with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an i th chip-code-signal the subtracting circuits subtracts from the spread-spectrum CDMA signal the N-1 spread-spectrum-processed-despread signals generating a subtracted signal. The N-1 spread-spectrum-processed-despread signals exclude the spread-spectrum-processed-despread signal of the i th channel. The channel correlator or channel-matched filter despreads the subtracted signal.

Note:

The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent

Implicitly disclosed patent

Basis patent

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