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COHERENT WEIGHT COMBINING UNIT FOR A CDMA MULTIPATH SIGNAL RECEIVER

IP.com Disclosure Number: IPCOM000020020D
Original Publication Date: 2003-Oct-17
Included in the Prior Art Database: 2003-Oct-17
Document File: 2 page(s) / 29K

Publishing Venue

Motorola

Related People

Nickolai Sidorov: AUTHOR

Abstract

This paper describes a signal processing method that can be implemented on CDMA multipath signal receivers to perform coherent weight combining of all multipath components. This method allows the use of one correlator to combine all multipath components coherently.

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COHERENT WEIGHT COMBINING UNIT FOR A CDMA MULTIPATH SIGNALRECEIVER

Nickolai Sidorov

ABSTRACT

This paper describes a signal processing method that can be implemented on CDMA multipath signal receivers to perform coherent weight combining of all multipath components. This method allows the use of one correlator to combine all multipath components coherently.

PROBLEMS ENCOUNTERED BY A CDMA RECEIVER:

A typical CDMA receiver uses a Rake receiver method. In accordance with CDMA Standards (TIA/EIA-95-B, TIA/EIA/IS-2000.2-A) this CDMA receiver shall have at least three elements and must be capable of tracking and demodulating multipath components of the Forward CDMA Channel and at least four elements for demodulating of the Reverse CDMA Channel. It follows that this Rake receiver has at least three correlators for the demodulating of the Forward CDMA Channel and at least four correlators for demodulating the Reverse CDMA Channel and combining only three or four multipath components.

THE PROBLEMS SOLVED BY THIS METHOD

This suggested method allows a combination of all multipath components into one correlator.

THEORY OF OPERATION

The suggested solution is based on the following principles (example for a CDMA mobile station): firstly to measure the complex impulse response of the Forward Channel by Pilot Channel analysis, secondly to use the measured impulse response to form a multipath signal pattern that will be used in the Forward Channel (Sync Channel, Paging Channel, Traffic Chann...