APPARATUS AND METHOD FOR INTERSYMBOL INTERFERENCE COMPENSATION IN SPREAD SPECTRUM COMMUNICATIONS SYSTEMS

WIPO Patent Application WO2003026145

A3

A communications signal representing symbols encoded according to respective portions of a spreading sequence is decoded. Time-offset correlations of the communications signal with the spreading sequence are generated. The time-offset correlations are combined to generate first estimates for the symbols. Intersymbol interference factors that include a relationship among different portions of the spreading sequence are determined, and a second estimate for one of the symbols is generated from the first estimates based on the determined intersymbol interference factors. An intersymbol interference factor may include a relationship between a first portion of the spreading sequence associated with the one symbol to a second portion of the spreading sequence associated with another symbol and may be determined, for example, from the spreading sequence and a channel estimate for a channel over which the communications signal is communicated. The invention may be embodied as methods and apparatus, for example, as a receiver included in a communications apparatus, such as a wireless terminal, wireless base station, or other wireless, wireline or optical communications apparatus.

BOTTOMLEY GREGORY EDWARD (US)
OTTOSSON TONY (SE)
WANG YI-PIN ERIC (US)

PCT/US2001/049165

May 15, 2003

December 19, 2001

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ERICSSON INC (US)
BOTTOMLEY GREGORY EDWARD (US)
OTTOSSON TONY (SE)
WANG YI-PIN ERIC (US)

H04L25/03; (IPC1-7): H04L25/03; H04B1/707

US5483557A	1996-01-09
US5889827A	1999-03-30
EP1065793A2	2001-01-03
US5966415A	1999-10-12
US6148023A	2000-11-14

See also references of EP 1350328A2

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