Apparatus and methods for intersymbol interference...

Details Apparatus and methods for intersymbol interference... Apparatus and methods for intersymbol interference...

2005-12-13

2005-12-13

Tran, Khai (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000

Reexamination Certificate

active

06975672

ABSTRACT:
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.

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