Channel equalisation

Details Channel equalisation Channel equalisation

2008-04-22

2008-04-22

Payne, David C. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S150000

Reexamination Certificate

active

07362794

ABSTRACT:
A method of reducing multiple access interference in a CDMA radio system uses a plurality of rake fingers to pre-process received signals but without demodulation or de-spreading. The outputs of the rake fingers are combined, normalised and then processed by an adaptive equaliser to recover orthogonality lost in transmission. The equaliser output is then subject to de-spreading and de-scrambling to recover the desired user signals. The equaliser is preferably adaptive order, the length being adapted in dependence upon the instantaneous signal to noise ratio.

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