Pulse or digital communications – Repeaters – Testing
Patent
1993-08-13
1995-08-15
Cangialosi, Salvatore
Pulse or digital communications
Repeaters
Testing
H04B 169
Patent
active
054426618
ABSTRACT:
A coherent RAKE receiver utilizes a "blind block" path gain estimation scheme, based on a maximum likelihood criterion, to estimate path gains in the receiver. It is "blind" in that preliminary hard decisions on coded bits (i.e., coded bits from the corrupt transmitted signal) are not used. Instead, a form of soft decisions are used. It is a "block" scheme in that the complex path gains are estimated for an isolated block, for example a block of B correlator outputs. The path gains varying with time are approximated to be linear in time such that the average path gain and the slope of the path gain per path can be utilized to estimate the path gain. The path gain estimation scheme overcomes the shortcomings of typical CDMA systems where there is no assurance of continuous transmission (except for full-rate 9600 b/s transmission) upon which to base a FIR filter-type prediction scheme.
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Cangialosi Salvatore
Motorola Inc.
Sonnentag Richard A.
Warren Raymond J.
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