DS/CDMA receiver using moving-averaged pilot signals for weighting and phase rotation of orthogonal data symbol vectors
First Claim
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1. A direct sequence spread spectrum receiver comprising:
- first correlator means multiplying in-phase and quadrature spread data signals and in-phase and quadrature spread pilot signals with orthogonal despreading sequences at a chip rate to produce in-phase and quadrature orthogonal despread data signals and in-phase and quadrature despread pilot signals;
data integrator means integrating the in-phase and quadrature despread data signals at a symbol rate to produce in-phase and quadrature data symbols;
pilot integrator means integrating the in-phase and quadrature despread pilot signals at said symbol rate to produce in-phase and quadrature pilot symbols;
first and second moving average means successively summing a predetermined number of the in-phase and quadrature pilot symbols to produce first and second moving average values, respectively;
first and second multiplier means multiplying the in-phase and quadrature data symbols of the data integrator means with the first and second moving average values, respectively; and
means summing output signals of the first and second multiplier means.
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Abstract
In a direct sequence spread spectrum receiver, spread orthogonal data signals and spread orthogonal pilot signals are correlated with orthogonal despreading sequences at a chip rate. These despread signals are integrated at a symbol rate to produce orthogonal data symbols and orthogonal pilot symbols. A predetermined number of pilot symbols of each phase component are moving-averaged. Each phase component of the orthogonal data symbols is weighted with the moving average value of the corresponding phase component of the pilot symbols, and summed with the other weighted component of the data symbols to produce an output signal of the spread spectrum receiver.
108 Citations
16 Claims
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1. A direct sequence spread spectrum receiver comprising:
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first correlator means multiplying in-phase and quadrature spread data signals and in-phase and quadrature spread pilot signals with orthogonal despreading sequences at a chip rate to produce in-phase and quadrature orthogonal despread data signals and in-phase and quadrature despread pilot signals; data integrator means integrating the in-phase and quadrature despread data signals at a symbol rate to produce in-phase and quadrature data symbols; pilot integrator means integrating the in-phase and quadrature despread pilot signals at said symbol rate to produce in-phase and quadrature pilot symbols; first and second moving average means successively summing a predetermined number of the in-phase and quadrature pilot symbols to produce first and second moving average values, respectively; first and second multiplier means multiplying the in-phase and quadrature data symbols of the data integrator means with the first and second moving average values, respectively; and means summing output signals of the first and second multiplier means. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A direct sequence spread spectrum receiver comprising:
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a plurality of demodulators; and an adder connected to outputs of said demodulators, each of said demodulators comprising; first correlator means multiplying in-phase and quadrature spread data signals and in-phase and quadrature spread pilot signals with orthogonal despreading sequences at a chip rate to produce in-phase and quadrature despread data signals and in-phase and quadrature despread pilot signals; data integrator means integrating the in-phase and quadrature despread data signals at a symbol rate to produce in-phase and quadrature data symbols; pilot integrator means integrating the in-phase and quadrature despread pilot signals at said symbol rate to produce in-phase and quadrature pilot symbols; first and second moving average means successively summing a predetermined number of the in-phase and quadrature pilot symbols to produce first and second moving average values, respectively; first and second multiplier means multiplying the in-phase and quadrature data symbols of the data integrator means with the first and second moving average values, respectively; and means summing output signals of the first and second multiplier means to produce a sum signal and supplying the sum signal to said adder. - View Dependent Claims (8, 9, 10, 11, 12, 14)
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15. A direct sequence spread spectrum receiver comprising:
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correlator for multiplying in-phase and quadrature spread data signals and in-phase and quadrature spread pilot signals with orthogonal despreading sequences at a chip rate to produce in-phase and quadrature orthogonal despread data signals and in-phase and quadrature despread pilot signals; data integrator for integrating the in-phase and quadrature despread data signals at a symbol rate to produce in-phase and quadrature data symbols; pilot integrator for integrating the in-phase and quadrature despread pilot signals at said symbol rate to produce in-phase and quadrature pilot symbols; first and second moving average circuits for successively summing a predetermined number of the in-phase and quadrature pilot symbols to produce first and second moving average values, respectively; first and second multipliers for multiplying the in-phase and quadrature data symbols of the data integrator with the first and second moving average values, respectively; and adder summing output signals of the first and second multipliers.
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16. A direct sequence spread spectrum receiver comprising:
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a plurality of demodulators; and a first adder connected to outputs of said demodulators, each of said demodulators comprising; correlator for multiplying in-phase and quadrature spread data signals and in-phase and quadrature spread pilot signals with orthogonal despreading sequences at a chip rate to produce in-phase and quadrature despread data signals and in-phase and quadrature despread pilot signals; data integrator for integrating the in-phase and quadrature despread data signals at a symbol rate to produce in-phase and quadrature data symbols; pilot integrator for integrating the in-phase and quadrature despread pilot signals at said symbol rate to produce in-phase and quadrature pilot symbols; first and second moving average circuits for successively summing a predetermined number of the in-phase and quadrature pilot symbols to produce first and second moving average values, respectively; first and second multipliers for multiplying the in-phase and quadrature data symbols of the data integrator with the first and second moving average values, respectively; and second adder for summing output signals of the first and second multipliers to produce a sum signal and supplying the sum signal to a first adder.
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Specification