Receiving station with interference signal suppression
First Claim
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1. An optimum combining processor, including:
- a) a combiner coefficient processor, including;
i) a fading coefficient estimation module;
ii) a first interpolation module, coupled to the fading coefficient estimation module;
iii) an autocorrelation estimation module;
iv) a second interpolation module, coupled to the autocorrelation estimation module;
v) an inversion module, coupled to the interpolation module; and
vi) a combining coefficient evaluation module, coupled to the inversion module and to the first interpolation module; and
b) at least one optimum combiner, each optimum combiner coupled to the combiner coefficient processor and including;
i) a plurality of two input multiplication modules, each having an output, the first input of each multiplication module being configured to receive a signal from one of a plurality of fingers of a rake receiver, the second input of each multiplication module being coupled to the combining coefficient evaluation module to receive a combining coefficient; and
ii) a summing module having a number of inputs equal to the number of two input multiplication modules, each of the inputs being coupled to the output of a corresponding one of the multiplication modules.
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Abstract
An optimum combiner that reduces the amount of interference imposed upon a first base station by transmissions of other base stations within the same communication system. Two antennas are used to receive transmissions within a receiving station. A rake receiver is coupled to each antenna. By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna and a finger associated with the second antenna can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients.
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Citations
13 Claims
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1. An optimum combining processor, including:
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a) a combiner coefficient processor, including;
i) a fading coefficient estimation module;
ii) a first interpolation module, coupled to the fading coefficient estimation module;
iii) an autocorrelation estimation module;
iv) a second interpolation module, coupled to the autocorrelation estimation module;
v) an inversion module, coupled to the interpolation module; and
vi) a combining coefficient evaluation module, coupled to the inversion module and to the first interpolation module; and
b) at least one optimum combiner, each optimum combiner coupled to the combiner coefficient processor and including;
i) a plurality of two input multiplication modules, each having an output, the first input of each multiplication module being configured to receive a signal from one of a plurality of fingers of a rake receiver, the second input of each multiplication module being coupled to the combining coefficient evaluation module to receive a combining coefficient; and
ii) a summing module having a number of inputs equal to the number of two input multiplication modules, each of the inputs being coupled to the output of a corresponding one of the multiplication modules. - View Dependent Claims (2, 3)
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4. An optimum combining processor, including:
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a) a combiner coefficient processor, including;
i) a fading coefficient estimation module;
ii) an autocorrelation estimation module;
iii) an inversion module, coupled to the autocorrelation estimation module; and
iv) a combining coefficient evaluation module, coupled to the inversion module and to the first interpolation module;
v) an interpolation module, coupled to the evaluation module; and
b) at least one optimum combiner, each optimum combiner coupled to the interpolation module and including;
i) a plurality of two input multiplication modules, each having an output, the first input of each multiplication module being configured to receive a signal from one of a plurality of fingers of a rake receiver, the second input of each multiplication module being coupled to the interpolation module to receive a combining coefficient; and
ii) a summing module having a number of inputs equal to the number of two input multiplication modules, each of the inputs being coupled to the output of a corresponding one of the multiplication modules. - View Dependent Claims (5, 6)
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7. A receiving station, including:
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a) a first antenna;
b) a first receiver module, coupled to the first antenna;
c) a second antenna;
d) a second receiver module, coupled to the second antenna;
e) an optimum combining processor, coupled to the first receiver module and to the second receiver module, the optimum combining processor including;
i) a combiner coefficient processor, including;
(1) a fading coefficient estimation module;
(2) a first interpolation module, coupled to the fading coefficient estimation module;
(3) an autocorrelation estimation module;
(4) a second interpolation module, coupled to the autocorrelation estimation module;
(5) an inversion module, coupled to the interpolation module; and
(6) a combining coefficient evaluation module, coupled to the inversion module and to the first interpolation module; and
ii) at least one optimum combiner, each optimum combiner coupled to the combiner coefficient processor and including;
(1) a plurality of two input multiplication modules, each having an output, the first input of each multiplication module being configured to receive a signal from one of a plurality of fingers of a rake receiver, the second input of each multiplication module being coupled to the combining coefficient evaluation module to receive a combining coefficient; and
(2) a summing module having a number of inputs equal to the number of two input multiplication modules, each of the inputs being coupled to the output of a corresponding one of the multiplication modules. - View Dependent Claims (8, 9)
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10. A receiving station, including:
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a) a first antenna;
b) a first receiver module, coupled to the first antenna;
c) a second antenna;
d) a second receiver module, coupled to the second antenna; and
e) an optimum combining processor, coupled to the first receiver module and to the second receiver module, the optimum combining processor including;
i) a combiner coefficient processor, including;
(1) a fading coefficient estimation module;
(2) an autocorrelation estimation module;
(3) an inversion module, coupled to the autocorrelation estimation module; and
(4) a combining coefficient evaluation module, coupled to the inversion module and to the first interpolation module; and
(5) an interpolation module, coupled to the evaluation module; and
ii) at least one optimum combiner, each optimum combiner coupled to the interpolation module and including;
(1) a plurality of two input multiplication modules, each having an output, the first input of each multiplication module being configured to receive a signal from one of a plurality of fingers of a rake receiver, the second input of each multiplication module being coupled to the interpolation module to receive a combining coefficient; and
(2) a summing module having a number of inputs equal to the number of two input multiplication modules, each of the inputs being coupled to the output of a corresponding one of the multiplication modules. - View Dependent Claims (11, 12)
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13. A method for combining signals received at a receiving station, including the steps of:
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a) receiving desired signals from a source over two antennas;
b) estimating a cross-correlation between the received desired signals and the symbols encoded in the received desired signals;
c) estimating an autocorrelation matrix;
d) calculating an optimum combining coefficient in response to estimating the cross-correlation and the autocorrelation matrix;
e) combining the desired signals using the optimum combining coefficient; and
f) calculating a signal to interference ratio of a result of combining the desired signals.
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Specification