Method and apparatus for digitally equalizing a signal in a distributed antenna system
First Claim
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1. A signal processing device within a distributed antenna system, the signal processing device comprising:
- a first radio frequency transceiver providing a first reception signal path, the first reception signal path having an uncompensated distortion function of G1(ω
) with a first system response represented by y1(n), a first compensator coupled to the first reception signal path, the first compensator having a first filter H1(ω
), the first filter H1(ω
) having a first filter parameter vector {right arrow over (h)}1, wherein the first filter parameter vector {right arrow over (h)}1 is determined from a first estimation of the first system response y1(n) of the first reception signal path;
a second radio frequency transceiver providing a second reception signal path, the second reception signal path having an uncompensated distortion function of G2(ω
) with a second system response represented by y2(n), a second compensator coupled to the second reception signal path, the second compensator having a second filter H2(ω
), the second filter H2(ω
), having a second filter parameter vector {right arrow over (h)}2, wherein the second filter parameter vector {right arrow over (h)}2 is determined from a second estimation of the second system response y2(n) of the second reception signal path;
wherein the first filter parameter vector {right arrow over (h)}1 configures the first filter H1(ω
) to produce a first output response that is a first delayed version of a first input to the first filter H1(ω
);
wherein the second filter parameter vector {right arrow over (h)}2 configures the second filter H2(ω
) to produce a second output response that is a second delayed version of a second input to the second filter H2(ω
); and
wherein the first radio frequency transceiver and the second radio frequency transceiver are coupled to a module that multiplexes uplink signals from the first radio frequency transceiver and the second radio frequency transceiver into a serial data stream.
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Abstract
Systems and methods for digitally equalizing a signal in a distributed antenna system are provided. In one embodiment, a signal processing device within a distributed antenna system comprises a signal path within a signal processing board, the signal path having an uncompensated distortion function of G(ω) with a system response represented by y(n); and a compensator coupled to the signal path, the compensator having a finite impulse response (FIR) filter with an impulse response function represented by H(ω), the compensator having an FIR filter parameter vector {right arrow over (h)} determined from an estimated system response y(n) of the signal path to an input comb signal x(n), wherein y(n) is estimated from interpolated measured output responses of the signal path to a plurality of frequency sweep signal test inputs.
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Citations
13 Claims
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1. A signal processing device within a distributed antenna system, the signal processing device comprising:
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a first radio frequency transceiver providing a first reception signal path, the first reception signal path having an uncompensated distortion function of G1(ω
) with a first system response represented by y1(n), a first compensator coupled to the first reception signal path, the first compensator having a first filter H1(ω
), the first filter H1(ω
) having a first filter parameter vector {right arrow over (h)}1, wherein the first filter parameter vector {right arrow over (h)}1 is determined from a first estimation of the first system response y1(n) of the first reception signal path;a second radio frequency transceiver providing a second reception signal path, the second reception signal path having an uncompensated distortion function of G2(ω
) with a second system response represented by y2(n), a second compensator coupled to the second reception signal path, the second compensator having a second filter H2(ω
), the second filter H2(ω
), having a second filter parameter vector {right arrow over (h)}2, wherein the second filter parameter vector {right arrow over (h)}2 is determined from a second estimation of the second system response y2(n) of the second reception signal path;wherein the first filter parameter vector {right arrow over (h)}1 configures the first filter H1(ω
) to produce a first output response that is a first delayed version of a first input to the first filter H1(ω
);wherein the second filter parameter vector {right arrow over (h)}2 configures the second filter H2(ω
) to produce a second output response that is a second delayed version of a second input to the second filter H2(ω
); andwherein the first radio frequency transceiver and the second radio frequency transceiver are coupled to a module that multiplexes uplink signals from the first radio frequency transceiver and the second radio frequency transceiver into a serial data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for processing signals within a Distributed Antenna System (DAS), the method comprising:
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calibrating a compensator for a first reception signal path within a remote unit of the DAS, wherein calibrating comprises estimating a system response y(n) of the first reception signal path based on an application of a plurality of test signals to an input of the first reception signal path; solving for coefficients of a vector h(n) based on a difference between a vector d(n) and a convolution h(n)*y(n), where d(n) is based on a desired delay in the system response y(n) for the first reception signal path; setting coefficients of a filter within the compensator using the coefficients of the vector h(n); multiplexing an output of the first reception signal path with an output of a second reception signal path within the remote unit onto a serial communication link. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification
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Current AssigneeProcomm International Pte. Ltd. (Transpacific IP Group Limited)
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Original AssigneeADC Telecommunications Incorporated (TE Connectivity Limited)
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InventorsWiwel, Bernard K., Brennan, Jeffrey O., Wala, Philip M., Cannon, Jeffrey J., Zavadsky, Dean
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Primary Examiner(s)Vo, Don N
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Application NumberUS13/411,926Publication NumberTime in Patent Office428 DaysField of Search375/219, 375/220, 375/232, 375/350US Class Current375/219CPC Class CodesH04L 25/0232 by interpolation between so...H04L 25/03133 with a non-recursive struct...H04L 27/01 Equalisers baseband equaliz...
