Dynamic matched filter bank and its application in multi-channel spread spectrum communication systems
First Claim
1. A system for detecting, tracking and combining a multipath fading signal, wherein said multipath fading signal has a plurality of significant “
- multipath components spanned over a plurality of symbol periods, said system comprising;
a signal register consisting of a plurality of shift registers, coupled to receive said multipath fading signal for capturing a moving section of said multipath fading signal and for providing a plurality of tapped output signals with each tapped output signal taken from a corresponding shift register of said plurality of shift registers, wherein said plurality of shift registers are driven by a sampling clock;
a reference signal generator for producing a plurality of sections of a local reference signal with each section corresponding to one symbol period and held for one symbol period before being updated and with any two adjacent sections of said local reference signal being offset by one symbol period in phase and being different;
a plurality of correlation devices for generating a plurality of correlation signals with each correlation device coupled to receive said plurality of tapped output signals simultaneously and a corresponding section of said plurality of sections of said local reference signal simultaneously for generating a corresponding correlation signal indicating a plurality of similarities between said multipath fading signal and said corresponding section of said plurality of sections of said local reference signal over a symbol period at a plurality of moments determined by said sampling clock;
a signal combiner coupled to receive said plurality of correlation signals for combining said plurality of correlation signals to produce a combined signal according to a multipath profile, wherein said signal combiner combines three or more said correlated signals;
wherein said signal combiners is under the control of a control device andsaid control device coupled to receive said plurality of correlation signals and said combined signal from out of said signal combiner for identifying and updating said multipath profile and generating a control signal to align up said plurality of correlation signals to produce said combined signal.
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Abstract
A dynamic matched filter bank consists of a plurality of matched filters with either the reference signal for each matched filter changes with the time or the input signal to a matched filter is the received signal modified by a different way for a different matched filter. A receiver employed a set of dynamic matched filter banks in a multi-channel spread spectrum communication system consists of a signal register, a block PN generator, a plurality of spreading sequence generators, a plurality of register arrays, a plurality of multiplier arrays, a plurality of matched filters, a plurality of signal combiners, and a controller. The block PN generator generates a section of PN sequence at the end of every symbol period with feedback logic to shift a block of chips each time. A register array captures each section of PN sequence from the block PN generator and delays it for a symbol period. The rest register arrays are in cascade and delay the section of sequence at each of their inputs by one symbol period. The signal register generates a moving section of the received signal. Each of the multiplier arrays multiplies each moving section of the received signal by a section of PN sequence from either the block PN generator or one of the register arrays to provide a input signal to a corresponding matched filter. Each of the matched filter is to find the correlation between the section of its input signal and the section of its reference signal, which is a spreading sequence from a corresponding spreading sequence generator. Each of the signal combiners will combine the components from corresponding matched filters. The controller will monitor the signals from all matched filters and all signal combiners, extract necessary information, and generate various control signals.
5 Citations
20 Claims
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1. A system for detecting, tracking and combining a multipath fading signal, wherein said multipath fading signal has a plurality of significant “
- multipath components spanned over a plurality of symbol periods, said system comprising;
a signal register consisting of a plurality of shift registers, coupled to receive said multipath fading signal for capturing a moving section of said multipath fading signal and for providing a plurality of tapped output signals with each tapped output signal taken from a corresponding shift register of said plurality of shift registers, wherein said plurality of shift registers are driven by a sampling clock; a reference signal generator for producing a plurality of sections of a local reference signal with each section corresponding to one symbol period and held for one symbol period before being updated and with any two adjacent sections of said local reference signal being offset by one symbol period in phase and being different; a plurality of correlation devices for generating a plurality of correlation signals with each correlation device coupled to receive said plurality of tapped output signals simultaneously and a corresponding section of said plurality of sections of said local reference signal simultaneously for generating a corresponding correlation signal indicating a plurality of similarities between said multipath fading signal and said corresponding section of said plurality of sections of said local reference signal over a symbol period at a plurality of moments determined by said sampling clock; a signal combiner coupled to receive said plurality of correlation signals for combining said plurality of correlation signals to produce a combined signal according to a multipath profile, wherein said signal combiner combines three or more said correlated signals;
wherein said signal combiners is under the control of a control device andsaid control device coupled to receive said plurality of correlation signals and said combined signal from out of said signal combiner for identifying and updating said multipath profile and generating a control signal to align up said plurality of correlation signals to produce said combined signal. - View Dependent Claims (2, 3, 4, 5, 6)
- multipath components spanned over a plurality of symbol periods, said system comprising;
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7. A system for detecting, tracking and combining a multipath fading signal, wherein said multipath fading signal has a plurality of significant multipath components spanned over a plurality of symbol periods, said system comprising:
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a signal reform device consisting of a plurality of shift registers for generating a plurality of preprocessed signals, said plurality of shift registers coupled to receive said multipath fading signal for capturing a moving section of said multipath fading signal and for providing a plurality of tapped output signals with each tapped output signal taken from a corresponding shift register of said plurality of shift registers, wherein said plurality of shift registers are driven by a sampling clock; a reference signal generator for producing a plurality of sections of a local reference signal with each section being a portion of said local reference signal corresponding to one symbol period and holding for said plurality of symbol periods before being updated wherein any two adjacent sections of said local reference signal are offset by one symbol period in phase and are different; a plurality of correlation devices for generating a plurality of correlation signals with each correlation device coupled to receive a corresponding section of said plurality of sections of said local reference signal simultaneously and said plurality of preprocessed signals simultaneously for generating a corresponding correlation signal indicating a plurality of similarities between said multipath fading signal and said corresponding section of said plurality of sections of said local reference signal over said plurality of symbol periods at a plurality of moments determined by said sampling clock; a plurality of signal combiners for producing a plurality of combined signals with each signal combiner coupled to receive a corresponding correlation signal for combining said plurality of significant multipath components for a symbol over said plurality of symbol periods according to a multipath profile, wherein said each signal combiner combines three or more said correlated signals;
wherein said signal combiner are under the control of a control device andsaid control device coupled to receive said plurality of correlation signals and said combined signals from said outputs of said signal combiners for identifying and updating said multipath profile and generating a control signal for each signal combiner to align up said plurality of significant multipath components to produce a combined signal. - View Dependent Claims (8, 9, 10, 11)
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12. A multi-channel spread spectrum communication system for detecting, tracking and combining a multipath fading signal, wherein said multipath fading signal has a plurality of significant multipath components with each of a plurality of sequentially transmitted multi-channel symbols spanned over a plurality of symbol periods, said each multi-channel symbol comprising a plurality of sub-channel symbols, said system comprising:
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a signal register consisting of a plurality of shift registers, said plurality of shift registers coupled to receive said multipath fading signal for capturing a moving section of said multipath fading signal and for providing a plurality of tapped output signals with each tapped output signal taken from a corresponding shift register of said plurality of shift registers, wherein said plurality of shift registers are driven by a sampling clock; a first component reference signal generator for producing a plurality of sections of a first local reference signal with each section being a portion of said first local reference signal and corresponding to one symbol period and with any two adjacent sections of said first local reference signal being offset by one symbol period in phase and being different; a second component reference signal generator for generating a plurality of second component reference signals with each second component reference signal corresponding to a sub-channel; a plurality of correlation devices for generating a plurality of correlation signals with each correlation device coupled to receive a corresponding section of said plurality of sections of said first local reference signal simultaneously and a corresponding second component reference signal simultaneously for generating a correlation signal reflecting similarity between said multipath fading signal and a combination signal synthesized from said corresponding section of said plurality of sections of said first local reference signal and said corresponding second component reference signal over a symbol period at a plurality of moments determined by said sampling clock; a plurality of signal combiners for producing a plurality of combined signals according to a multipath profile with each signal combiner coupled to receive a plurality of correlation signals from a plurality of correlation devices coupled to receive a same second component reference signal, wherein said each signal combiner combines three or more said correlated signals;
wherein said signal combiners are under the control of a control device andsaid control device coupled to said plurality of correlation devices and said plurality of signal combiners for identifying and updating said multipath profile and for generating a control signal for each signal combiner to align up said plurality of significant multipath components to produce a combined signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification