Multirate receive device and method using a single adaptive interpolation filter
First Claim
1. Device for receiving a source digital signal transmitted at one or more source symbol frequencies Fs, comprising:
- means for sampling a received analog signal transposed into the baseband delivering an entirely demodulated sample signal, said sampling means operating at a sampling frequency Fe complying with the generalized sampling condition, anda single filter module filtering said sampled signal, said filter module comprising;
a digital filter controlled by a filter coefficient vectors, andmeans for determining said filter coefficients according to a determination criterion based on both (i) the ratio of said sampling frequency Fe to said source symbol frequency Fs, to interpolate said sampled signal, and (ii) an analysis of a transmission path, in order to limit interference introduced by said path.
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Abstract
A device for receiving a source digital signal transmitted at one or more source symbol frequencies Fs samples a received analog signal transposed into the baseband and delivers an entirely demodulated sample signal. The sampling frequency Fe complies with the generalized sampling condition. A single filter module filtering the sampled signal comprises a digital filter controlled by a filter coefficient vector. The filter coefficients are determined according to a determination criterion allowing for the ratio of the sampling frequency Fe to the source frequency Fs, to interpolate the sampled signal, and for an analysis of the transmission path, in order to limit interference introduced by the path.
118 Citations
19 Claims
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1. Device for receiving a source digital signal transmitted at one or more source symbol frequencies Fs, comprising:
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means for sampling a received analog signal transposed into the baseband delivering an entirely demodulated sample signal, said sampling means operating at a sampling frequency Fe complying with the generalized sampling condition, and a single filter module filtering said sampled signal, said filter module comprising; a digital filter controlled by a filter coefficient vectors, and means for determining said filter coefficients according to a determination criterion based on both (i) the ratio of said sampling frequency Fe to said source symbol frequency Fs, to interpolate said sampled signal, and (ii) an analysis of a transmission path, in order to limit interference introduced by said path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Method of receiving a source digital signal transmitted at a source symbol frequency Fs selected from a plurality of possible source symbol frequencies, said method being performed subsequent to sampling a received analog signal transposed into the baseband and delivering a sampled signal and prior to decoding to reconstruct said source digital signal,
said sampling being carried out at a fixed sampling frequency Fe complying with Shannon'"'"'s sampling theorem, said method using a single filter to filter said sampled signal and to supply a filtered signal for said decoding, comprising: -
an initialization step of determining a series of sets of filter coefficient vectors, each set corresponding to a given source symbol frequency Fs, and each vector corresponding to a given receive situation, and a step of filtering a received source signal, comprising choosing the filter coefficient vector most accurately synchronized to correct the effects of a transmission path and/or of asynchronous sampling from the set of vectors corresponding to the source symbol frequency of said source signal. - View Dependent Claims (19)
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Specification