Pulse or digital communications – Transceivers
Patent
1996-02-01
1997-02-25
Chin, Stephen
Pulse or digital communications
Transceivers
375260, 375295, 375316, 370484, H04B 138, H04L 516
Patent
active
056065752
ABSTRACT:
In a cellular-telephone-system base-station receiver's channelizer (111), frequency translation of the outputs of a filter bank (FIG. 5) implemented in fast-Fourier-transform circuitry (453,455,460) is achieved by rotating the correspondence between FFT input elements and the filter coefficients by which multipliers (437) multiply incoming samples to produce them. Specifically, a storage-address generator (482) directs that corresponding FFT input elements of successive FFT operations be stored in the same locations in an input-data memory (451). To retrieve those values for use in the DFT operation, however, a fetch-address generator (484) employs a modulo-K adder (488) to impose a changing offset so that the starting address for retrieval of each FFT operation's input record changes between FFT operations by the filter bank's decimation rate M. An FFT-implemented combiner (131) similarly rotates computation values to phase align successive wavelets that it adds together to generate modulated carriers in a multi-channel output signal.
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AirNet Communications Corporation
Chin Stephen
Vo Don
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