Modulator having fractional sample/symbol time

Details Modulator having fractional sample/symbol time Modulator having fractional sample/symbol time

1992-12-22

1994-11-01

Mis, David

Modulators

Frequency shift keying modulator or minimum shift keying...

332101, 332103, 332104, 375 45, 375 52, 375 62, 375 67, H03C 300, H04L 2700, H04L 2712, H04L 2718

Patent

active

053610466

ABSTRACT:
A modulator capable of providing a fractional sample or symbol 995486 time employs a decimation counter (23) responsive to a clock having a frequency equal to M/N.times.(data symbol clock), where M is an interpolation factor and N is a decimation factor, for generating a data symbol clock to select FSK symbols from a sampled data array (21). A multiplier (26) receives the FSK symbols and multiplies the symbols by a weighting factor determined by the decimation counter. When the decimation counter wraps around due to a modulo M operation, a fractional weight is calculated for the current FSK symbol, then a new FSK symbol is selected, and then a fractional weight is calculated for the new FSK symbol. When the decimation counter has not wrapped, the full weighting, N, is output for the current FSK symbol.

REFERENCES:
patent: 4962510 (1990-10-01), McDavid et al.
patent: 5016259 (1991-05-01), Hershberger
patent: 5022054 (1991-06-01), Wang

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