Fractional sample/symbol time modulator

Details Fractional sample/symbol time modulator Fractional sample/symbol time modulator

H - Electricity

04

L

H04L 27/32 (2006.01) G06F 1/03 (2006.01) H04L 27/12 (2006.01)

Patent

CA 2111785

ABSTRACT OF THE DISCLOSURE A modulator capable of providing a fractional sample or symbol time employs a decimation counter (23) responsive to a clock having a frequency equal to M/Nx (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.

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