Modulators – Amplitude modulator – Single or vestigial sideband type
Patent
1996-01-25
1997-05-20
Grimm, Siegfried H.
Modulators
Amplitude modulator
Single or vestigial sideband type
329357, 375270, 375301, 375321, H03C 160, H03D 100
Patent
active
056316100
ABSTRACT:
A communication system having a modulation system for transmitting a symbol set via a single side-band modulated carrier and a demodulation system for recovering the in-phase and quadrature signals from the modulated carrier. The modulation circuit receives M symbol values and generates M time domain samples for each of the in-phase and quadrature signals. The in-phase and quadrature signals can then be combined to generate the single side-band modulated carrier. The modulation circuit includes a transform circuit for generating M transformed symbol values by computing the transform of the M symbol values. A polyphase filter bank having 2M FIR filters is used to process the output of the transform circuit. Each filter has g taps, where g is an integer greater than 1. The outputs of the polyphase filters are combined with the outputs of the polyphase filters generated from a previously received set of M symbols to generate the M time-domain signal values of the in-phase signal. The quadrature signal is generated by a similar circuit having two additional elements. The demodulation circuit recovers symbol sets from the in-phase or quadrature signals generated from M received time-domain signal values. The demodulator includes a memory for storing the 2M most recently received time-domain values, a polyphase filter bank, a polyphase processing circuit, and a transform circuit. The demodulation circuit for recovering a symbol set from the quadrature signal is similar to that for recovering the symbol set from the in-phase signal, except that the polyphase processor combines the outputs of the polyphase filters according to a different set of relationships and the sign of every other output from the transform is changed.
REFERENCES:
patent: 3573380 (1971-04-01), Darlington
patent: 4131766 (1978-12-01), Narasimha
Sandberg Stuart
Tzannes Michael
Aware Inc.
Grimm Siegfried H.
Ward Calvin B.
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