Shared resource modulator-demodulator circuits for use with vest

Details Shared resource modulator-demodulator circuits for use with vest Shared resource modulator-demodulator circuits for use with vest

1995-11-07

1997-12-02

Chin, Wellington

Pulse or digital communications

Transceivers

Modems

375270, 375277, 455109, 455 84, 327555, H04B 168

Patent

active

056944195

ABSTRACT:
A common transceiver circuit for use as either a modulator or demodulator and that is implemented through a shared resource approach. This approach is particularly, though not exclusively, suited for vestigial sideband (VSB) signals. Specifically, a VSB transceiver circuit (700), through strategically located multiplexing stages, physically re-uses a complex vestigial Nyquist filter (610), a complex mixer (620) and an equalizer (785) during demodulation and modulation. The VSB transceiver also selects a particular configuration of a common complex Hilbert transform circuit (720) for use during either demodulation or modulation. In addition, the same equalizer selectively provides both channel equalization, during de-modulation, and (sin x)/x compensation, during modulation, through use of differing corresponding sets of tap coefficients.

REFERENCES:
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patent: 4882614 (1989-11-01), Kageyama et al.
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patent: 5524124 (1996-06-01), Koenig
patent: 5621455 (1997-04-01), Rogers et al.
Draft Report, VSB Transmission System--Grand Alliance, Technical Details; Dec. 7, 1994.

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