QAM receiver having joint gain, carrier recovery and...

Details QAM receiver having joint gain, carrier recovery and... QAM receiver having joint gain, carrier recovery and...

2006-08-01

2006-08-01

Vo, Don N. (Department: 2631)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07085328

ABSTRACT:
A quadrature amplitude modulation (QAM) receiver digitizes an analog QAM signal representing a transmitted sequence of complex elements to produce a digital waveform sequence representing amplitudes of successive samples of the QAM signal. The QAM receiver employs a digital signal processing (DSP) circuit to process the digital waveform sequence to produce a soft decision sequence of complex elements, each of value that is a higher resolution approximation of a value of a corresponding transmitted sequence element. A pair of slicers then convert each soft decision sequence element into a lower resolution hard decision sequence element matching the corresponding complex element of the transmitted sequence. In processing the digital waveform sequence, the DSP circuit provides quadrature demodulation with a demodulation phase angle controlled by a control data sequence θnprovides a gain controlled by control data gnand provides equalization using a set of equalization filter coefficients, each ithfilter coefficient being of value controlled by separate control data fi. DSP circuit adjusts control data sequence θnand control data gnand fiin accordance with separate algorithms, but the algorithms all minimize the same cost function relative to the soft and hard decision sequences.

REFERENCES:
patent: 3962637 (1976-06-01), Motley et al.
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 5386239 (1995-01-01), Wang et al.
patent: 5555534 (1996-09-01), Maslak et al.
patent: 5754591 (1998-05-01), Samueli et al.
patent: 6819514 (2004-11-01), Behrens et al.

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