Increasing performance in modems in presence of noise

Details Increasing performance in modems in presence of noise Increasing performance in modems in presence of noise

2005-11-15

2005-11-15

Burd, Kevin (Department: 2631)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

06965638

ABSTRACT:
A digital communications system with a built-in apparatus for improving receive path performance in the presence of noise. An analog datastream is provided to a hardware receive filter that rejects signals lying outside a frequency spectrum of interest, while a hardware equalizer flattens the channel response. An analog-to-digital converter digitizes the filtered and equalized analog datastream into a digital bitstream, which is then filtered, further channel-equalized and demodulated. The system also includes a memory, an estimator unit, having a first input coupled to the memory and a second input coupled to a data input, and an output coupled to a compute unit. The estimator unit is adapted to providing estimates of signal power, channel noise and channel response. The compute unit, has an input coupled the estimator unit and an output coupled to the memory, and is adapted to computing a channel capacity based the selected combination of modem parameters.

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