Baseband-controlled passband equalizing arrangement

Details Baseband-controlled passband equalizing arrangement Baseband-controlled passband equalizing arrangement

H - Electricity

04

B

333/27

H04B 3/14 (2006.01) H04L 27/00 (2006.01) H04L 27/01 (2006.01)

Patent

CA 1218712

PHF. 83.532 24 ABSTRACT: A baseband-controlled passband equalizing arrange- ment for correcting carrier-modulated data signals comprises a passband correction circuit having variable elements, demodulation and carrier recovery circuits for converting the corrected modulated signals into baseband data signals, and a control circuit responsive to an estimated error in the base- band signals for controlling the variable elements of the correction circuit. In known arrangements of this type, the modulated signals are sampled before they are applied to in- phase and quadrature equalizer circuits. An improvement avoiding any problems associated with sampling and providing in-phase and quadrature equalizer circuits is achieved by providing for a passband correction circuit, which comprises fixed delays and variable parameter elements of multipliers and phase shifters and which produces a time-continuous passband output signal in response to a time-continuous passband input signal. The values of the variable parameters are not affected by the state of the carrier recovery circuit.

454068

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