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Adaptive Equalization for SQPSK and SQPR Over Frequency Selective Microwave LOS Channels

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2 Author(s)
P. Bello ; MILCOM, Inc., Needham, MA, USA ; K. Pahlavan

This paper compares the effectiveness of linear and decision feedback equalizers in counteracting the effect of frequency-selective distortion in microwave relay links. A quadratic frequency-selective model of the channel is employed and particular attention is given to channels with a null in the passband. Both staggered QPSK and QPR modems are studied. Performance is studied for error probability and mean squared error. The general conclusion is reached that a decision feedback equalizer is required for robust performance.

Published in:

IEEE Transactions on Communications  (Volume:32 ,  Issue: 5 )