System to generate switching criteria and equalize adaptively in

Details System to generate switching criteria and equalize adaptively in System to generate switching criteria and equalize adaptively in

1990-10-26

1994-02-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375102, 4552263, 455304, H04B 112

Patent

active

052854736

ABSTRACT:
A system for detecting data spectrum distortion in a transmitted signal, in particular distortion caused by selective fading. The system includes: two blocks in parallel, which act on the spectrum average power of the input signal in an equal but opposite manner (i.e. they have equal slopes but act with opposite effect on the amplitude of the input signal versus frequency); two detectors which detect the average power output from the two respective blocks, each being associated with one of the blocks; and one comparitor for comparing the outputs of the two detectors. The system allows one to detect the asymmetries of the data spectrum and, by adding an AGC and a reference voltage, information related to the notch frequency f.sub.o is also obtained. The distortion measurement obtained in this manner allows one to generate a switching criterion, as a countermeasure for selective fadings in the transmitted signal.

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G. L. Fenderson et al., "Recent Advances in Multipath Propogation Countermeasures for High-Capacity Digital Radio Systems", Proceedings of the 1985 IEEE International Conference on Communications, Jun. 23-26, 1985, vol. 3, pp. 1239-1243, NY, NY.
J. L. Osterholz, "Selection Diversity Combiner Design for Digital LOS Radios", IEEE Transactions on Communication Technology, vol. 27, No. 1, Jan. 1979, New York.

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