Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1980-12-17
1983-02-08
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455273, 455 12, H04B 708
Patent
active
043732070
ABSTRACT:
In a diversity signal combiner, the weaker of the two signals is attenuated an amount that varies as a function of the phase angle between the two signals. When the phase angle is small, the attenuation is small and the two signals add together. As the phase angle increases, the attenuation of the smaller of the two signals increases. For phase angles between 90 and 270 degrees, the contribution of the smaller signal is negligible. In digital systems, improvements in the bit error rate can be realized by introducing a 180 degree relative phase shift in the wavepath of the weaker signal whenever the phase angle exceeds a specified threshold.
REFERENCES:
patent: 3044062 (1962-07-01), Katzin
patent: 3341778 (1967-09-01), Dryden
patent: 3430156 (1969-02-01), Katzin
patent: 3528012 (1970-09-01), Kahn
patent: 3902119 (1975-08-01), Skingley
patent: 3965422 (1976-06-01), Tagliaferri
patent: 4160952 (1979-07-01), Seastrand
A Correlation Audio Combiner for use with H. F. Diversity Receivers, by D. E. Susans, Communications 78-Conference on Communications Equipment and Systems, Birmingham, England (Apr. 4-7, 1978), pp. 286-288.
Bell Telephone Laboratories Incorporated
Chin Tommy P.
Sherman S.
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