Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1994-01-12
1995-10-31
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
H01Q 300
Patent
active
054634032
ABSTRACT:
Alignment of an antenna and a polarizer for the antenna are automatically adjusted and the frequency setting of a frequency-tunable receiver is automatically adjusted while receiving a broadcast communication signal that is forward-error-correction coded by processing the forward-error-correction code of the received signal to measure a channel-bit-error-rate-affected parameter for the received signal; by realigning the antenna and the polarizer from their respective initial positions in response to the measured parameter until the measured parameter is minimized; and by retuning the receiver from its initial frequency setting in response to the measured parameter until the measured parameter is minimized. A Viterbi decoder processes the forward-error-correction code of the received signal to compute path metrics affected by the bit-error rate of the received signal and normalizes the computed path metrics; and a counter counts the normalizations over fixed intervals to measure a path metric normalization rate as the measured parameter.
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patent: 5175558 (1992-12-01), Dupree
patent: 5287115 (1994-02-01), Walker et al.
Morikura et al., "Novel Channel Control Quality Improvement in Satellite Communication Systems Employing High Coding Gain FEC", IEEE Global Telecommunications Conference & Exhibition, Hollywood, Fla., Nov. 28-Dec. 1, 1988, pp. 136-140.
Patent Abstracts of Japan, vol. 14, No. 85, 16 Feb. 1990, JP1296746 (Sony Corp.).
Viterbi and Omura, "Principles of Digital Communication and Coding," McGraw-Hill, Inc., 1979 pp. 258-261.
Moroney Paul
Walker Gordon K.
Blum Theodore M.
Callan Edward W.
General Instrument Corporation
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