Automatic adjustment of receiver apparatus based on channel-bit-

Details Automatic adjustment of receiver apparatus based on channel-bit- Automatic adjustment of receiver apparatus based on channel-bit-

1992-07-10

1994-02-15

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including antenna orientation

H01Q 300

Patent

active

052871150

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 unitl the measured parameter is minimized. A Viterbi decoder processes the forward-error-correction code of the received signal to compute path metrics affected 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.

REFERENCES:
patent: 4744083 (1988-05-01), O'Neill et al.
patent: 4796032 (1989-01-01), Sakurai et al.
Viterbi and Omura, "Principles of Digital Communication and Coding," McGraw-Hill, Inc., 1979, pp. 258-261.

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