Process for the transmission of service signals for a digital ra

Details Process for the transmission of service signals for a digital ra Process for the transmission of service signals for a digital ra

1981-11-06

1984-01-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

3701104, 375122, 381 34, H04B 166

Patent

active

044267118

ABSTRACT:
To transmit the service signals of a digital radio beam, the carrier is modulated in accordance with a supplementary state in a special modulator when two successive data words are identical. On reception a special demodulator detects the transmission of a service bit having a value 1. The transmission of a service bit having a value 0 takes place by the detection in a comparator of two successive identical data words simultaneously with the detection of the non-transmission of the supplementary state. This supplementary modulation state advantageously corresponds to the elimination of the carrier.

REFERENCES:
patent: 3603725 (1971-09-01), Cutler
patent: 3609244 (1971-09-01), Mounts
patent: 3624306 (1971-01-01), Myers
patent: 3720786 (1973-03-01), Cutler
patent: 4259693 (1976-06-01), Aaron et al.
Kortman, "Redundancy Reduction-A Practical Method of Data Compression", IEEE Proceeding, vol. 55, No. 3, Mar. 1967, pp. 253-262.

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