Anti-multipath digital signal detector

Telegraphy – Code transmitters – Rotary contact

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325323, 325349, 325476, 2351501, 235156, H04L 1524, H04B 110, G06F 1536

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039846342

ABSTRACT:
The invention is a detector for radio signals which have been transmitted through a multipath medium. The device operates in conjunction with the radio frequency portion of a receiver to detect digital signals which have been transmitted in known modulation formats. The transmitted signal is constructed by assigning known and distinct modulation waveforms to a sequence of message symbols, or digits. The basic digital message, which the detector is to reconstruct consists of a sequence of digits, each lasting for a fixed time, say T seconds, and each picked from an alphabet of arbitrary, but fixed, size. For example, in a binary message, the alphabet consists of the digits 0 and 1. In a quarternary message, the alphabet consists of the digits 0, 1, 2 and 3.

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patent: 3490040 (1970-01-01), Choquet et al.
patent: 3551816 (1970-12-01), Paine
patent: 3614626 (1971-10-01), Dillard
patent: 3736507 (1973-05-01), Wolejsza, Jr. et al.
Gooding: Performance Monitor Techniques for Digital Receivers Based on Extrapolation of Error Rate, IEEE Transactions on Communication Technology, Vol. COM-16, No. 3, June 1968, pp. 380-387.
Murray: FM Parallel Tone Transmission System, IBM Technical Disclosure Bulletin, Vol. 14, No. 12, May 1972, pp. 3631-3632
Belman et al.: FSK Digital Demodulator with Majority Decision Filtering, IBM Technical Disclosure Bulletin, Vol. 13, No. 4, Sept. 1970, pp. 1042-1043.
Chadwick et al.: The Design of a Low Data Rate MSFK Communication System, IEEE Transactions on Communication Technology, Vol. COM-18, No. 6, Dec. 1970, pp. 740-750.

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