Minimization of multipath and doppler effects in radiant energy

Details Minimization of multipath and doppler effects in radiant energy Minimization of multipath and doppler effects in radiant energy

1981-02-02

1982-09-14

Ng, Jin F.

Pulse or digital communications

Repeaters

Testing

375100, 455 65, 367904, H04L 104

Patent

active

043499155

ABSTRACT:
Apparatus is disclosed for reproducing transmitted information which is subject to multipath delay spread effects and doppler frequency-shift effects. The information is transmitted as a series of modulated information pulses of differing nominal frequencies. The nominal frequencies of successive pulses are repeatedly shifted through a predetermined sequence of frequencies. Arrivals of the transmitted pulses are detected at a receiver and are processed to determine the frequencies to which the transmitted pulses are doppler shifted and the multipath delays of each pulse. This frequency and delay information is then used to reproduce the transmitted information from the arrival pulses.

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patent: 3523250 (1970-08-01), Branham
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patent: 3617889 (1971-11-01), Rabinowitz
patent: 3638174 (1972-01-01), Haase et al.
patent: 3723956 (1973-03-01), Carman
patent: 3742440 (1973-06-01), Ehrlich et al.

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