Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1981-03-27
1983-05-17
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455139, 455276, H04B 106, H04B 110
Patent
active
043843662
ABSTRACT:
An interference compensation system having a main antenna (1) which receives both the desired signal and the undesired interference signal I.sub.M, an auxiliary antenna (2) which receives only the interference signal I.sub.A, an amplitude-phase control circuit which modifies the amplitude and the phase of the interference signal I.sub.A from the auxiliary antenna (2) according to the control signals A+a.multidot.cos .omega.t, and B+a.multidot.sin .omega.t, to provide the output signal I.sub.VM, and a combiner (4) which combines said signals I.sub.M and I.sub.VM to provide the output signal I.sub.E which is considered to be free from the interference signal except for the very little residual component of said interference signal, where A and B change according to the difference between I.sub.M and I.sub.A, (a) and (.omega.) are amplitude and angular frequency of the output of the low frequency oscillator (7).
REFERENCES:
patent: 4075566 (1978-02-01), D'Arcangelis
patent: 4160952 (1979-07-01), Seastrand, Jr.
patent: 4236158 (1980-11-01), Daniel
patent: 4320535 (1982-03-01), Brady et al.
"Applications of an Interference Cancellation Technique to Communications and Radar Systems", by Bristow, 9/79, No. 32.
Ng Jin F.
Nippon Telegraph & Tele. Public Corp.
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