QAM with DC bias in one channel

Details QAM with DC bias in one channel QAM with DC bias in one channel

1983-12-28

1986-04-08

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 42, 375 81, 329120, 329135, 332 17, H03C 500, H04D 500

Patent

active

045817480

ABSTRACT:
A radio communication system includes a transmitter unit, a transmission line, and a receiver unit. The transmitter unit modulates an in-phase-channel (I-ch) data signal and quadrature-channel (Q-ch) data signal with two carriers having a .pi./2 phase difference with each other. A DC offset is added to either one of the I-ch and Q-ch data signals before they are modulated. In the receiver unit, a demodulation operation is performed, for the received transmission signal, by a synchronous detection with the use of a leakage carrier created due to the DC offset and included in the transmission signal.

REFERENCES:
patent: 3311442 (1967-03-01), de Jager et al.
patent: 3343093 (1967-09-01), Van Gerwen
patent: 3378771 (1968-04-01), Van Gerwen et al.

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