Digital multi-level multi-phase modulation communication system

Details Digital multi-level multi-phase modulation communication system Digital multi-level multi-phase modulation communication system

1980-07-30

1982-08-31

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375 53, 375 42, 370 20, H04L 2718

Patent

active

043476163

ABSTRACT:
A 16 QAM communication system is provided wherein the proper arrangement and polarity of the four pulse trains on the receive side is determined by adding frame sync bits of a specific modulating character on the send side and reordering the receive side pulse trains in dependence upon the bits appearing in selected receive side pulse trains during the frame sync slots. The relation between the receive pulse trains and the transmit pulse trains is determined by the phase ambiguity between the transmit and receive carriers. By modulating the transmit carrier to have a specific amplitude during the frame sync slot, detecting this time at the receiver, and determining the bit values in certain of the pulse trains at the same time, the phase ambiguity can be determined and the pulse trains corrected.

REFERENCES:
patent: 3242262 (1966-03-01), Melas
patent: 3341776 (1967-09-01), Doelz

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