Modem in-band secondary channel via radial modulation

Details Modem in-band secondary channel via radial modulation Modem in-band secondary channel via radial modulation

1982-12-27

1985-06-25

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

370 20, H04L 2708

Patent

active

045258465

ABSTRACT:
A transmission system for transmitting a first data series, and a second data series from a first modem to a second modem using QAM or PSK type modulation techniques. The first data series is sent using standard QAM techniques such as an 8-point scheme, wherein each point has a radial component. The second data series is sent by modulating slightly the radial components of the transmitted symbols between two values in accordance with the second data series.

REFERENCES:
patent: 3710257 (1973-01-01), Low et al.
patent: 3732375 (1973-05-01), Kuribayashi
patent: 3809817 (1974-05-01), Gill et al.
patent: 3855533 (1974-12-01), Schueli
patent: 4255713 (1981-03-01), Yoshida
patent: 4347616 (1982-08-01), Murakami
patent: 4389722 (1983-06-01), Hofmeister

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