Modem for RF subscriber telephone system

Pulse or digital communications – Repeaters – Testing

Patent

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Details

332 9R, H04L 2720

Patent

active

047649402

ABSTRACT:
A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.

REFERENCES:
patent: 4049909 (1977-09-01), Peck
patent: 4268727 (1981-05-01), Agrawal et al.
patent: 4358853 (1982-11-01), Qureshi
patent: 4562415 (1985-12-01), McBiles
patent: 4575858 (1966-03-01), Dow
patent: 4583238 (1986-04-01), Boisseau et al.
patent: 4672633 (1987-06-01), Claasen et al.

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