PSK Modulator with reduced adjacent channel interference

Details PSK Modulator with reduced adjacent channel interference PSK Modulator with reduced adjacent channel interference

1979-04-02

1981-04-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 67, H03K 2549, H04L 2720

Patent

active

042610532

ABSTRACT:
A PSK modulator employs a waveform of the overlapped raised cosine type which results in reduced adjacent channel interference. Waveforms of the overlapped raised cosine type include the overlapped raised cosine waveform itself as well as waveforms substantially similar thereto. Such waveforms can be produced, in a PSK modulator, by employing a Thomson filter with a single attenuation pole. Employing such a filter with a time bandwidth product (BT) of 1.2 provides the overlapped raised cosine waveform. However, changing the Thomson filter's BT product to 1.0 to thereby generate a waveform of the overlapped raised cosine type provides even further improvements in adjacent channel interference.

REFERENCES:
patent: 2084740 (1937-06-01), McKesson
patent: 2719189 (1955-09-01), Bennett et al.
patent: 3177431 (1965-04-01), Ashley
patent: 3597688 (1971-08-01), Ogi
patent: 3890581 (1975-06-01), Stuart et al.

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