Efficiency data transmission technique

Details Efficiency data transmission technique Efficiency data transmission technique

1986-12-02

1988-01-19

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 58, 375 60, H04L 2534, H04B 1500

Patent

active

047208392

ABSTRACT:
Partial response and quadrature partial response data transmission system characterized by increased transmission rate, lower signal-to-noise ratio, low cost and simpler hardware implementation than prior art systems. A steep filter (almost rectangular) is connected to the output of a cosine filter, forming a composite filter, wherein the cut-off frequency of the rectangular filter is less than the Nyquist frequency by a predetermined amount which is inversely proportional to the amount in percentage by which the data transmission rate exceeds the Nyquist rate. The system is thus capable of signalling at the Nyquist rate and greater, without requiring that channel filter parameters or the basic clock rate be adjusted. A smaller number of signal levels can be selected (as compared to previously existing methods) for spectrally efficient applications, and the resulting more robust system can also be used to transmit PAM, QAM, and other baseband or modulated signals.

REFERENCES:
patent: 3380330 (1968-06-01), Kretzmer
patent: 3457510 (1969-07-01), Lender
patent: 3515991 (1970-06-01), Lender
patent: 3573622 (1971-04-01), Holzman et al.
patent: 3947767 (1976-03-01), Koike et al.
patent: 4123710 (1978-10-01), Stuart et al.
patent: 4439863 (1984-03-01), Bellamy

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