Data signal transmission system using decision feedback equaliza

Details Data signal transmission system using decision feedback equaliza Data signal transmission system using decision feedback equaliza

1988-06-08

1989-09-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 99, H04B 314

Patent

active

048706574

ABSTRACT:
A system for transmitting a data signal (a.sub.k) at a given symbol rate 1/T comprises a data transmitter (1), a channel (3(1)) of a transmission facility (3) having a plurality of channels (3(1)-3(M), and a data receiver (2) with an equalizer (7) of the decision feedback type. This equalizer comprises a feedback filter (12) with a memory span NT and a feedforward filter (8) which includes a low-pass filter section having a substantially minimum-phase character and an amplitude-frequency characteristic .vertline.W(f).vertline. which has a pronounced maximum .vertline.W(f.sub.m).vertline. for a frequency f.sub.m near to the frequency f=1/((N+1)T) and which is decreasing for frequencies exceeding f.sub.m [FIG. 5A]. Consequently, with respect to conventional dimensionings of the equalizer (7), this achieves an improved transmission quality and/or a reduced complexity of the feedback filter (12).

REFERENCES:
patent: 4389727 (1983-06-01), Rouffet
patent: 4404600 (1983-09-01), Murakami
patent: 4577329 (1986-03-01), Brie et al.
patent: 4701936 (1987-10-01), Clark et al.

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