Title :
Coding, equalization and feedback of digital cable pair signals
Author_Institution :
Bell-Northern Res., Ottawa, Ont., Canada
Abstract :
The performance with near-end crosstalk noise of zero-forcing optimum mean-squared-noise equalizer repeaters is studied. For 48-channel systems, duobinary is 5.6 dB superior to binary, and coding to reduce frequency energy causes a 4 to 6 dB performance degradation. Multi-tap decision feedback gives an additional 7.7 dB improvement over duobinary; a single tap gives only 1 to 2 dB improvement. Performance equivalent to present 24-channel repeaters but with 48-channel capacity using simple coding schemes appears feasible.
Keywords :
crosstalk; digital communication systems; encoding; equalisers; feedback; repeaters; telephone lines; duobinary; multi-tap decision feedback; near-end crosstalk noise; zero-forcing optimum mean-squared-noise equalizer repeaters; Couplings; Crosstalk; Encoding; Equalizers; Equations; Noise; Repeaters;
Journal_Title :
Electrical Engineering Journal, Canadian
DOI :
10.1109/CEEJ.1982.6594259
