Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-10-08
2000-05-09
Vo, Don
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375262, 714792, 714795, H04L 2302, H04L 512
Patent
active
060614072
ABSTRACT:
Trellis-enhanced precoding for trellis-coded transmission over channels with intersymbol interference allows coding and shaping gains to be achieved with minimal transmit power penalty for arbitrary signal constellations, provided the intersymbol interference channels are linearly invertible. This technique can be employed for trellis-coded transmission over a variety of communication channels. However, if the channel response exhibits spectral nulls, trellis-enhanced precoding cannot be applied because the corresponding inverse precoding operation at the receiver requires inverse channel filtering. For channels with a spectral null, this inverse operation can result in unlimited error propagation. The present invention allows trellis-coded transmission over channels exhibiting spectral nulls without incurring unlimited error propagation in the receiver. Coding gains are achieved with minimal transmit power penalty, like in the case of trellis-enhanced preceding. The invention is applicable for most signal sets used in practice.
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patent: 5263051 (1993-11-01), Eyuboglu
patent: 5388124 (1995-02-01), Laroia et al.
patent: 5418531 (1995-05-01), Laroia
patent: 5446758 (1995-08-01), Eyuboglu
patent: 5455839 (1995-10-01), Eyuboglu
patent: 5488633 (1996-01-01), Laroia
Cherubini Giovanni
Oelcer Sedat
Ungerboeck Gottfried
Cameron Douglas W.
Dougherty Anne Vachon
International Business Machines Corp.
Phu Phuong
Vo Don
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