TY - GEN
T1 - Precoding for interference cancellation at Low SNR
AU - Philosof, Tal
AU - Erez, Uri
AU - Zamir, Ram
PY - 2002
Y1 - 2002
N2 - We investigate the application of the nested coding framework for cancelling known interference at low SNR, that is Px/Pz ≈ 1 and below. We consider multi-dimensional precoding, with anticipation of Ns > 1 "future" interference samples. Unlike non-precoded transmission, where capacity can be achieved at low SNR without shaping, optimum precoding at low SNR does require shaping. Eyuboglu and Forney's trellis precoding scheme combines Tomlinson Harashima precoding and trellis shaping, to achieve both coding and shaping gains in transmission over inter-symbol interference channel with Euclidean distance decoder. However, the standard configuration of this scheme does not support precoding at low SNR, where the capacity is Less than 1 bit/dim. Inspired by the nested lattices approach, we propose a variant of trellis precoding which combines MMSE estimation, dithering and construction of nested lattices which approach the interference channel capacity at low SNR.
AB - We investigate the application of the nested coding framework for cancelling known interference at low SNR, that is Px/Pz ≈ 1 and below. We consider multi-dimensional precoding, with anticipation of Ns > 1 "future" interference samples. Unlike non-precoded transmission, where capacity can be achieved at low SNR without shaping, optimum precoding at low SNR does require shaping. Eyuboglu and Forney's trellis precoding scheme combines Tomlinson Harashima precoding and trellis shaping, to achieve both coding and shaping gains in transmission over inter-symbol interference channel with Euclidean distance decoder. However, the standard configuration of this scheme does not support precoding at low SNR, where the capacity is Less than 1 bit/dim. Inspired by the nested lattices approach, we propose a variant of trellis precoding which combines MMSE estimation, dithering and construction of nested lattices which approach the interference channel capacity at low SNR.
UR - http://www.scopus.com/inward/record.url?scp=84955241396&partnerID=8YFLogxK
U2 - 10.1109/EEEI.2002.1178369
DO - 10.1109/EEEI.2002.1178369
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AN - SCOPUS:84955241396
T3 - IEEE Convention of Electrical and Electronics Engineers in Israel, Proceedings
SP - 144
EP - 147
BT - 22nd Convention of Electrical and Electronics Engineers in Israel, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 22nd Convention of Electrical and Electronics Engineers in Israel
Y2 - 1 December 2002
ER -