Abstract

The paper relates to the channel coding and transmission of the coded signals over bandlimited channels in the presence of additive white Gaussian noise (AWGN). The authors demonstrate a way for designing modulational codes with a sampling receiver with limited complexity. Combining multi-amplitude and multi dimensional systems into a digital communication system having both good power efficiency and good spectral efficiency is described. Advantages and simple hardware results of a modulation scheme, called 4A8DS (4-amplitudes, 8-dimensional signaling), in comparison with the 64-QAM scheme is demonstrated. A coding gain of 4.3 dB at E/sub b//N/sub 0/=10/sup -4/ with spectral efficiency of 5 bit/s/Hz is obtained.

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