Single Carrier Radio Access with an Equivalent Transmission Speed of 256-QAM

In this paper, we propose an evolved partial response scheme capable of 256-QAM single carrier radio access. Rather than using such high order modulations as 64-QAM or 256-QAM, we employ aggregations of low order modulation signals whose transmission speeds are beyond the Nyquist rate. To detect these modulation signals, we use a semi-ring structure and reduced state methods in order to exploit the turbo principle, and this makes it possible to achieve high speed processing and low complexity. Simulation results show that, at the same coding and bit rates, the proposed method performs better than do high order modulations over AWGN and multi-path radio channels. Further, by employing opportunistic scheduling transmission, the proposed method is able to achieve improved FER performance. It does this by exploiting a property which turns a severe multipath fading condition into a performance benefit for a channel, making possible a better single carrier radio access scheme.