Equalisation for EDGE mobile communications

An equalisation concept for the novel radio access scheme enhanced data rat es for GSM evolution (EDGE) is proposed, by which high performance can be o btained at moderate computational complexity. Because high-level modulation is employed in EDGE, optimum equalisation as performed in most GSM receive rs is too complex, and suboptimum schemes have to be considered. It is show n that delayed decision-feedback sequence estimation (DDFSE) is a promising candidate. For various channel profiles, approximations for the bit error rate of DDFSE are given and compared with simulation results. It turns out that a discrete-time allpass prefilter creating a minimum-phase overall imp ulse response is indispensable for obtaining a favourable tradeoff between performance and complexity. Additionally, the influence of the receiver inp ut filter is investigated.