A LOW-COMPLEXITY EQUALIZATION CONCEPT FOR FREQUENCY-SELECTIVE MOBILE RADIO CHANNELS

A low complexity equalization concept applicable to frequency-selectiv e mobile radio channels is proposed. The equalization concept is a con catenated scheme combining low complexity equalizers with an efficient coding scheme in order to achieve good performance at low overall com plexity, The coding scheme consists of a simple single-parity check co de and allows for maximum-likelihood decoding at the receiver. Thus, h igh coding gains with only little additional complexity are achieved. Different suboptimum, low complexity equalization schemes are investig ated and their performance losses with respect to the optimum equalize r are determined using Monte-Carlo simulations. Appropriate low comple xity equalizer structures are identified and further investigated as p art of the proposed equalization concept. Simulation results show that the performance losses introduced through low complexity equalization can easily be overcompensated applying the proposed equalization conc ept. Typically, the performance losses in signal-to-noise ratio at a b it error rate of 10(-4) are less than 1 dB, whereas the coding gains a re more than 2 dB. Thus, the proposed equalization concept achieves be tter performance than the optimum equalizer at a lower overall complex ity.