Asymmetric baseband equalization

For asymmetric channels, the performance of symmetric and asymmetric baseband equalizers is analyzed. For both structures, the frequency response and the output mean-square error (MSE) of the optimum equalizer of infinite length are given. Several specific modem imperfections are considered, and the associated CNR (carrier-to-noise ratio) degradation is computed for 256-QAM systems. The results show that while asymmetric equalizers lead to a very limited compensation of modem imperfections, asymmetric equalizers lead to a dramatic improvement and, in the range of practical interest, reduce the CNR degradation almost to zero