Abstract
This paper presents a new method of decision-feedback equalization (DFE) with periodic interleaving for coded modulation systems. The method is an improved version of that proposed by Eyuboglu, where the deinterleaving operation is performed on a vector-by-vector basis, instead of a sample-by-sample basis. In the improved approach, the coefficients of both the feedforward and feedback filters can be updated based on delay-free decisions from the most likely path in the soft decoder. It achieves better error- rate performance than the original system with little increase in hardware complexity. Also, as compared to another improved design reported recently, the new structure gains advantages in error-rate performance, hardware complexity, and throughput delay. Moreover, the adaptive conventional-form DFE, which does not apply to the previous approaches, can be realized in the proposed one to achieve further equalization gain at little cost of loss of information rate.