IIR Lattice-Based Blind Equalization Algorithms

This paper develops infinite impulse response (IIR) lattice structures based on two widely known blind equalization algorithms, which are the multi-modulus algorithm (MMA) and the constant modulus algorithm (CMA). The motivation for doing so is that generally for algorithms to achieve the same performance, an IIR filter requires fewer coefficients than its corresponding finite impulse response (FIR) counterpart. Moreover, the monitoring of the stability of an IIR lattice filter is simpler and less computationally complicated than that of the direct-form IIR filter. Computer simulations that compare the IIR lattice-based blind equalization algorithm with the corresponding FIR transversal algorithms and FIR-based lattice algorithms demonstrate that the former is especially suitable for equalizing channels, yielding inter-symbol interference (ISI) that mostly results from the post-cursor term.