Alternative signal processor arithmetic for modified implementation of a normalised adaptive channel equaliser

A signal processor arithmetic based on a CORDIC and an array-multiplier/accumulator unit is proposed and an efficient implementation of an adaptive equaliser is given as an example. The concept combines the normalised lattice gradient and the well known LMS algorithm. The advantage of this approach is that the gradient lattice algorithm is less complex than the normalised least-squares lattice algorithm and only slightly slower, yet is still much faster than the gradient transversal LMS algorithm. It is shown that the modified CORDIC algorithm with the proposed arithmetic can reduce the computational complexity. To corroborate this point the computational efficiency and the amount of hardware needed for the proposed implementation are investigated