Blind cascaded fractionally-spaced and baud-spaced equaliser

The authors address the problem of fractionally-spaced blind equalisation when there exist common zero(s) among subchannels. They propose a new cascaded fractionally-spaced and baud-spaced structure to tackle this difficulty. The recent constant modulus algorithm under soft constraint satisfaction (SCS-CMA) is used to demonstrate the feasibility of the technique. Simulations show that the performance of the proposed scheme is superior to those of both fractionally-spaced and baud-spaced CMAs, when channels have common zero(s)