Interference rejection using a hybrid of a constant modulus algorithm and the spectral correlation discriminator

The authors present a novel time-dependent adaptive filtering technique that is formed by combining a constant modulus algorithm (CMA) with the spectral correlation discriminator (SCD). This technique is superior to the CMA or SCD alone, as it produces a lower MSE (mean square error) and bit-error rate. The hybrid CMA/SCD has improved resistance to interference and less phase roll than the CMA. Furthermore, the hybrid CMA/SCD does not distort the filtered signal, as does the SCD alone. Simulations are presented comparing the SCD, CMA, and training-sequence-directed techniques with the hybrid CMA/SCD for interference rejection