Adaptive blind demodulation of DS/CDMA signals with transform domain Griffiths' algorithm
He-Chi Hwang, Che‐Ho Wei · 2003
The minimum mean-squared error (MMSE) linear detector has been used for demodulation of the direct-sequence code-division multiple access signals. The blind MMSE linear detector can be implemented by the Griffiths' adaptation algorithm. However, its convergence speed is limited by the wide eigenvalue spread of the correlation matrix associated with the received signal vectors. In this paper, the transform domain Griffiths' adaptation algorithm is proposed to improve the convergence properties. Computer simulations show that, by using orthonormal transforms, the adaptation speed can be improved, especially in the presence of strong interference.