Fast joint space-time adaptive processing for DS/SS antenna array systems

Under a maximum cross-correlation criterion the familiar space-time RAKE processor is equipped with a single orthogonal space-time auxiliary vector for blind multiple access interference (MAI) and noise suppression with one complex space-time degree of freedom. This approach is readily extended to cover blind processing with multiple auxiliary vectors and any desired number of complex degrees of freedom below the space-time product. A sequential procedure for conditional auxiliary-vector weight optimization is shown to lead to superior BER performance when rapid system adaptation through limited training data is sought