Improved iterative least squares RAKE-combiner using beamspace transformations

Antenna arrays can be used in mobile communication systems to increase capacity and performance. However, as the number of antenna elements grows, the computational burden increases significantly. To reduce the total computational cost, a beamspace transformation is derived, based on the statistical model of the array signal. Although the transformation derived here is applicable to many algorithms, it is matched to the decoupled weighted iterative least squares with projections RAKE-combiner algorithm. Not only is the computational cost reduced, the overall performance is improved by using an appropriate beamspace transformation.