2013/02/17 by Yunlong Cai, Rodrigo C. de Lamare · 1 citation
Computer Science · Mathematics · #cs.IT #math.IT
published as IEEE Communications Letters, 2012 · 3 figures
arxiv created 2013/02/17 · arxiv updated 2013/02/19
In this letter, we propose a novel adaptive reduced-rank strategy based on joint iterative optimization (JIO) of filters according to the minimization of the bit error rate (BER) cost function. The proposed optimization technique adjusts the weights of a subspace projection matrix and a reduced-rank filter jointly. We develop stochastic gradient (SG) algorithms for their adaptive implementation and introduce a novel automatic rank selection method based on the BER criterion. Simulation results for direct-sequence code-division-multiple-access (DS-CDMA) systems show that the proposed adaptive algorithms significantly outperform the existing schemes.