An adaptive least squares channel estimation based on conjugate gradient approach for multipath fading CDMA systems

Authors:
Ahmet Rizaner;Ali H. Ulusoy;Hasan Amca;Kadri Hacıoğlu
Affiliations:
Department of Information Technology, Eastern Mediterranean University, Famagusta - North Cyprus, via Mersin 10, Turkey;Department of Information Technology, Eastern Mediterranean University, Famagusta - North Cyprus, via Mersin 10, Turkey;Department of Electrical and Electronic Engineering, Eastern Mediterranean University, Famagusta - North Cyprus, via Mersin 10, Turkey;University of Colorado at Boulder, Center for Spoken Language Research, Boulder, CO 80309, USA
Venue:
Computers and Electrical Engineering
Year:
2011

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Abstract

Multiple access interference (MAI) is the main factor affecting the performance of channel estimation techniques for code division multiple access (CDMA) systems. Although, several multi-user channel estimation algorithms have been proposed to mitigate MAI, these algorithms require high computational complexities. In this paper, we address the problem of iterative least squares (LS) mobile channel estimation at high channel efficiency that requires a short training sequence along with the spreading sequences. We employ an efficient iterative method based on conjugate gradient (CG) algorithm to reduce the computational complexity of the estimation method. Computer simulations illustrate that the proposed method performs almost identical to the exact LS estimate for reasonable training lengths.