Title :
A new adaptive beamforming algorithm for WCDMA systems (Uplink)
Author :
Adian, Mehdi Ghamari ; Behnia, Fereydoon
Author_Institution :
Sharif Univ. of Technol., Tehran
Abstract :
In the realization of adaptive beamforming algorithms, the least-mean-squares (LMS) algorithm had been the most popular scheme used for smart antenna systems. This paper proposes an alternate scheme in the form of the normalized LMS (NLMS) algorithm with active tap detection for WCDMA systems. By taking advantage of spatial filtering, the proposed scheme promises to reduce the bandwidth required for transmitting data by improving convergence rate. The performance of the frequency domain NLMS algorithm in the presence of multipath effects and multiple users is analyzed using simulations. This analysis is compared to that of LMS algorithm and suggests improvement in the convergence rate and number of active taps used, which leads to better system efficiency.
Keywords :
adaptive antenna arrays; array signal processing; code division multiple access; convergence; least mean squares methods; spatial filters; WCDMA systems; active tap detection; adaptive beamforming algorithm; convergence rate; frequency domain; normalized least-mean-squares algorithm; smart antenna systems; spatial filtering; Adaptive arrays; Algorithm design and analysis; Array signal processing; Bandwidth; Convergence; Filtering; Frequency domain analysis; Least squares approximation; Multiaccess communication; Performance analysis; Adaptive beamforming; LMS algorithm; Uplink communication; WCDMA systems;
Conference_Titel :
Telecommunications and Malaysia International Conference on Communications, 2007. ICT-MICC 2007. IEEE International Conference on
Conference_Location :
Penang
Print_ISBN :
978-1-4244-1094-1
Electronic_ISBN :
978-1-4244-1094-1
DOI :
10.1109/ICTMICC.2007.4448623
