A New Rayleigh Quotient Based Beamforming Method for CDMA Communication Systems

Tavassoli, Farhad; Oraizi, Homayoon; Abolhassani, Bahman

doi:10.1109/vetecs.2007.132

Cited by 2 publications

(1 citation statement)

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“…Part of this work has been presented in . Specific beamforming methods based on Oja objective function and two Rayleigh quotient based objective functions (SGM and Luo) were proposed in , respectively. The procedures varied with the utilized objective function.…”

Section: Introductionmentioning

confidence: 99%

Three novel simple beamforming algorithms for CDMA communication systems

Tavassoli

Abolhassani

Oraizi

et al. 2012

Int J Communication

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SUMMARYTo apply a beamforming algorithm with a linear array of N antennas in real wireless communication systems, two main issues should be addressed: Algorithm complexity and number of antennas. In this paper, we propose three simple beamforming algorithms for direct sequence code division multiple access systems. We first propose a new framework to obtain the updating equation for the weight vector using PCA. Then, using this framework, four different objective functions are used as examples to illustrate how to obtain new adaptive algorithms. We demonstrate that these objective functions lead to three novel blind algorithms, with two of them resulting in the same algorithm. Moreover, they have considerably low complexities, requiring only 2N–1 complex additions and either 2N+1 or 2N complex multiplications for a single run. We evaluate the performances of these algorithms in estimating the angle‐of‐arrival of the desired signal and in producing the array beam pattern, and in alleviating the BER in Rayleigh fading and AWGN channels. In summary, these new beamforming algorithms obtained based on the proposed framework operate as blind algorithms, have low computational complexities, and offer desirable performances even if N is restricted.Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%