Reverse Link Performance of DS-CDMA Cellular Systems through Closed-Loop Power Control, Base Station Assignment, and Antenna Arrays in 2D Urban Environment

Dosaranian‐Moghadam, Mohamad; Bakhshi, Hamidreza; Dadashzadeh, Gholamreza

doi:10.1007/s11277-011-0250-6

Cited by 2 publications

(1 citation statement)

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“…The effects of noise, interference, and fading in communication systems can be significantly reduced by using beamforming . It has been demonstrated in that the use of antenna arrays and beamforming can improve the QoS in time division multiplexing, OFDM, and code division multiple access (CDMA) communication systems.…”

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%