A Simple Adaptive Beamforming Algorithm for CDMA Wireless Communication Systems

Tavassoli, Farhad; Abolhassani, Bahman; Oraizi, Homayoon

doi:10.1109/pimrc.2006.254361

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…In CFA, traditional RAKE receiver for CDMA is replaced by a beamformer-RAKE receiver in which beamforming is applied to each finger, and then the outputs of from each finger is summed up. Since then, many research efforts have been put in the development of beamforming algorithms for CDMA systems with the emergence of 3G wireless systems [10][11][12][13][14][15][16][17].…”

Section: Related Workmentioning

confidence: 99%

A Practical Space-Code Correlator Receiver for DSP Based Software Radio Implementation in CDMA2000

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Kavak

Karakoc

et al. 2008

Wireless Pers Commun

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Development of practical algorithms for beamforming in 3G CDMA systems and their software radio implementations are still a challenging task, which will facilitate upgrading of traditional base stations into smart antenna capable 3G base stations. In this paper, we propose a practical space-code correlator (SCC) receiver structure for its software radio implementation a DSP. SCC's advantage comes from the fact that it doesn't require any training sequence or learning parameter as in other algorithms (LMS or CM). DSP implementations of the SCC are performed using Texas Instruments C67xx family platforms. In the simulations, reverse link base band signal format of CDMA2000 is used and the effects of different array topologies (uniform linear array-ULA or uniform circular array-UCA) are considered. The implementation results regarding beamforming accuracy, weight vector computation time (execution time), search resolution effect on DOA estimation accuracy, DSP resource utilization, and received SINR are presented. The results show that DSP based SCC beamformer can estimate weight vectors within less than 10 ms with DOA search resolution of 2 • especially when C6713 DSP is used. With faster DSPs and 123 246 K. Kucuk et al. larger search resolutions, execution time could be significantly reduced as well. It provides comparable SINR performance with LMS and CM algorithms.

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Section: Related Workmentioning

confidence: 99%

A Practical Space-Code Correlator Receiver for DSP Based Software Radio Implementation in CDMA2000

Küçük

Kavak

Karakoc

et al. 2008

Wireless Pers Commun

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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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“…In [13], for the above problem, the Lagrange multiplier method, instead of CGM, is used to find the largest eigenvector. In [14], a time-efficient but effective method for beamforming in CDMA is proposed, which is based on the mathematical work of Oja [15].…”

Section: Introductionmentioning

confidence: 99%

A new eigen decomposition based algorithm for beamforming in CDMA communication systems

Tavassoli

Abolhassani

Oraizi

2006

2006 IEEE GCC Conference (GCC)

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A new adaptive beamforming method for direct sequence code division multiple access (DS-CDMA) communication systems is proposed, which has low computational load. The proposed method needs only 2N+1 complex multiplications and 2N-1 complex additions, where N is the number of antennas in the array. We evaluate the performance of the proposed method in estimating the angle-of-arrival (AOA) of the desired signal and in producing the array beam pattern. Moreover, the performance of the proposed method in alleviating the probability of bit error in both fading and non-fading channel is verified. It is observed that although the proposed method has low computational load, nevertheless it has desirable performance.

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A Simple Adaptive Beamforming Algorithm for CDMA Wireless Communication Systems

Cited by 4 publications

References 14 publications

A Practical Space-Code Correlator Receiver for DSP Based Software Radio Implementation in CDMA2000

A Practical Space-Code Correlator Receiver for DSP Based Software Radio Implementation in CDMA2000

Three novel simple beamforming algorithms for CDMA communication systems

A new eigen decomposition based algorithm for beamforming in CDMA communication systems

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