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Information Journal Paper

Title

A NEW SWITCHED-BEAM SETUP FOR ADAPTIVE ANTENNA ARRAY BEAMFORMING

Pages

  1-10

Abstract

 In this paper, a new spatio-temporal based approach is proposed which improves the speed and performance of temporal-based algorithms, conventional Least Mean Square (LMS), Normalized LMS (NLMS) and Variable Step-size LMS (VSLMS), by using the SWITCHED BEAM technique. In the proposed algorithm, first, DOA of the signal source is estimated by Multiple Signal Classification (MUSIC) algorithm. In the second step, depending on the desired user's location, the closest beam of the SWITCHED BEAM system is selected and its predetermined weights are chosen as the initial values for the weight vector. Finally, LMS/NLMS/VSLMS algorithm is applied to initial weights and final weights are calculated. Simulation results show improved convergence and tracking speed and also a higher efficiency in data transmission through increasing the Signal to Interference plus Noise Ratio (SINR) as well as decreasing the Bit Error Rate (BER) and Mean Square Error (MSE), in a joint state. Moreover, Error Vector Magnitude (EVM) as a measure for distortion introduced by the proposed adaptive scheme on the received signal is evaluated for all LMS-based proposed algorithms which are approximately the same as that for conventional ones. In order to investigate the tracking capability of the proposed method, the system is assumed to be time varying and the desired signal location is considered once in the center of the initial beam and once in the edge of the fixed beam. As depicted in simulation results, the proposed DO Abased methods offer BEAM FORMING with higher performance in both cases of the initial beam, center as the best case and edge as the worst case, with respect to conventional ones. The MSE diagrams for this time varying system show an ideal response for DOA-based methods in the best case. Also, in the worst case, initial height of MSE is reduced and consequently the required iteration to converge is less than the conventional LMS/NLMS/VSLMS.

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    APA: Copy

    SHIRVANI MOGHADDAM, SHAHRIAR, & AKBARI, FARIDA. (2016). A NEW SWITCHED-BEAM SETUP FOR ADAPTIVE ANTENNA ARRAY BEAMFORMING. JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST), 4(1 (13)), 1-10. SID. https://sid.ir/paper/332689/en

    Vancouver: Copy

    SHIRVANI MOGHADDAM SHAHRIAR, AKBARI FARIDA. A NEW SWITCHED-BEAM SETUP FOR ADAPTIVE ANTENNA ARRAY BEAMFORMING. JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST)[Internet]. 2016;4(1 (13)):1-10. Available from: https://sid.ir/paper/332689/en

    IEEE: Copy

    SHAHRIAR SHIRVANI MOGHADDAM, and FARIDA AKBARI, “A NEW SWITCHED-BEAM SETUP FOR ADAPTIVE ANTENNA ARRAY BEAMFORMING,” JOURNAL OF INFORMATION SYSTEMS AND TELECOMMUNICATION (JIST), vol. 4, no. 1 (13), pp. 1–10, 2016, [Online]. Available: https://sid.ir/paper/332689/en

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