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Performance of Dualbeam MIMO for Millimeter Wave Indoor Communication Systems

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Abstract

Millimeter wave (MMW) communication provides high data rates for the personal area networks with the availability of 57–64 GHz unlicensed spectrum, in indoor environment. Multipath fading being pre-dominant in indoor, multi input multi output (MIMO) technology is considered to be the ideal choice compared with the existing systems. As spatial diversity in both transmit and receive enhances the diversity gain, the performance of the system is further enhanced by introducing transmit beamforming based antenna beam diversity. In classical \(2\times 2\) MIMO, a diversity gain of 4 is achieved, whereas in this work, space time block code matrix of code rate 1/2 and dualbeam \(2\times 2\) MIMO with diversity gain 8 is considered. Dualbeam is generated by antenna array with four elements per array with out of phase feed configuration. The weight vector of the beamforming network is out of phase as to reduce the interference between the beams. The dualbeam transmitter is designed with unknown channel state information. Training symbols are transmitted to train and track the channel statistics at the receiver. The proposed work is carried out for MMW indoor system. The indoor channel is modeled using Triple Saleh–Valenzuela (TSV) model that takes into account both time of arrival and the angle of arrival information of the rays. Channel estimation is done for classical MIMO and the above proposed model in both Rayleigh and TSV channel. The orthogonal beams facilitate linear processing in the receiver. Hence maximum ratio combiner with maximum likelihood decoder is used in the receiver to decode the transmitted data. Classical MIMO and dualbeam MIMO are evaluated with respect to bit error rate and channel models. An improved diversity order is achieved with dualbeam MIMO compared to classical MIMO, with a power gain of 1.6 dB. The dualbeam MIMO using TSV is found to perform better compared to dualbeam MIMO using Rayleigh in the low Energy per bit to Noise level \((\hbox {E}_{\mathrm{b}}/\hbox {N}_{0})\) with a power gain of 2 dB.

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Authors and Affiliations

  1. Communication Engineering Research Group, Department of Electronics and Communication Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India

    S. Kirthiga & M. Jayakumar

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  1. S. Kirthiga
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  2. M. Jayakumar
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Correspondence to S. Kirthiga.

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Kirthiga, S., Jayakumar, M. Performance of Dualbeam MIMO for Millimeter Wave Indoor Communication Systems. Wireless Pers Commun 77, 289–307 (2014). https://doi.org/10.1007/s11277-013-1506-0

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