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Appl. Sci. 2018, 8(9), 1509; https://doi.org/10.3390/app8091509

Optimal Location of the Access Points for MIMO-UWB Systems

1
Department of School of Electric and Information Engineering, Qinzhou University, Qinzhou 535000, China
2
Department of Electrical Engineering, Tamkang University, Tamsui 25137, Taiwan
*
Author to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 20 August 2018 / Accepted: 26 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Selected Papers from IEEE ICICE 2018..)
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Abstract

A multiple-input and multiple-output ultra-wideband (MIMO-UWB) system provides a higher data rate. However, the multipath effect of the intersymbol interference (ISI) increases the bit error rate (BER) and outage probability of the MIMO-UWB system. For this paper, the authors applied the real orthogonal design (ROD) to an MIMO-UWB system to improve the efficiency of that system. A ray-tracing technique and an inverse fast Fourier transform were used to get the impulse response of the indoor environment. In addition, a rake receiver was used to increase the strength of the received signal to minimize the multipath effect. For this paper, two cases of an indoor wireless MIMO-UWB system were studied: case (A) used different antenna arrays, whereas case (B) placed antenna arrays in different locations to find the best position of the transmitter. In case (A), three different shapes of antenna arrays, namely L-shape, circular-shape, and Y-shape, were used for the transmitter and receiver. The BER performance for these arrays in the UWB frequency of 3.1–10.6 GHz was examined. Numerical results showed that the outage probability of the circular array was better than that of the other two arrays. In case (B), the transmitter used was an array with two antenna elements. The optimal location for the transmitter was found by using both asynchronous particle swarm optimization (APSO) and self-adaptive dynamic differential evolution (SADDE). The numerical results indicated that the performance of APSO was better than that of SADDE. View Full-Text
Keywords: multiple-input and multiple-output (MIMO); ultra-wideband (UWB); real orthogonal design (ROD); self-adaptive dynamic differential evolution (SADDE); asynchronous particle swarm optimization (APSO) multiple-input and multiple-output (MIMO); ultra-wideband (UWB); real orthogonal design (ROD); self-adaptive dynamic differential evolution (SADDE); asynchronous particle swarm optimization (APSO)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chien, W.; Yu, C.-Y.; Chiu, C.-C.; Huang, P.-H. Optimal Location of the Access Points for MIMO-UWB Systems. Appl. Sci. 2018, 8, 1509.

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