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Sensors 2017, 17(5), 1105; doi:10.3390/s17051105

Low-Cost Nested-MIMO Array for Large-Scale Wireless Sensor Applications

1
Ministerial Key Laboratory of JGMT, School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China
2
School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
Academic Editors: Zhiguo Shi, Yujie Gu and Rongxing Lu
Received: 25 March 2017 / Revised: 7 May 2017 / Accepted: 9 May 2017 / Published: 12 May 2017
View Full-Text   |   Download PDF [473 KB, uploaded 12 May 2017]   |  

Abstract

In modern communication and radar applications, large-scale sensor arrays have increasingly been used to improve the performance of a system. However, the hardware cost and circuit power consumption scale linearly with the number of sensors, which makes the whole system expensive and power-hungry. This paper presents a low-cost nested multiple-input multiple-output (MIMO) array, which is capable of providing O ( 2 N 2 ) degrees of freedom (DOF) with O ( N ) physical sensors. The sensor locations of the proposed array have closed-form expressions. Thus, the aperture size and number of DOF can be predicted as a function of the total number of sensors. Additionally, with the help of time-sequence-phase-weighting (TSPW) technology, only one receiver channel is required for sampling the signals received by all of the sensors, which is conducive to reducing the hardware cost and power consumption. Numerical simulation results demonstrate the effectiveness and superiority of the proposed array. View Full-Text
Keywords: nested array; single receiver channel; time-sequence-phase-weighting (TSPW); multiple-input multiple-output (MIMO); degrees of freedom (DOF); large-scale array nested array; single receiver channel; time-sequence-phase-weighting (TSPW); multiple-input multiple-output (MIMO); degrees of freedom (DOF); large-scale array
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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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Zhang, D.; Wu, W.; Fang, D.; Wang, W.; Cui, C. Low-Cost Nested-MIMO Array for Large-Scale Wireless Sensor Applications. Sensors 2017, 17, 1105.

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