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Sensors 2018, 18(5), 1557; https://doi.org/10.3390/s18051557

Degree-of-Freedom Strengthened Cascade Array for DOD-DOA Estimation in MIMO Array Systems

1
School of Electronic and Control Engineering, Chang’an University, Xi’an 710064, China
2
School of Highway, Chang’an University, Xi’an 710064, China
3
School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
current address: School of Information Engineering, Xijing University, Xi’an 710123, China
*
Author to whom correspondence should be addressed.
Received: 21 April 2018 / Revised: 11 May 2018 / Accepted: 11 May 2018 / Published: 14 May 2018
(This article belongs to the Special Issue Sensor Signal and Information Processing)
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Abstract

In spatial spectrum estimation, difference co-array can provide extra degrees-of-freedom (DOFs) for promoting parameter identifiability and parameter estimation accuracy. For the sake of acquiring as more DOFs as possible with a given number of physical sensors, we herein design a novel sensor array geometry named cascade array. This structure is generated by systematically connecting a uniform linear array (ULA) and a non-uniform linear array, and can provide more DOFs than some exist array structures but less than the upper-bound indicated by minimum redundant array (MRA). We further apply this cascade array into multiple input multiple output (MIMO) array systems, and propose a novel joint direction of departure (DOD) and direction of arrival (DOA) estimation algorithm, which is based on a reduced-dimensional weighted subspace fitting technique. The algorithm is angle auto-paired and computationally efficient. Theoretical analysis and numerical simulations prove the advantages and effectiveness of the proposed array structure and the related algorithm. View Full-Text
Keywords: difference co-array; cascade array; angle estimation; weighted subspace fitting; multiple input multiple output systems difference co-array; cascade array; angle estimation; weighted subspace fitting; multiple input multiple output systems
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Yao, B.; Dong, Z.; Zhang, W.; Wang, W.; Wu, Q. Degree-of-Freedom Strengthened Cascade Array for DOD-DOA Estimation in MIMO Array Systems. Sensors 2018, 18, 1557.

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