Abstract
In the context of this research work, we study the so-called problem of full snapshot reconstruction in hybrid antenna array structures that are utilized in mmWave communication systems. It enables the recovery of the snapshots that would have been obtained if a conventional (non-hybrid) uniform linear antenna array was employed. The problem is considered at the receiver side where the hybrid architecture exploits in a novel way the antenna elements of a uniform linear array. To this end, the recommended scheme is properly designed so as to be applicable to overlapping and non-overlapping architectures. Moreover, the full snapshot recoverability is addressed for two cases, namely for time-varying and constant signal sources. Simulation results are also presented to illustrate the consistency between the theoretically predicted behaviors and the simulated results, and the performance of the proposed scheme in terms angle-of-arrival estimation, when compared to the conventional MUSIC algorithm and a recently proposed hybrid version of MUSIC (H-MUSIC).
Highlights
Communications in the millimeter wave spectrum are bringing a new era for the generations of wireless and cellular telecommunication systems [1,2,3]
The recoverability of the full snapshot is considered for the problem of angles of arrival (AoA) estimation in 1D mmWave massive multiple-input and multiple-output (MIMO) systems by employing MUSIC
The carrier frequency fc is selected in the mmWave band and it is set to 30 GHz, which corresponds to a wavelength equals to 1 cm and antenna spacing 0.5 cm
Summary
Communications in the millimeter wave (mmWave) spectrum are bringing a new era for the generations of wireless and cellular telecommunication systems [1,2,3]. Assuming a network of phase-shifters, the main characteristics and differences between these architectures are the following [10]: (1) A fully connected network provides full precoding (combining) gain, achieves highly directive transmissions by adjusting the phases of the transmitted signals in all antenna elements with constant modulus phase-shifters, but it has high complexity. Severe propagation losses occurring at the mmWave band could be balanced by hybrid precoding (combining) techniques using massive MIMO technology, in order to provide high antenna array gain, through narrow directional beamforming, and sufficient spatial coverage [10]. The main drawback of these algorithms is that they are not compatible with the hybrid architectures that are proposed for mmWave transmitters (receivers) These algorithms fail to resolve coherent/highly correlated signals which are very common in communication systems due to the multi-path phenomenon, their performance is degraded. Uppercase bold letters are matrices, lowercase bold letters are vectors, letters with a hat are estimations, (·)T denotes the transposition, (·)H denotes the complex conjugate transposition, E[·] means statistical expectation, Tr{.} denotes the trace of a matrix and I is the identity matrix
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