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In this paper, we propose a joint power allocation and antenna selection scheme for orthogonal-frequency-division-multiplexing (OFDM) distributed multiple-input multiple-output (D-MIMO) systems. Our aim is to increase energy efficiency (EE), under the constraint of transmission power of each remote access unit (RAU). Because of the multi-objective and non-convex nature of the problem, obtaining the...
This paper investigates the scheduling problem for a single-cell distributed multiple-input multiple-output (d-MIMO) downlink system with a massive number of remote access units (RAUs), N. We first derive the ergodic rate expressions for both the single RAU transmission (SRT) and the cooperative RAU transmission (CRT) modes as functions of long-term channel state information (CSI). Then, greedy scheduling...
This paper proposes a new codebook structure called Kronecker-product based codebook (KPC), where each codeword is the Kronecker product of two oversampled DFT codewords in both the horizontal and vertical domains. The KPC is especially suitable for the three-dimensional (3D) multiuser multi-input multi-output (MU-MIMO) systems. Besides, channel state information feedback based on the best companion...
A novel 3D cluster-based double-directional MIMO channel model with consideration of polarization is proposed and the modeling process is described in detail. The spatial channel model (SCM) proposed by 3GPP (3rd Generation Partnership Project) is retrieved and compared with the new model. Based on the new model, capacity and spatial correlation of the co-located dual- and triple-polarized MIMO systems...
In this paper, metamaterial spacer based on newly designed SRRs is studied aimed for better bandwidth while satisfying the S-parameters requirement for the MIMO system. The material property is analyzed. The simulations of the design are completed and the results show that the spacer based on such metamaterial can provide a satisfying reduction of the mutual coupling of the antennas over a quite wide...
Based on the theoretical analysis of microstrip antenna (MSA) loaded with a shorting-pin, a novel MSA with broad beamwidth is proposed. In the structure, multiple layers are used to achieve high radiation efficiency, while a conducting cylinder and a coupling aperture are applied to excite multiple modes to obtain broad beamwidth. Finally, a novel MSA is designed and fabricated as an example. The...
In this paper, we investigate the capacity and spatial correlation properties of MIMO system where polarized antenna elements are adopted at both the BS and the MS sides. We use the spatial channel model (SCM) proposed by 3GPP as the basic model for the analysis and the simulation. Capacity and spatial correlation of the polarized MIMO systems are compared with that of omnidirectional antenna MIMO...
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