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Massive multiple-input multiple-output (MIMO) systems are promising technology to greatly increase the spectral efficiency for the 5G cellular system. However, the implementation is practically a challenge due to the limitation of cost, space, and complexity. Though the millimeter-wave (mm-wave) transmission can greatly save the space for deploying numerous antennas, the demand on the numerous RF...
In massive multiple-input multiple-output (MIMO) system with time-shifted pilots, the interference from other cell groups, where the pilots are staggered with the ones in the target cell group, can be eliminated when the number of antennas at base station (BS) is infinite. However, with only hundreds of antennas at the BS in practice, both intra-group interference and inter-group interference can...
This paper designs a multi-input multi-output (MIMO) synthetic aperture radar (SAR) system using digital implemented orthogonal frequency division multiplexing (OFDM) waveforms, which can not only avoid ambiguous energy caused by the nonideal orthogonality of current-taken MIMO SAR waveforms, but also reduce the pulse repetition frequency (PRF) by a factor of 2Nl −1, where l N denotes the number of...
Special attention has been devoted to the lightweight, cost effective frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) in recent years. However, FMCW SAR is not feasible in the case of wider swath or higher Doppler bandwidth, because the loss of range resolution is dramatic and the system sampling rate is high. By using the technique of multi-input multi-output (MIMO), the...
In the downlink of multiuser MIMO (MU-MIMO) systems, the co-channel interference (CCI) and noise are two major impairments. Maximizing signal to leakage plus noise ratio (SLNR) is a good criterion for the design of precoders since it making a balance between eliminating the CCI and noise. In this text, we propose a channel adaptive power allocation scheme based on SLNR precoding. Simulation results...
This paper presents an iterative Maximum Likelihood Decoding (MLD) scheme for Multiple Input Multiple Output (MIMO) systems using Space-Time Block Codes (STBC) in strong directional interference scenario. The proposed scheme avoids matrix-inversion computation needed in ordinary reception schemes and estimates noise-subspace-projected channel matrix instead of real channel matrix to perform decoding...
Current Alamouti's reception scheme for multiple input multiple output (MIMO) communication systems may fail to work when strong interferences exist in the MIMO channel. This paper analyzes and compares three reception schemes for MIMO systems using orthogonal space-time block codes (OSTBCs) suffered directional interferences. These schemes include conventional maximum likelihood decoding (MLD) scheme,...
This paper presents an interference suppression reception scheme for the multiple input multiple output (MIMO) communication systems using orthogonal space-time block codes (OSTBCs) in strong interference scenario. Based on the noise subspace projection, the maximum likelihood decoding (MLD) for OSTBCs can be achieved by simple linear processing in this scheme. Moreover, the approach to obtain the...
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