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Accurate characterization of the radio channel in tunnels is of great importance for vehicle control communications systems. For the purpose of modeling characterizations of this special environment, actual measurements have been carried out at 1.89GHz in Shidao Mountain Highway Tunnel environment. During the measurements, a base station transmitters and a mobile receiver was installed in the tunnel...
Full-duplex relaying (FDR) is an efficient technique to serve remote users with low power consumption, however, careful interference suppression is needed to mitigate self interference (SI) and multi-user interference (MUI). When multiple FDRs are employed, inter-relay interference (IRI) emerges and degrades system performance severely by consuming excessive transmit power. In this paper, distributed...
In this paper, we propose a hybrid cellular network structure where co-frequency vertical coverage embedded on the cell edge, to improve the performance in the cell edge, using the cell interference depth as the interference threshold. Based on this proposed structure, three key performance metrics, i.e., the spectral efficiency, the cell throughput and the energy efficiency, are analyzed. The results...
A physical-layer security enhancement scheme in analog network coding systems based on artificial noise is proposed in this paper. In broadcast phase, the Relay node selects part of antennas from its total antennas as the received reference signal, and derives the beamforming matrix and artificial noise vector from the equivalent channel fading matrix. The simulation results show that the proposed...
This paper analyzes the influence of independent identical distributed phase noise (PN) at different transmit and receive antennas on the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) based communication systems. Assuming PN is not severe, we can show that the ICI of the phase noises can be separated into two additive terms, which are induced...
Block diagonalization (BD) is a low-complexity linear preceding scheme for multiuser MIMO (MU-MIMO) downlink, which can completely eliminate multi-user interference with perfect channel state information (CSI) at the transmitter. Under the assumption of block fading channels, BD with fixed amount of feedback is interference-limited. In this paper, we first introduce a low-complexity CSI feedback scheme,...
A novel fast recursive minimum mean square error successive interference cancellation (MMSE-SIC) algorithm with optimal detection order for vertical Bell Laboratories layered space-time (V-BLAST) systems is proposed. In this algorithm, the MMSE Alter matrices and the optimal detection order are successively computed from the previously obtained filter matrices according to simple recursive pseudoinverse...
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