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Multi-user transmission, enabled through spatial multiplexing, is a promising technique in wireless systems by sending information to more than one user on a common resource block. Although efficient, precise channel information is needed in order to minimize the possible interferences. Motivated by its importance, the study investigates interference management in multi-user downlink systems under...
In this paper, we analyse the Hankel matrix format MIMO channel model of thinned linear array. Then we give a uniform virtual phase centre restricted symmetrical distributed thinned array designing method. Based on the designed thinned array and 3D SAR imaging geometry, the equivalent phase error and motion compensation is discussed. At last we give a downward looking 3D SAR imaging algorithm based...
This paper studies the effects of antenna layout on Multiple Input Multiple Output (MIMO) system capacity. First, a spatial antenna channel model based on Jakes fading model with the power azimuth spectrum (PAS) is introduced and the expression of spatial correlation is given. Then the numerical results for the ergodic MIMO capacity under several typical antenna layout is simulated which indicates...
The dual-transmit and multiple-receive (DTMR) configuration of linear array antennas (LAA) is firstly introduced in downward-looking 3D-SAR imaging in this paper. The geometrical model and the signal model based on the principle of time diversity and waveform diversity are analyzed. The three-dimensional imaging processing algorithm for downward-looking 3D-SAR with DTMR-LAA is given via a stepwise...
The wireless networks lack a physical boundary due to the broadcasting nature of wireless transmissions. The security has become a critical concern in the physical layer of the wireless networks. In this paper, we propose a novel MIMO-aided security scheme. By exploiting an extra dimension provided by MIMO systems for adding artificial noise to the transmission process, which let the attacker's signal...
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