In this paper, a method of Tomlinson-Harashima precoding (THP) combined with receive beamforming for the multi-user MIMO broadcast channel is proposed. When the base station and user terminals all have multiple antenn...
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In this paper, a method of Tomlinson-Harashima precoding (THP) combined with receive beamforming for the multi-user MIMO broadcast channel is proposed. When the base station and user terminals all have multiple antennas, each user's receiver maximizes the system sum rate with receive beamforming, and the base station use THP based on zero forcing criteria to cancel multiuser interferences (MUI). Simulation results show that the proposed method, THP-BF, has better BER performance than traditional THP and some linear precoding methods such as block diagonalization (BD) and zero forcing (ZF). The sum rate of ZF-THP at asymptotically high SNR is computed, and the computation results are consistent with simulation results. Simulation results reveal that ZF-THP has higher sum rate than linear precoding methods (such as ZF and BD) due to its more degrees of freedom of MIMO channels, and that THP-BF also has higher sum rate than traditional THP at low and moderate SNR.
This paper constructed signal models of four types of signal in wireless communication, i.e. single user MIMO signal, single user single antenna signal, virtual MIMO signal and multibeam smart antenna signal first, an...
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This paper discusses system models of three types of signal in wireless communication, i.e. single user single antenna signal, virtual MIMO signal and single user MIMO signal. Based on the model, proposes a method for...
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In this paper, we construct signal modelings of four types of signals in wireless communication, i.e. single user single antenna signal, virtual MIMO signal, multibeam smart antenna signal and single user MIMO signal ...
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In this paper, dopant segregation (DS) method is adopted to enhance device performance of PtSi-based Schottky-barrier source/drain MOSFETs (SB-MOSFETs) fabricated on ultrathin silicon-on-insulator. The DS formation is...
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This works demonstrates a novel approach using Si implantation prior to Pt deposition and PtSi formation to control the underlap length between the PtSi source/drain regions to the gate in Schottky-Barrier (SB-) MOSFE...
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NC-OFDM is OFDM-based spectrum pooling technique and also a transmission mode of cognitive radio. The paper models and analyzes NC-OFDM stochastic process, then designs stochastic comb-pilot pattern and analyzes its c...
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Most blind source separation algorithms are only applicable to real signals,while in communication reconnaissance processed signals are *** solve this problem,a blind source separation algorithm for communication comp...
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Most blind source separation algorithms are only applicable to real signals,while in communication reconnaissance processed signals are *** solve this problem,a blind source separation algorithm for communication complex signals is deduced,which is obtained by adopting the Kullback-Leibler divergence to measure the signals’*** the other hand,the performance of natural gradient is better than that of stochastic gradient,thus the natural gradient of the cost function is used to optimize the *** to the conclusion that the signal’s mixing matrix after whitening is orthogonal,we deduce the iterative algorithm by constraining the separating matrix to an orthogonal *** results show that this algorithm can efficiently separate the source signals even in noise circumstances.
As multicast applications become more and more popular, implementing multicast in optical domain has attracted more and more attention due to its more efficient bandwidth usage. The MC-OXC is the key for realizing mul...
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The sensing performance of local detection in cognitive radio systems will be degraded when the channel experience fading and shadowing, and hidden terminal problem is inevitable for the primary transmitter-sensing. T...
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The sensing performance of local detection in cognitive radio systems will be degraded when the channel experience fading and shadowing, and hidden terminal problem is inevitable for the primary transmitter-sensing. To overcome this problem, cooperative spectrum sensing has been proposed. We propose a twice-cooperative sensing algorithm to improve the sensing performance. By comparing to the single-cooperative, the simulations show that the proposed algorithm can enhance the sensing performance and the proposed algorithm can also save the band width of the control channel.
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