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This paper presents a brief review of recent dc arc fault modeling and detection methods. The goal is to examine state-of-the-art technologies and to identify future research and development needs of dc arc fault protection in modern dc networks. For dc arc modeling, the focus is given to external characteristic equations which model the arc with electrical parameters. Moreover, models of the random...
In this paper, we present the performance analysis of 100 Gb/s polarization division multiplexed (PDM) differential quadrature phase shift keying (DQPSK) transmission system with spectral amplitude code (SAC) labels in computer simulation. In this system, the payload consists of two 25 Gbaud channels which are orthogonally polarized. Direct detection is selected to demodulate PDM payload in the receiver...
This paper proposes a high-sum-rate maximum signal-to-interference and noise ratio (Max-SINR) plus maximum signal-to-leakage and noise ratio (Max-SLNR) beamforming per user (Max-SINR plus Max-SLNR per user) at the relay station (RS) for multi-pair two-way relay system with multi-antenna users. The proposed beamformer applies Max-SINR and Max-SLNR to uplink and downlink channels, respectively. It beam-forms...
We present an integrated polarization-diversity coherent-receiver module which was fabricated on a polymer planar-lightwave circuit platform. The performance of the device is tested in system experiments with 16-QAM and QPSK modulation up to 112 Gb/s.
MIMO-OFDM technology make full use of space and spectrum resources, it can exponentially increase the channel capacity, so it is one of the core technology of next generation mobile communication systems. In order to estimate the time domain (or frequency domain) response of MIMO-OFDM systems fast and accurately, the traditional SVD estimator is modified in this paper. To reduce the time to compute...
A novel dual-quadrature coherent receiver based on a polymer planar lightwave circuit is presented. The packaged receiver is successfully operated in 112 Gb/s DP-QPSK transmission experiments showing only 1.3 dB penalty compared to theory.
The codebook based precoding is a promising technology adopted by Long Term Evolution (LTE), which fixes a common codebook comprising a set of vectors and matrices at both the transmitter and the receiver. For the codebook design, it is necessary to achieve high precoding gain, lower feedback overhead and flexibility to support various antenna configurations and different numbers of data streams....
Cooperative diversity is widely used in wireless communication. Because of its own unique advantages, we try to combine Cooperative diversity with OFDM. Key technologies of OFDM, three methods of channel estimation, two types of cooperation, and two combining methods in OFDM system are presented in this paper. Simulations of OFDM cooperative diversity system with two combining methods are performed...
Voice activity detection is considered as a crucial part of the speech signal processing. In order to improve the accuracy of voice activity detection under the high-noisy environment, an algorithm named distance entropy is proposed. The algorithm firstly enhances speech with short time spectral amplitude, and then utilizes the robustness of cepstral distance and spectral entropy. The experimental...
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