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QUASI-OPTIMAL T-VVA IN CODED MIMO SYSTEMS
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作者 WangBing ZhaoYuping ZouLi LiangQinglin 《Journal of Electronics(China)》 2005年第2期125-130,共6页
Vector Viterbi Algorithm (VVA) is an optimal decoding algorithm in multiplechannel environments. It can be applied in coded Multi-Input-Multi-Output (MIMO) systems,but its complexity makes its application difficult. T... Vector Viterbi Algorithm (VVA) is an optimal decoding algorithm in multiplechannel environments. It can be applied in coded Multi-Input-Multi-Output (MIMO) systems,but its complexity makes its application difficult. This paper proposes adaptive Threshold VVA (T-VVA) for coded MIMO system. By adaptively choosing a threshold according to Signal to Noise Ratio (SNR) of channel, T-VVA only searches a subset of branchesfor path extension. The easy method to decide the threshold is also derived based on Cheroff bound. Simulation results show that the near-optimal decoding results can be obtained with largely reduced complexity. 展开更多
关键词 Multi-Input-Multi-Output (MIMO) Vector Viterbi Algorithm (VVA) Threshold VVA(T-VVA)
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Channel distributions of the transient power overshoot in backward-pumped Raman amplified WDM systems 被引量:1
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作者 郑磊 陈章渊 +1 位作者 吴德明 牛忠霞 《Chinese Optics Letters》 SCIE EI CAS CSCD 2004年第9期503-504,共2页
The time and amplitude characteristics of the transient power overshoot caused by channels adding up are studied both experimentally and numerically in the backward-pumped Raman amplified wavelength division multiplex... The time and amplitude characteristics of the transient power overshoot caused by channels adding up are studied both experimentally and numerically in the backward-pumped Raman amplified wavelength division multiplexing (WDM) system. The results show that the shorter the signal wavelength is, the smaller the last time of the transient power overshoot will be. The maximal power overshoot is small and does not deadly damage the optical component, and the channel distribution of the maximal value of the power overshoot has similar curve in shape with that of the system ON-OFF gain. 展开更多
关键词 Optically pumped lasers Raman scattering Wavelength division multiplexing
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