| 线性预编码OFDM系统的迭代接收机 |
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| 引用本文： | 温海波,虞红芳,李乐民,王晟.线性预编码OFDM系统的迭代接收机[J].电子学报,2004,32(12):1992-1996. |
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| 作者姓名： | 温海波 虞红芳 李乐民 王晟 |
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| 作者单位： | 华中科技大学电子与信息工程系,湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金，教育部科学技术研究项目，电子科技大学校科研和教改项目 |
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| 摘 要： | 线性预编码是OFDM系统在频率选择性衰落信道中利用频率分集的有效方法.为了进一步提高性能,本文提出了一种线性预编码OFDM系统的迭代接收机,该迭代接收机采用基于线性最小均方误差准则(LMMSE)的turbo均衡算法及其简化方法,具有很低的计算复杂度.本文同时还提出通过使用长度不小于等效离散时间信道的时延扩展长度的线性预编码器和迭代接收机,可获得完全的频率分集增益.仿真表明本文提出的方法在多径干扰严重的信道条件下的误码率性能接近AWGN下界.
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| 关 键 词： | OFDM 线性预编码 Turbo均衡 线性最小均方误差准则 |
| 文章编号： | 0372-2112(2004)12-1992-05 |
| 收稿时间： | 2002-11-26 |
Dynamic Shared-Path Protection Algorithm for WDM Grooming networks |
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| WEN Hai-bo,YU Hong-fang,LI Le-min,WANG Sheng.Dynamic Shared-Path Protection Algorithm for WDM Grooming networks[J].Acta Electronica Sinica,2004,32(12):1992-1996. |
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| Authors: | WEN Hai-bo YU Hong-fang LI Le-min WANG Sheng |
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| Affiliation: | Dept.Electron.& Info.Eng.,Huazhong University of Science & Technology,Wuhan,Hubei 430074,China |
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| Abstract: | In this paper,the survivability problem for WDM grooming mesh networks is investigated.Based on layered graph,a dynamic shared-path protection with traffic grooming capability(SPPTG)algorithm is proposed.Taking the network topology information,current network resources and the arriving low-rate connection request into account,the cost of each link is dynamicaeey modified,and two link-disjoint paths are found:one is the working path,the other is the protection path.SPPTG can also guarantee the protection paths to share the protection resources as effectively as possible.Simulation results show that SPPTG algorithm has good performance and can efficiently share the protection resources. |
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| Keywords: | traffic grooming WDM network shared-path protection routing and wavelength assignment layered graph |
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