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An Efficient Noisy-ICA Based Approach to multiuser Detection in IDMA Systems

International Journal of Communications, Network and System Sciences 2010年第9期3卷 767-772页

作者： Abdelkrim Hamza Salim Chitroub Gérard Salut 不详

Interleaved Division multiple Access (IDMA) is a new access scheme that has been proposed in the literature to increase the capacity of wireless channels. The performance of such systems depends on the accuracy of the channel state information at the receiver. In this paper, a Noisy-Independent Component Analysis (N-ICA) based IDMA receiver for multiple access communication channels is proposed. The N-ICA component is applied as a post processor. Unlike other IDMA receivers, the proposed scheme detects and separates the transmitted symbols without channel state information tracking. The performance of the proposed technique is presented in terms of raw bit error rate (BER) without channel coding for different signal to noise ratios (SNR). Simulation results demonstrate that N-ICA post processor provides an improvement in performance in terms of bit error rate (BER) in loaded systems. When the system is not loaded, the proposed post processor presents the same performance as conventional IDMA receiver with less iterations leading to a complexity reduction.

关键词： IDMA ICA multi-user Detection

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MIMO multi Carrier Interleave Division multiple Access System with multiuser Detection: Performance Results

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International Journal of Communications, Network and System Sciences 2010年第4期3卷 413-417页

作者： Prabagarane Nagaradjane Sai N. Chandrasekaran Kuttathatti Srinivasan Vishvaksenan 不详

This paper provides the performance analysis of multi input multi output (MIMO) multi carrier (MC) interleaver based multiple-access system with multiuser detection. Interleave-division multiple access (IDMA) is a scheme in which users are separated by employing different interleavers instead of different signatures as in a conventional code-division multiple-access (CDMA) scheme. The basic principle of IDMA is that the interleaver is different for different users. Interleavers are generated independently and randomly. At the receiver, ZF, LLSE, VBLAST/ZF/MAP and VBLAST/LLSE/MAP detectors are employed. The performance of the system is analyzed for different channel conditions using extensive simulation runs based on Monte Carlo simulation trials. Simulation results divulge that VBLAST/LLSE/MAP detector results in significant performance amelioration compared to other detectors as applied to MC/IDMA system.

关键词： CDMA Channel Capacity Iterative Decoding multi-user Detection

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Blind Channel Estimation Algorithm of Uplink for MC-CDMA System

Blind Channel Estimation Algorithm of Uplink for MC-CDMA Sys...

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2003 International Conference on Communication Technology

作者： Bian Dongming Ran Chongsen Department of communication and engineering PLAUniversity of information and technology Zhengzhou China Yi Xinying Department of military simulation PLAUniversity of science and technology Nanjing China

A blind channel estimation algorithm of uplink is proposed in this paper by analyzing the received signal of uplink for MC-CDMA system. The proposed algorithm uses the second order statistics of the r

关键词： MC-CDMA channel estimation uplink multi-user

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用户行为模型驱动信息系统设计的研究

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图书馆学情报学 2010年第11期

作者：顾立平

在全面了解用户主导、用户驱动、以用户为中心的数字图书馆的基础上，系统地介绍用户模型指导系统功能、流程、交互方式等设计的多项细节。提出“用户心理与行为-数字服务-信息系统-市场调查-改进系统”的方式，优化数字图书馆服务系统。

关键词：用户建模用户生成多元用户个性化服务人机交互 user modeling user generated multi-user Personalized service Human-computer interaction

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