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Efficient DS-UWB MUD Algorithm Using Code Mapping and RVM

机译：使用代码映射和RVM的高效DS-UWB MUD算法

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摘要

A hybrid multiuser detection (MUD) using code mapping and a wrong code recognition based on relevance vector machine (RVM) for direct sequence ultra wide band (DS-UWB) system is developed to cope with the multiple access interference (MAI) and the computational efficiency. A new MAI suppression mechanism is studied in the following steps: firstly, code mapping, an optimal decision function, is constructed and the output candidate code of the matched filter is mapped to a feature space by the function. In the feature space, simulation results show that the error codes caused by MAI and the single user mapped codes can be classified by a threshold which is related to SNR of the receiver. Then, on the base of code mapping, use RVM to distinguish the wrong codes from the right ones and finally correct them. Compared with the traditional MUD approaches, the proposed method can considerably improve the bit error ratio (BER) performance due to its special MAI suppression mechanism. Simulation results also show that the proposed method can approximately achieve the BER performance of optimal multiuser detection (OMD) and the computational complexity approximately equals the matched filter. Moreover, the proposed method is less sensitive to the number of users.
机译：针对直接访问超宽带（DS-UWB）系统，开发了基于相关向量机（RVM）的基于代码映射和错误代码识别的混合多用户检测（MUD），以应对多址干扰（MAI）和计算问题。效率。在以下步骤中研究了一种新的MAI抑制机制：首先，构造代码映射（一种最佳决策函数），然后通过该函数将匹配滤波器的输出候选代码映射到特征空间。在特征空间中，仿真结果表明，由MAI引起的错误代码和单个用户映射代码可以通过与接收器SNR相关的阈值进行分类。然后，在代码映射的基础上，使用RVM将错误的代码与正确的代码区分开，并最终对其进行纠正。与传统的MUD方法相比，该方法由于其特殊的MAI抑制机制而可以大大提高误码率（BER）性能。仿真结果还表明，该方法可以近似实现最优多用户检测（OMD）的BER性能，并且计算复杂度近似等于匹配滤波器。而且，所提出的方法对用户数量不太敏感。

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  • 来源
    《Mathematical Problems in Engineering》 |2016年第2期|1930541.1-1930541.9|共9页
  • 作者

    Shi Pingyan; Liu Xiaohui; Tao Xiaofeng; Ji Jianchao;

  • 作者单位

    China Acad Space Technol, Xian Branch, Xian 710100, Peoples R China;

    Harbin Inst Technol, Sch Elect & Informat Engn, Harbin 150001, Peoples R China|China Acad Space Technol, Inst Telecommun Satellite, Beijing 100000, Peoples R China;

    China Acad Space Technol, Xian Branch, Xian 710100, Peoples R China;

    China Acad Space Technol, Xian Branch, Xian 710100, Peoples R China;

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