电子学报 ›› 2012, Vol. 40 ›› Issue (9): 1904-1908.DOI: 10.3969/j.issn.0372-2112.2012.09.033

• 科研通信 • 上一篇    下一篇

基于阈值处理的TD-SCDMA下行多用户信道估计方法

赵德香, 马秀荣, 白媛, 程云翔   

  1. 天津理工大学计算机与通信工程学院薄膜电子与通信器件天津市重点实验室, 天津 300384
  • 收稿日期:2011-08-09 修回日期:2012-02-15 出版日期:2012-09-25
    • 作者简介:
    • 赵德香 女,1986年3月出生于山东日照,2009年获得烟台大学工学学士学位,现为天津理工大学薄膜电子重点实验室硕士研究生,从事新一代移动通信信道估计算法方面的研究. E-mail:huoshanxiangxiang@163.com 马秀荣 女,1961年9月生于河北张家口,教授、博士生导师,政协委员.1983年在西安电子科技大学获得工学学士学位,2005年在南开大学获得博士学位.主要从事移动通信、光纤传感与光 纤通信等方面的研究工作.
    • 基金资助:
    • 天津市科技创新专项基金; 大唐移动资助项目 (No.10FDZDGX00400)

A Multi-User Channel Estimation Method Based on Threshold Processing for the Downlink of TD-SCDMA

ZHAO De-xiang, MA Xiu-rong, BAI Yuan, CHENG Yun-xiang   

  1. Tianjin Key Laboratory of Film Electronic and Communication Device, Computer and Communication Engineering Department, Tianjin University of Technology, Tianjin 300384, China
  • Received:2011-08-09 Revised:2012-02-15 Online:2012-09-25 Published:2012-09-25
    • Supported by:
    • Tianjin Special Fund for Science and Technology Innovation; Program supported by DTmobile (No.10FDZDGX00400)

摘要: 阈值后处理是针对TD-SCDMA系统中B Steiner信道估计器受加性噪声影响而提出的一种去噪方法,该方法误滤除信息径,保留噪声径.本文提出一种基于阈值处理的多用户信道估计方法,它基于某一下行用户会收到所有其它下行用户的训练序列这一特性,设定一个值,与各用户幅度加权值比较,去掉信噪比很小的用户对应的信道估计窗,将其余用户的信道估计窗进行平均,然后将平均后的结果再进行阈值后处理,抑制由噪声贡献的信道响应.仿真结果表明,提出的方法与直接进行阈值后处理法在同一误码率下,所需平均信噪比(SNR)降低1~4dB;在SNR低于5dB时,与复杂度高的加权合并法具有相同的误码率.

关键词: TD-SCDMA, B Steiner估计器, 信道估计, 信道估计窗平均, 阈值后处理

Abstract: Because channel estimator proposed by B Steiner for TD-SCDMA system is mainly affected by additive noise,those methods using threshold processing is likely to filter out the paths containing strong information whereas the path with noise is falsely kept.Based on the characteristics that a specific user can receive the training sequences of all the downlink users,a multi-user channel estimation method based on threshold processing was proposed.By comparing the amplitude weighted values with a given value,the method firstly removed some channel estimation windows whose Signal Noise Ratio(SNR) were too small,then averaged the rest of the channel estimation windows,and finally,processed the averaged results with threshold processing method to suppress the channel response contributed by noise.Simulation results show that at the same bit error rate,the average SNR required in the proposed method is 1~4dB lower than that in the direct threshold processing method;When SNR is lower than 5dB,the proposed method has the same performance as the weighted-unit method with high complexity.

Key words: TD-SCDMA, B Steiner estimator, channel estimation, average channel estimation values, threshold processing

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