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清华大学学报(自然科学版)  2017, Vol. 57 Issue (1): 61-66    DOI: 10.16511/j.cnki.qhdxxb.2017.21.012
  电子工程 本期目录 | 过刊浏览 | 高级检索 |
毫米波无线通信中的定时跟踪方案
牛勇1, 冯子奇2, 李勇2, 金德鹏2, 苏厉2
1. 北京交通大学 轨道交通控制与安全国家重点实验室, 北京 100044;
2. 清华大学 电子工程系, 信息技术国家实验室(筹), 北京 100084
Timing tracking methods in millimeter-wave wireless communications
NIU Yong1, FENG Ziqi2, LI Yong2, JIN Depeng2, SU Li2
1. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China;
2. Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
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摘要 为了解决毫米波无线通信中模数转换器(analog to digital converter,ADC)无法在接收信号上实现高倍的过采样以及多径影响所导致的定时跟踪问题,该文基于2倍过采样数据,根据相关波形,利用Farrow插值给出2种适用于多径信道的定时跟踪方案,分别在频域均衡之前和之后进行误差精补偿。仿真结果表明:在Rummler信道下,定时频偏为时钟频率的20×10-6、误比特率为10-5时,这2种方案的信噪比(signal-to-noise ratio,SNR)与无定时频偏时的只相差2.5 dB左右,说明这2种方案在多径信道下具有良好的定时跟踪性能。
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牛勇
冯子奇
李勇
金德鹏
苏厉
关键词 毫米波无线通信E-频段多径信道定时跟踪方法频域均衡    
Abstract:The timing tracking of millimeter-wave wireless communications is very challenging since the analog to digital converters (ADCs) cannot provide high oversampling on the received signals and the multi-path channel causes tracking problems. Two timing tracking schemes based on twice over-sampled data and the waveform of the correlation values using Farrow interpolation are described in this paper for multi-path channels. The first scheme compensates for the timing error before channel equalization while the other compensates afterwards. Simulations show that with a timing error of 20×10-6 and a bit error rate (BER) of 10-5, the difference in the signal-to-noise ratios (SNRs) between these two systems and a system with no timing error is about 2.5 dB less than with the Rummler channel. Thus, both schemes provide good timing tracking for multi-path channels.
Key wordsmillimeter-wave wireless communications    E-band    multi-path channels    timing tracking methods    frequency domain equalization (FDE)
收稿日期: 2016-04-12      出版日期: 2017-01-20
ZTFLH:  TN928  
引用本文:   
牛勇, 冯子奇, 李勇, 金德鹏, 苏厉. 毫米波无线通信中的定时跟踪方案[J]. 清华大学学报(自然科学版), 2017, 57(1): 61-66.
NIU Yong, FENG Ziqi, LI Yong, JIN Depeng, SU Li. Timing tracking methods in millimeter-wave wireless communications. Journal of Tsinghua University(Science and Technology), 2017, 57(1): 61-66.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.21.012  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I1/61
  图1 系统帧结构
  图2 均衡后实现的定时跟踪结构
  图3 均衡前实现的定时跟踪结构
  图4 2倍过采样时相关峰附近的相关点
  图5 接收端时钟频率高时的时钟脉冲调整
  图6 接收端时钟频率低时的时钟脉冲调整
  图7 两倍过采样时的Farrow插值原理
  图8 定时误差精补偿在均衡前后实现的性能比较
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