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[ "兰駃,男,清华大学信息技术研究院无线与移动通信技术研究中心硕士生,主要研究方向为无线局域网接收算法,包括信道估计、MIMO检测和相位补偿等。" ]
[ "李云洲,男,清华大学信息技术研究院无线与移动通信技术研究中心副教授,主要研究方向为无线移动通信中的空时信号处理、信道估计、多用户检测、CDMA/OFDM同步算法等。" ]
[ "粟欣,男,清华大学信息技术研究院无线与移动通信技术研究中心教授,主要研究方向为宽带无线接入、无线与移动网络架构、自组织网络、软件定义无线电和协作通信等。" ]
[ "周世东,男,清华大学信息技术研究院无线与移动通信技术研究中心首席科学家、教授、博士生导师,主要研究方向为无线移动通信和宽带无线传输技术,包括移动通信系统、分布式无线通信系统、无线信道传播特性、控制业务分离的柔性覆盖、无线资源管理与控制、高能效无线网络等。" ]
网络出版日期:2015-08,
纸质出版日期:2015-08-20
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兰駃, 李云洲, 粟欣, 等. 基于实测的WLAN系统导频位置优化设计[J]. 电信科学, 2015,31(8):113-118.
Jue Lan, Yunzhou Li, Xin Su, et al. Pilot Position Optimization Design of WLAN System Based on Experiment[J]. Telecommunications science, 2015, 31(8): 113-118.
兰駃, 李云洲, 粟欣, 等. 基于实测的WLAN系统导频位置优化设计[J]. 电信科学, 2015,31(8):113-118. DOI: 10.11959/j.issn.1000-0801.2015193.
Jue Lan, Yunzhou Li, Xin Su, et al. Pilot Position Optimization Design of WLAN System Based on Experiment[J]. Telecommunications science, 2015, 31(8): 113-118. DOI: 10.11959/j.issn.1000-0801.2015193.
针对IEEE 802.11ac“利用前导序列符号+梳状导频”的帧结构,推导出基于最大似然估计的校正方案性能评估公式。基于该公式分析了导频位置选择、信道衰落及子载波间相关性对校正性能的影响。提出了一种信令交换方式,可以实现收发端优化导频位置同步,并根据信道响应的幅度信息,设计了一种低复杂度的导频位置优化的方案,能够在保证性能不损失的情况下,节省导频开销。仿真与实测的结果显示,对于理想瑞利信道数据,校正性能在信道幅度信息未知和已知的情况下分别提升1.85 dB和7.15 dB;对于实测信道数据,则分别提升1.67 dB和2.68 dB。
Considering the frame structure of IEEE 802.11ac with “leading preamble plus comb-like pilot”,the performance evaluation formula of the correction scheme based on maximum likelihood estimation was derived,according to which the effect of pilot location,channel fading and subcarrier correlation was studied.Furthermore,a signalling exchange method was proposed,which ensured pilot position synchronization on both end,and a low complexity algorithm of pilot optimization according to the frequency channel amplitude information.In this way,the pilot overhead can be reduced without loss of correction performance.The experiment and simulation result shows that for ideal Rayleigh channel data,correction performance improves by 1.85 dB and 7.15 dB for unknown channel amplitude information in frequency domain and known cases respectively.For field experiment channel data,correction performance improves by 1.67 dB and 2.68 dB respectively.
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