摘要
到达时延(TOA)和到达时延差(TDOA)定位算法是无线定位中应用最广泛的2种方法,TOA测量值的准确获取将影响定位的精确度。正交频分复用(OFDM)是实现无线多媒体通信的关键技术,利用OFDM信号的导频子载波所携带的信息,参考均匀线列阵的DOA估计过程,提出将MUSIC子空间法应用到OFDM信道的时延估计上。给出了OFDM符号内导频子载波分布的相关条件,对提出算法进行仿真实验,可以看出,导频子载波个数的增加和导频子载波间隔的扩大都可以提高估计精确度。
Time-Of-Arrival(TOA)-and-Time-Difference-Of-Arrival(TDOA)-methods-are-two-main-methods-in-wireless-location.-How-to-get-accurate-TOA-measurements-is-a-key-factor-to-realize-high-accuracy-mobile-location.-Orthogonal-Frequency-Division-Multiplexing(OFDM)-is-one-key-technology-in-wireless-multimedia-communication.-By-taking-advantage-of-the-information-carried-out-by-pilot-subcarriers-of-the-OFDM-signal,-and-referring-to-the-DOA-estimate-for-uniform-linear-array,-MUSIC(Multiple-Signal-Classification)-subspace-algorithm-is-applied-to-time-delay-estimation-of-OFDM-channel.-Related-conditions-for-distribution-of-pilots-within-OFDM-symbol-are-given,-and-simulation-is-performed-on-the-proposed-algorithm.-It-can-be-seen-that-the-increase-of-the-number-of-pilot-sub-carriers-and-the-expanding-of-pilot-sub-carriers-spacing-can-improve-the-estimation-accuracy.
出处
《太赫兹科学与电子信息学报》
2014年第4期533-538,共6页
Journal of Terahertz Science and Electronic Information Technology
关键词
正交频分复用
到达时延
多径信道
子空间算法
Orthogonal Frequency Division Multiplexing
Time Of Arrival
multipath channel
subspace algorithm
