无线电通信技术
無線電通信技術
무선전통신기술
Radio Communications Technology
2015年
6期
37-40
,共4页
衰落信道%Nakagami-m参数%基于导频信号的信道参数估计%最大似然估计
衰落信道%Nakagami-m參數%基于導頻信號的信道參數估計%最大似然估計
쇠락신도%Nakagami-m삼수%기우도빈신호적신도삼수고계%최대사연고계
fading channel%Nakagami-m parameter%maximum likelihood estimate
多径衰落信道估计是移动通信系统在实际环境中为了提高接收机性能而迫切需要解决的问题。Nakagami?m参数估计方法主要有盲估计和基于导频信号的信道参数估计方法,重点研究了基于最大似然的Nakagami?m参数盲估计方法,该方法充分利用了最大似然估计是一种最优选择原理,当其概率密度函数取最大值时,可以把 m 的期望值作为其参数估计值,由此无需导频信号而直接估计出系统的信道系数。理论分析和仿真试验均证明了该方法在噪声环境下的可行性和适用性。
多徑衰落信道估計是移動通信繫統在實際環境中為瞭提高接收機性能而迫切需要解決的問題。Nakagami?m參數估計方法主要有盲估計和基于導頻信號的信道參數估計方法,重點研究瞭基于最大似然的Nakagami?m參數盲估計方法,該方法充分利用瞭最大似然估計是一種最優選擇原理,噹其概率密度函數取最大值時,可以把 m 的期望值作為其參數估計值,由此無需導頻信號而直接估計齣繫統的信道繫數。理論分析和倣真試驗均證明瞭該方法在譟聲環境下的可行性和適用性。
다경쇠락신도고계시이동통신계통재실제배경중위료제고접수궤성능이박절수요해결적문제。Nakagami?m삼수고계방법주요유맹고계화기우도빈신호적신도삼수고계방법,중점연구료기우최대사연적Nakagami?m삼수맹고계방법,해방법충분이용료최대사연고계시일충최우선택원리,당기개솔밀도함수취최대치시,가이파 m 적기망치작위기삼수고계치,유차무수도빈신호이직접고계출계통적신도계수。이론분석화방진시험균증명료해방법재조성배경하적가행성화괄용성。
Multipath fading channel estimate is a problem,which needs to be solved as soon as possible,for the mobile communica?tion system for the sake of enhancing receiver performance in practical environment. Nakagami?m parameter estimate methods mainly comprise blind estimate and channel parameter estimate based on pilots. This thesis focuses on the research of Nakagami?m parameter blind estimate method on the basis of maximum likelihood.This method takes full advantage of the maximum likelihood estimation as an optimal choice principle.When probability density function takes the maximum value,the expected value of m can be used as its param?eter estimated value. Therefore the channel parameter of the system can be directly estimated without pilot signal. The feasibility and applicability of this method in noise circumstances have been proved by both theoretical analysis and simulation test.