本文選題：空間譜 + 到達角估計�。� 參考：《天津大學》2014年碩士論文

【摘要】：當前無線通信環(huán)境日趨復雜,獨立信號和相干信號經(jīng)常同時存在于無線信道中,而絕大多數(shù)現(xiàn)有的到達角估計技術都是只針對獨立信號或相干信號進行研究的。在這種情況中,只針對獨立信號的到達角估計算法不再適用。只針對相干信號的算法雖仍然有效,但會把獨立信號和相干信號一起進行解相干處理,這樣會進一步增大天線陣列的陣列孔徑損失。同時,獨立信號和相干信號之間也會相互干擾,降低算法的估計性能。本文針對混合信號的情況,提出了一種分步估計信號到達角的改進算法。該算法首先利用傳統(tǒng)MUSIC算法估計獨立信號的到達角,然后在信號協(xié)方差矩陣中分離出相干信號的協(xié)方差矩陣,只對相干信號進行空間平滑處理,進而估計出相干信號到達角。綜合兩步的結果,得到混合信號的全部到達角參數(shù)。相比傳統(tǒng)空間平滑算法,本文算法創(chuàng)新點在于:新算法將獨立信號和相干信號分開處理,在保持良好到達角分辨率的同時,避免了陣列孔徑的不必要損失,減小了對天線陣列數(shù)的要求,在信噪比較低的情況下?lián)碛懈_的估計性能。
[Abstract]:At present, the wireless communication environment is becoming more and more complex, independent signals and coherent signals often exist simultaneously in wireless channels, and most of the existing angle of arrival estimation techniques are only focused on independent signals or coherent signals. In this case, the angle of arrival estimation algorithm for independent signals is no longer applicable. Although the algorithm for coherent signals is still effective, it will decoherently process the independent signals and coherent signals together, which will further increase the array aperture loss of the antenna array. At the same time, the independent signal and coherent signal also interfere with each other, which reduces the estimation performance of the algorithm. In this paper, an improved step-by-step algorithm for estimating the arrival angle of mixed signals is proposed. Firstly, the traditional music algorithm is used to estimate the angle of arrival of the independent signal, then the covariance matrix of the coherent signal is separated from the signal covariance matrix, and only the coherent signal is processed by spatial smoothing, and the angle of arrival of the coherent signal is estimated. All the parameters of the angle of arrival of the mixed signal are obtained by synthesizing the results of the two steps. Compared with the traditional spatial smoothing algorithm, the innovation of this algorithm is that the new algorithm processes the independent signal and the coherent signal separately, while keeping the good angular of arrival resolution and avoiding the unnecessary loss of the array aperture. The requirement of antenna array number is reduced, and the estimation performance is more accurate under the condition of low SNR.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN911.23

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本文編號：2083789