窄帶干擾環(huán)境下直擴信號偽碼的盲估計方法研究
Study on the DS-SS Signals Despreading without the PN Sequence under Narrow Band Interference
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摘要: 為了解決窄帶干擾條件下低信噪比直擴信號擴頻碼的盲估計問題，該文提出了一種直擴信號的相關矩陣累加平均結合矩陣特征分解的方法。該方法首先按照已獲知的直擴信號擴頻碼周期、碼速率等二次統(tǒng)計特性參數(shù)對接收信號進行取樣處理以獲得一個觀察向量集，接著用所提出的方法對該集合進行處理，其結果可以估計出信號所夾雜的窄帶干擾(以多音干擾為例)特征波形，同時還可以進一步估計出信號的擴頻碼序列。利用前者，可以進一步消除信號所夾雜的窄帶干擾，而利用后者則可以對接收信號實行盲解擴處理。理論分析和數(shù)值結果都表明了該方法非常有效，并能工作在較低的輸入信噪比和很低的信號干擾比環(huán)境下。Abstract: In this paper, an approach of eigen-analysis for DS-SS signals under narrow band (multiple tone) interference is proposed, which can estimate the PN (Pseudo Noise) sequence blindly in the low SNR(Signal Noise Ratio) and SIR(Signal Interference Ratio) DS-SS signals. Of course, the parameters of the DS-SS signals (such as period and chip interval of the PN sequence) need to be known. Firstly, the received signal is divided into a lot of non-overlapping temporal vectors according to the period of PN sequence, and then the correlation matrix of the vectors is calculated and accumulated. The eigenvalue decomposition of the matrixes can be computed and the narrow band interference waveforms and the PN sequences of the received signals from the main component eigenvectors can be blindly estimated in the end. Based on the estimated narrow band interference waveforms and PN sequences, the narrow band interference can be rejected, and the DS-SS signals despreading without the PN code can be realized too. Theoretic analysis and experimental results show that the approach is very effective. It can work well on the lower SNR and SIR ambient.
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張?zhí)祢U，周正中. 直擴信號偽碼周期的譜檢測[J]. 電波科學學報，2001，16(4)：518-521.[2]張?zhí)祢U，周正中. 直擴信號的普檢測和神經(jīng)網(wǎng)絡估計. 系統(tǒng)工程與電子技術, 2001，23(12)：12-15.[3]French C A, Gardener W A. Spread-spectrum despreading without the code[J].IEEE Trans. on Commun.1986, 34(4):404-407[4]孫麗萍，胡光銳. 直接序列擴頻通信中窄帶干擾抑制的奇異值分解方法[J].電子與信息學報.2003, 25(9):1290-1293瀏覽[5]Dixon R C. Spread Spectrum Systems (second edition), New York: John Wiley Sons, Inc: 1984. -
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