大頻偏低信噪比下DS/SS系統(tǒng)中的擴頻序列捕獲研究
Investigation of PN acquisition under large frequency offset and low signal to noise ratio in DS/SS systems
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摘要: 該文研究大頻偏低信噪比情況下DS/SS系統(tǒng)中的序列捕獲問題，介紹了一種基于非相干序貫檢測算法的捕獲結(jié)構(gòu)。主要考慮了頻偏和GOLD碼部分相關(guān)對參數(shù)選擇的影響。理論分析和計算機仿真結(jié)果均表明，采用這種結(jié)構(gòu)，在低信噪比和較大的頻偏下能得到較好的捕獲效果，而且其實現(xiàn)的復(fù)雜度不高。
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關(guān)鍵詞:
- 序列捕獲; 序貫檢測; 頻偏; 部分相關(guān)
Abstract: This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems. The emphasis is put on the effect of frequency offset and partial correlation of GOLD sequence on parameters. It is shown by the theoretical analysis and computer simulation that the good acquisition performance can been achieved. And this structure can been implemented with moderate complexity. -
H.M. Kwon, Third-generation TDRSS-compatible direct-sequence spread-spectrum digital receiver, IEEE Trans. on Vehicular Technology, 1997, 46(4), 891-899.[2]Jia-Chin Lin, Noncoherent SPRT-based acquisition scheme for DSSS, IEEE Electronics Letters,1998, 34(13), 1290-1291.[3]Yong-Hwan Lee, Seung-Jun Kim, Sequence acquisition of DS-CDMA systems employing gold sequences, IEEE Trans. on Vehicular Technology, 2000, 49(6), 2397-2404.[4]J.J. Bussgang, D. Middleton, Optimum sequential detection of signals in noise, IRE Trans.Inform. Theory, 1955, IT-1(1), 5-18.[5]J.K.霍姆斯,著,梁振興,蔡開基,譯,相干擴展頻譜系統(tǒng),北京,國防工業(yè)出版社,1991,10,522-539. -
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