任意中頻帶通信號多相數(shù)字下變頻方法
Polyphase based digital downconvertion of random if signals
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摘要: 基于多相結(jié)構(gòu)的數(shù)字下變頻方法由于其可實(shí)現(xiàn)性強(qiáng),抗干擾能力強(qiáng)等優(yōu)點(diǎn),在電子系統(tǒng)軟件化的趨勢中得到越來越多的重視。其缺點(diǎn)是存在信號接收盲區(qū)。該文在多相濾波數(shù)字下變頻方法的基礎(chǔ)之上,提出了一種改進(jìn)方法。該方法在不改變原有下變頻器結(jié)構(gòu)的前提下,實(shí)現(xiàn)監(jiān)視帶內(nèi)任意中頻位置帶通信號接收,消除接收盲區(qū)。
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關(guān)鍵詞:
- 多相濾波; 下變頻; 帶寬; 盲區(qū)
Abstract: Polyphase based digital downconvertion is widely used in software electronic system design because it is easy to be realized and also has anti-jamming ability. But this method has blind frequency zone. This paper proposes a new method based on polyphase digital downconvertion which can eliminate the blind frequency zone and realize the receiving of any IF bandpass signal without changing the structure. -
楊小牛等,軟件無線電原理與應(yīng)用,北京,電子工業(yè)出版社,2001年,4.2節(jié),5-7.[2]Joseph Mitola, III, Software radio architecture: A mathematical perspective, IEEE J. on Selected Areas in Communications, 1999, 17(4), 514-538.[3]R.G. Vaughan, The theory of bandpass sampling, IEEE Trans. on SP, 1991, 39(9), 1973-1984.[4]胡廣書,數(shù)字信號處理,北京,清華大學(xué)出版社,1998年4月,290-293.[5]J. Fudge, M. Legako, C. Sehreiner, An approach to efficient wideband digital downconvertion,Proc. ICSPAT, Toronto, Canada. 1998, 713-717.[6]高志成,肖先賜,寬帶數(shù)字下變頻的一種高效實(shí)現(xiàn)結(jié)構(gòu),電子與信息學(xué)報,2001,23(3),255-260.[7]P.P. Vaidyanathan, Multirate digital filters, filter banks, polyphase networks, and applications:A tutorial, Proc IEEE, 1990, 78(1), 56-93. -
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