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说明:  数字正交分解算法的研究 :在软件无线电接收机中,普遍采用了中频数字化方案。中频接收机的输入信号为一个带通模拟信号, 在进行信号解调前,必须先对其进行数字化正交处理,即将一个实信号变成两个正交数字序列。根据正交数字序 列,可以方便地提取信号瞬时参数,同时在一定程度上能克服因衰落或多普勒频移等因素而导致的信号失真。根 据A/D转换器在信号解调时所在位置和信号采样率的确定方式,对传统的基于Nyquist采样定理的模拟下变频法 和基于中频带通采样的Hilbe~滤波法、数字混频法和多相滤波法进行了研究。
(Abstract:The scheme of IF digital receiver is now often adopted in software radio.The input of the receiver is analogical band— pass signal,and beforeit’s demodulation,digital orthogonal decompositionmustbe done,thatistO conre_,1 a real sign al tO a coupleof orthogo~N digital sequ~lces.According tO that two sequences,the instantaneous characters can be extracted easily and also the de— modulated sign al can get over the~ign al distortion caused by signal path fading and Doppler shift.In this paper,the algorithms of or— thogonal decomposition through traditional an alogical down-eonverting frequency,Hilbert tran sform ,digital mixing an d polyphase fil— tering are studied in term of A/D converter’S position and the way to c}K)0Se sampling frequency.)

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数字正交分解算法的研究.pdf (273623, 2006-11-01)

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