This thesis concentrates on the analysis of sampling rate changing ( decimation and interpolation ) ; the discussion of basic multirate signal processing theory ; the implementation of high efficient algorithm , which provides the bases for other algorithm development in this thesis 本文從頻域的角度深入分析了抽樣率變換的規(guī)律,并進(jìn)一步研究了多抽樣率系統(tǒng)的高效實(shí)現(xiàn)方案和基本理論,為其它算法的研究提供了必要的基礎(chǔ)。
First , how to conduct sample and quantification of continuous time signal which is prior condition of sdr is explored in detail , and the comparison and analysis of some sample modes are given in which band pass signal sampling theorem is most important . second , multi - sample rate signal processing which is an important basis of sdr is studied . emphasis are put on decimation and interpolation those are the most fundamental process and the realization of decimation and interpolation filter 在基于中頻采樣的軟件無線電結(jié)構(gòu)框架下,首先詳細(xì)探討了軟件無線電的前提條件,即如何對(duì)連續(xù)時(shí)間信號(hào)進(jìn)行采樣量化,比較分析了幾種采樣的方式,其中最為重要的是帶通信號(hào)采樣定理;然后探討了軟件無線電的一個(gè)重要基礎(chǔ),即多采樣率信號(hào)處理,重點(diǎn)討論其最基本的兩個(gè)過程抽取和內(nèi)插以及抽取器和內(nèi)插器的實(shí)現(xiàn);接著介紹了結(jié)構(gòu)簡(jiǎn)單、適用于一級(jí)抽取的cic濾波器和適用于做2倍抽取的半帶濾波器;再次論文在總結(jié)了傳統(tǒng)的調(diào)制解調(diào)基礎(chǔ)上,結(jié)合軟件無線電器件的特點(diǎn),系統(tǒng)的探討并實(shí)現(xiàn)了基于正交思想的am 、 fm 、 ask 、 fsk 、 bpsk 、 qpsk的正交調(diào)制解調(diào)算法。