小波分析在软件无线电中的应用

软件无线电的发展，对调制解调技术提出了越来越高的要求。基于DFT的多音调制解调方案，虽然在一定程度上克服了传统方法的局限性，但各信道间存在较大的频谱重叠，容易引起码间串扰。该文在研究小波理论的基础上，根据软件无线电的特点，提出了一种基于离散小波变换技术的软件无线电的调制解调方案。这种方案利用小波变换特殊的优越性，使得各子信道之间的频谱分隔特性大大改善，并在码间干扰严重的情况下，仍然具有较好的传输性能。

Application of wavelet analysis in software radio

With the development of software radio, the requirement for technology of modulation and demodulation is higher and higher. Though the project based on DFT gets over the limitation of traditional method, but the frequency spectrums of channels still overlap badly among different channels and this will cause inter-symbol interference (ISI) easily. Under researching the theory of wavelet transform, this paper puts forward a modulation and demodulation scheme of software radio based on discrete wavelet transform. This scheme makes use of the advantages of wavelet to improve the frequency spectrum compart character between different channels, the transmission is very well even under the badly ISI condition.