【摘要】 软件无线电平台中的数字上下变频部分是系统中运算量最大的部分,应用现有的专用器件往往不能满足人们的各种实际需要.为找到一种高效数字变频算法,在分析高效宽频带变频系统的基础上提出一种可以把变频部分与多种调制方式灵活结合在一起的方法,并以QAM调制为例,给出具体算法.分析结果表明,该方法降低了对处理速率的要求,提高了处理能力.证明了该方法的可行性.更多还原

【Abstract】 The digital down/up converter is one of the most important parts of the software defined radio platform.However,chips at present cannot satisfy the requirements of flexibility,accuracy and number of operation in performing the signal processing in software defined radio.In order to design an efficient and flexible DDC/DUC (system),this paper combined the signal processing of DDC/DUC with QAM system and presented a new (method) based on the analysis of this efficient broadband DDC/DUC system.QAM modulation was taken for example,and a detailed algorithm of a channel system with 0～30 MHz and 60 channels QAM was presented.The result shows that the method appears to be helpful to generalize the technique to other modulation systems and realize an efficient SDR communication platform.更多还原