Research And Engineering Implementation Of Several Techniques On Software Defined Radio Receiver Front-end

With the rapid development of electronic technology and wireless communication technology, software defined radio has become the main research direction in the field of wireless communication. Software defined radio receiver front-end based on common hardware platform, through the change of software to adapt to various communication standards flexibility. In this article, from the point of view of the parameters reconfiguration of the software defined software receiver front-end, we will analyze the different problems and put forward the solution. And this article will give a detailed description of the problems that arise during the implementation of these methods.Firstly, the super heterodyne receiver front-end due to its internal frequency conversion structure is complex, the spectrum of digital IF signal of the super heterodyne receiver front-end is flipped, in order to solve this problem, the digital IF signal recovery algorithm is used to restore the IF signal, this algorithm can realize the frequency selective turning over for digital IF signal, at the same time,it can improve the quality of digital IF signal. Then, we adopt a method that based on analysis to analyze the fix-point processing of this algorithm, and give a fixed point processing scheme, eventually, the algorithm is implemented on the general hardware platform.Secondly, based on the in-depth study to the digital channel processing, a digital channel structure with multi-rate and reconfigurable parameters is proposed, this kind of digital channel structure is more general and flexible than the traditional digital channel structure. Then, based on the detailed description of the principle of this digital channel structure, a engineering implementation of this digital channel processing structure, eventually, the test results are given.Finally, from two aspects of real-time control and data transmission, this paper builds the data exchange system of the software radio receiver front end. This system can not only realize the real-time configuration of the software radio receiver front-end, but also can observe the signal data in real time, greatly enhance the convenience and flexibility of the software radio receiver front-end.