The Design And Implementation Of Sc-fde 64QAM Data Link

Soft Defined Radio has the advantages of programmability, configurability and modularization, so it is widely used to realize general digital communication system based on SDR in the teaching demonstration and research validation.Therefore, this paper presents the single carrier frequency domain equalization64 QAM data link and completes the demonstration and verification based on the uSDR platform independent developed by our laboratory. Major work in this paper is as follows:Firstly, the paper designs the SC-FDE 64 QAM data link. Key technologies of the data link are investigated in engineering view and the physical frame structure is designed referring to other commonly used data link according to the functional requirements and performance requirements of the project. The data rate is32.8704 Mbps of the SC-FDE 64 QAM data link. The duration of each frame is 10 micro second. In this paper, the whole data link can be divided into two parts including the transmitter and the receiver. The implementation of the algorithm and process flow are given for each module of the data link.Secondly, the paper completes the graphical development of SC-FDE 64 QAM data link. This paper uses the graphical development tools System Generator provided by Xilinx Company to complete the development of the SC-FDE 64 QAM data link. Key modules of the waveform such as digital up converter and digital down converter module, time and frequency synchronization module, encoding module, modulation and demodulation module are implemented on the FPGA. The bit error performance and time synchronization performance simulation of the waveform are given at the last.Thirdly, the paper demonstrates and verifies the SC-FDE 64 QAM data link. This paper completes the function test and performance test including file transfer test, bit error rate test, time and frequency synchronization test. The test result demonstrates that the performance of implementation satisfies the design criterion of the data link and achieves a better balance between the performance and resource consumption under the experimental environment.In conclusion, this paper completes the SC-FDE 64 QAM data link design,implementation and verification. The data link provides some common signal processmodules and can be applied to communication teaching demonstration and verification.Meanwhile, it enriches the SDR communication waveform libraries and provides reference to more sophisticated data link development in the future.