基于CCSDS的自适应传输系统设计及实现

摘要

For the problem that the data transmission using fixed rate in deep space communication can affect the throughput of the system, an adaptive transmission scheme of transceiver based on CCSDS protocol standards is proposed.In this scheme, according to received signal quality, the symbol rate in the process of data transmission is changed dynamically.The SNR of the receiver is estimated in real time, then the signal transmission rate is adjusted to improve the communication quality and system throughput under the premise of ensuring the system symbol error rate.Furthermore, the system scheme is implemented and verified by using the Xilinx Virtex5 FPGA chip as the core of the hardware platform, and the throughput of the system is analyzed and compared.The result shows that the scheme of the system is simple in structure, and under the background of Gaussian white noise above 0 dB, it can achieve real time estimation of the SNR and make adaptive adjustment to the symbol rate of the whole system.%针对深空通信中采用固定速率进行数据传输会影响通信质量和系统吞吐量的问题, 提出了一种基于CCSDS协议标准的收发机自适应传输方案. 该方案主要根据接收信号的质量, 动态地改变数据传输的码速率, 即通过实时地估计接收端信噪比, 对信号传输速率做出调整, 从而在保证系统误码率的前提下提高系统的通信质量和吞吐量. 在此基础上, 利用以Xilinx Virtex5 FPGA芯片为核心的硬件平台对系统方案进行实现及验证, 并分析比较了系统吞吐量. 实验结果表明, 该系统方案实现结构简单, 在0 dB以上的高斯白噪声背景下, 能实现接收端信噪比的实时估计和整个系统速率的自适应调整.