摘要
针对无人机信道的特点,以及采用正交频分复用技术进行无人机数据链路传输的优点。在对OFDM关键技术信道估计进行研究时,要确保接收端能够准确的检测出由于无线信道变化造成的码间干扰,准确的解调出原信号。根据系统需要设计了梳状导频和块状导频联合的导频插入方式,该方式可以在数据传输和信道估计性能上做到折中,并对常用的信道估计算法进行分析研究提出了改进的最小均方误差信道估计算法,最后建立频率选择性信道模型对不同的信道估计算法进行仿真,分析仿真结果可以看出该导频插入方式和信道估计算法具有较低的复杂度,而且又具有良好的信道估计性能,适合在实际系统中应用。
This paper describes the characteristics of unmanned aerial vehicle （UAV） channel and the advantages when adopting orthogonal frequency division multiplexing to link transmission of UAV data. When researching the key technology channel estimation of OFDM, it is necessary to make sure that the receiver can accurately detect the intersymbol interference resulting from the changes of wireless channel and accurately demodulate the original signal. According to the needs of system, the way of pilot inserting combining the comb pilot with block pilot is designed, in which data transmission can compromise with channel estimation on performance. And the common channel estimation algorithm is studied to improve the minimum MSE channel estimation algorithm. Finally the frequency selectivity channel model is established to simulate different algorithms of channel estimation. The analysis of the simulation resuits shows that the insertion method of pilot and the algorithm of channel estimation have a low complexity and excellent channel estimation performance, so it is appropriate for application in actual system.
出处
《计算机仿真》
CSCD
北大核心
2009年第8期41-44,共4页
Computer Simulation
