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中文摘要：
针对对流层散射通信存在严重的多径衰落的问题，分析了该多径信道的快衰落和慢衰落特性，并将对多径干扰有较好抑制作用的正交频分复用技术引入该散射通信中，建立了基于OFDM技术的对流层散射多径信道系统模型，对比分析并仿真了LS、LMMSE和基于DFT变换域法的信道估计算法下系统的误码性能，以及不同多径数目下采用D兀、变换域法的系统误码性能。仿真结果表明：基于DFT变换域法性能略优于LMMSE算法，明显优于LS算法；在不同多径数目条件下，为实现对流层散射信道的可靠通信，适当增加系统信噪比的同时，选择相对较少多径数目，有利于系统性能的提升。
英文摘要：
As to the severe muhi-path＇s fading problem in troposcatter communication, it studied channels＇ fast and slow fading characteristics and introduced orthogonal frequency division muhiplexing（OFDM） to the communication, which had the charac- teristic of combating fading in multi-path channels. It established the system model based on OFDM and studied error perfor- mances in different channel estimation algorithms contrastively, including LS, LMMSE and transform domain algorithm based on DFT. It also simulated error performances in different path number by taking DFT transform domain algorithm. The simulation resuits show that performances of DFT transform domain algorithm is better than LMMSE appreciably and LS obviously. In order to realize stable communication in troposcatter communication in different paths, choosing less number and higher the SNR will better the system performances.
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