摘要： 为实现对临近空间通信信道的有效描述，提出一种临近空间信道几何模型，通过估算多径信道的参数，建立相应的信道仿真模型。在正交相移键控调制方案下，对信道的相位特性和误码性能进行仿真分析，结果表明，该模型与实际情况相符。当传输速率过大时，信道性能恶化，需要做进一步均衡处理。

关键词: 临近空间, 过量延时, 延时功率分布, 相干带宽, 平坦衰落, 频率选择性衰落

Abstract: In order to describe the near space communication channel efficiently, a simple near space channel geometric model is proposed. It estimates the parameters of the multipath channel, builds the corresponding channel simulation model, simulates and analyzes the phase and bit error ratio characteristics of the channel for the Quadrature Phase Shift Keying(QPSK) scheme, validates the correctness of the model. When the transmission rate is too high, the performance of the channel worsens and needs equalization in next step.

Key words: near space, excess delay, delay power distribution, coherence bandwidth, flat fading, frequency selective fading

中图分类号: 

• TP393