一种室内信道下改善UWB图像传输系统性能的方法

A Selective Approach to Improving the Performance of UWB Image Transmission System over Indoor Fading Channels

文章在主要分析了室内衰落信道模型及TH-PPM(跳时脉冲位置调制)UWB系统模型的基础上,提出了一种用于在已知室内衰落信道的情况下提高UWB图像传输系统通信性能的方法,即将发送图像数据分为主要数据和次要数据,在信道良好的情况下,传输主要数据;在信道较差的情况下,传输次要数据。在不损害传输速率的情况下提高UWB图像传输系统的通信性能。系统仿真的结果显示,在SNR为5dB时,选择传输的接收图像的PSNR比未做选择传输的接收图像改进约7dB。

This paper proposes a selective approach to improving the performance of time hopping PPM UWB image transmission system over indoor fading channels. The image information is divided as basic information and elementary information. The proposed approach transmits basic information with good channel condition, while the elementary information with fairly poor channel condition. Simulations have proved the improvement. The PSNR （Peak Signal to Noise Ratio） of selective transmission system has a gain of almost 7 dB over non-selective system.