A 5.5 GHz Channel Sounder for Fixed Wireless Channels

Abstract: This paper describes a channel sounder based on correlation of a maximum-length sequence. The sounder is designed for the evaluation of the absolute path loss and multipath delay spread of a fixed wireless local loop channel at 5.5 GHz. The sounder uses two stage down conversion with the second stage and subsequent processing being done in software, resulting in relatively simple hardware. Following explanation of the motivation for the work, a brief review of channel sounding techniques is given. The maximum-length sequence method is explained and the sounding system described. The method used for amplitude distortion correction. is summarised. Finally, some example results are presented. 1. MOTIVATION FOR TH