This book is based on the outcome of the research which was conducted using National Instrument LabView software with the use of VST 5644R kit Simulator. We study the behavior WLAN Network. First we design the link of WLAN Network by Labview software. Further we study the investigate the WLAN Uplink and Downlink Network. In this we check the performance of WLAN by using the different parameters modulations, bandwidth. This work provides an experimental analysis to these WLAN communication systems and explains how such capacity gains can be achieved using this technology. The main objective of the paper was to exploit the use of USRP hardware in the applications like spectrum sensing, RF Signal analysis. This work deals with spectrum monitoring and spectrum reconstruction for cognitive radio based wireless systems. The main advantage of equipment-based spectrum sensing is to perform more accurate quick and semi-continuous measurements.