International Journal of Applied Engineering Research ISSN 0973-4562 Volume 9, Number 22 (2014) pp. 10281-10286 © Research India Publications http://www.ripublication.com Paper Code: 27039-IJAER A Qualitative Analysis of Rayleigh Faded Frequency Selective Channel Simulator S. Venkateswarlu 1 and Dr. Sastry JKR 2 1 Research Scholar, Department of ECE, KL University, Vaddeswaram–522 502, A.P., India 2 Professor, Department of CSE, KL University, Vaddeswaram–522502, A.P., India E-mail: somu23@kluniversity.in, 2sastryjkr2002@yahoo.co.in Abstract When a complex-valued signal is transmitted through a frequency selective fading channel with complex low-pass equivalent, the time variant channel impulse response will have two components viz. a direct component and a dispersive Rayleigh faded component. The received signal, which is a random process, will consist of vector sum of different waves received after reflections by Ionosphere layers from a number of paths. When the impulse response of channel is modeled as zero means complex valued Gaussian process, the envelope of it at any instant “t” is Rayleigh distributed. Keywords: Frequency Selective Channel, Rayleigh Fading, Ionosphere, Multi path transmission, Gaussian Process, DPSK. 1. Introduction Despite the advent of several other kinds of transmitting media such as satellite, optical fiber, coaxial cables etc., wireless continues to be used extensively owing to the fact that it is economical and flexible. An accurate assessment of the performance of a newly developed radio system can be done through repeated tests of the system over an simulator. The simulator proposed is accurate and a large range of channel conditions can be produced in a controlled manner. It is possible to compare the performance of several systems under the same channel conditions using this channel simulator.