Comparing Slow Fading Channels for Adaptive Equalization and Channel Estimation

Abstract: Fading channels are multiplicative noise channels and results in spurts of inaccuracies in symbol detection. In this paper we ascertain BER and constellation plots using QPSK modulation for Rayleigh fading channels. Effects of different fading channels on an image are to be examined. Pilot based channel estimation technique proves to be the most operative amongst several available and equalizers are intended to reimburse channel distortions. To study the effect a wireless communication simulator is formed that includes flat fading and frequency selective channel models, adaptive equalization, channel estimation and demodulation. Improvement in the performance of slow Rayleigh fading channel is shown in result.

Keywords: Flat fading, Frequency selective fading, Slow fading, Channel estimation, LMS, RLS.