Research On Pilot Aided OFDM System Under Hyper-Rayleigh Fading Channel

Wireless radio propagation channel is widely known as the most hostile communication channel. Modeling and simulation of wireless fading channel has been an essential issue in the design of communication system. Rayleigh fading and Rician fading model are the most commonly used small scale models in wireless communication. However, recent research shows that some WSN applications where sensor nodes deployed within cavity environment suffer from more severe fading than Rayleigh fading predicted, which is referred to as hyper-Rayleigh fading. Therefore, design of a more applicable model is necessary to describe hyper-Rayleigh fading.Two-wave with diffuse power (TWDP) model is suggested to be the proper model to represent hyper-Rayleigh fading behavior. However, little effort has been made to evaluate the anti-interference capacity of OFDM system under hyper-Rayleigh fading channel.In the thesis, the characteristic of hyper-Rayleigh fading is explored and analyzed. Furthermore, performances of OFDM system with various pilot aided channel estimation techniques under hyper-Rayleigh fading are investigated. Simulation results indicate hyper-Rayleigh fading exhibits worse fading phenomena than Rayleigh fading when parameters Δ and K exceed certain values. OFDM system with2-D channel estimation demonstrates strong resistance to multipath fading, thus can be regarded as a promising candidate of WSN applications under hyper-Rayleigh fading.