Transmitting UWB-OFDM Using 16-QAM over Hybrid Flat Fading Channels

This paper derives a simulation based comparison for UWBOFDM with different multipath channel models. Several multipath channel models such as (AWGN, Rayleigh and Rician) has been simulated and compared with a proposed hybrid combination of Rayleigh, Rician and AWGN to observe a realistic multipath faded environment. These cases are based on no fading and flat Rayleigh- fading, multiple-diversity reception Rayleigh-fading, and flat Ricean-fading. These simulations are used to determine both signal to noise ratio and bit error rate for multi-amplitude constellations. The combination of Rayleigh and AWGN channels give BER and SNR of 0.5025 and 15.25dB respectively in flat fading mode, whereas combination of Rician and AWGN produces BER and SNR upto 0.4999 and 16.63dB. The proposed Hybrid combination of Rayleigh, Rician and AWGN produces a decay in BER and SNR approximately 2% and 3.5% respectively.