Abstract:
Orthogonal Frequency Division Multiplex (OFDM) is a very suitable technique for achieving high-rate wireless data transmission. High spectral efficiency, robustness to channel fading, immunity to impulse interference and less nonlinear distortion are among the favorite properties of OFDM.
One major drawback of OFDM is high Peak to Average Power Ratio (PAPR) of the transmitted signal. The high peaks of an OFDM signal are distorted nonlinearly by the high power amplifier (HPA) because the HPA heavily distorts all signal parts that come close to or exceed saturation. The distortion causes inter carrier interference (ICI) and out-of-band (OOB) radiation. While ICI disturbs the transmitted signal, it degrades the bit error rate (BER). OOB radiation disturbs signals on adjacent frequency bands, so it should be avoided.
A PAPR reduction scheme based on joint Hadamard transform and Discrete Cosine Transform (DCT) with selected mapping (SLM) is proposed. The PAPR reduction performance and BER performance are evaluated by computer simulation. Simulation results state that the PAPR reduction performance is improved compared with selected mapping used only. On the other hand, the BER of system using proposed PAPR reduction scheme is not degraded.
Description:
Supervised by
Prof. Dr. Mohammad Rakibul Islam,
Department Of Electrical And Electronic Engineering (EEE),
Islamic University of Technology (IUT),
