Effects of high power amplifier and channel noise on Orthogonal Frequency Division Multiplexed signal

Communication plays very important role in day-today life of peoples. Due to fast growing age, more and more advancement takes place in the field of communication as signals are being sent in digital domain, which were initially sent in analog domain, for better transmission multi carrier communication is preferred over single carrier waves. OFDM is a multi carrier system, which is commonly implemented for transmission of signals now - a - days. In the OFDM system, orthogonally placed sub - carriers are used to carry the data from the transmitter end to the receiver end. This paper presents analysis of “effects of high power amplifier (HPA) and channel noise in an Orthogonal Frequency Division Multiplexing (OFDM) system when the signal is passed through a nonlinear high power amplifier (HPA) which will add random complex noise to the signal when the power level exceeds the average value (here it is 0.4), otherwise it will add nothing. Comparisons between the OFDM signal with and without HPA and channel noise are also taken into account to verify the accuracy of our analysis.