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Conventionally we use discrete Fourier transform (DFT) in OFDM system. This book presents the simulation of 4 Quadrature Amplitude Modulation (QAM) orthogonal frequency division multiplexing (OFDM) baseband system and channel estimation which uses inverse discrete Hartley transform (IDHT) and discrete Hartley transform (DHT). As the calculation of DHT and IDHT involves real operations hence the computational complexities are less as compared to DFT and IDFT. Moreover as IDHT is same as DHT hence we can use same hardware for both, while the DFT and IDFT require separate hardware to implement....

Shorttitle The electromagnetic waves transmit from the transmission tower. The electric field is induced around the tower. This electric field penetrates inside the human beings. The magnitude od the incident electric field is decreased inside the body due to the absorption of energy. The tissues and cells of the human body absorbs the energy. This amount of energy is explained by the help of specific absorption rate. By the help of this specific absorption rate (SAR), the harmful frequencies of the electromagnetic waves may be declared.