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consider ofdm communications through the channel shown below (the power profile is 0 db at 0, 1, 3 micosec delays, and -10 db at 2 microsec delay). (a) evaluate the rms delay spread for this channel. (b) design a cyclic prefix time cpt for protecting against multipath in the channel such that the ratio useful time of ofdm symbol ut to total time of ofdm symbol ofdmt, / 0.95u ofdmt t

Sagot :

Multiple orthogonal carriers are sent out simultaneously in a transmission technology called orthogonal frequency division multiplexing (OFDM).

Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT)-based OFDM is a technique for mobile and wireless communication that has high-efficient frequency utilization, high data-rate transmission, simple and efficient implementation, and reduces inter-symbol interference (ISI) by inserting cyclic prefix (CP). Channel estimation is one of the key techniques in an OFDM system. The orthogonal frequency division multiplexing system with the Rayleigh channel module is examined for various applications in this research. The suggested method transmitted the signals using a significant number of subcarriers over 64-QAM modulation with pilot add channel estimation.

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