Abstract
Orthogonal Frequency-Division Multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. Here each sub-carrier is modulated with a conventional modulation scheme at a low symbol rate. The low symbol rate makes the use of a guard interval between symbols affordable, making it possible to eliminate intersymbol interference (ISI) and to improve signal-to-noise ratio. But the major challenging issue faced by the OFDM system is the reduction of Squared Crest Factor and Bit Error Rate. The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). The reduction algorithm for OFDM signals is presented in this project using convex optimization technique along with Tone Reservation (TR). Tone Reservation uses other unused or reserved tones to design a peak-cancelling signal that lowers the PAR of a transmit OFDM block. Similarly it lowers the bit error rate. In contrast to previous methods, the tone reservation with convex optimization implies a very quick convergence of minimum-PAR and bit error rate solution at a lower computational cost. Also the effects of oversampling at l= 1,2,4,8 on the performance of proposed OFDM system is discussed.
Published Version
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