Receiver Iteration Reduction of an N-Continuous OFDM System with Cancellation Tones

N-continuous orthogonal frequency division multiplexing (OFDM) is a modulation technique that produces smaller sidelobes than standard OFDM as a result of continuous connections with higher-order derivatives between OFDM symbols. In this method, the transmitter inserts symbols into the signal such that inter-symbol connections are continuous through Nth-order derivatives. On the receiving side, the inserted symbols are deleted using an iterative algorithm and data symbols are demodulated. The conventional method has required numerous iterations, which is a problem due to the calculation load on the receiver. This paper therefore proposes a method by which the power of high frequency insertion symbols is canceled, and cancellation tones are used to allow a reduction in the number of receiver iterations on the receiving side. Numerical experimentation shows that by increasing transmit power by 1%, the number of receiver iterations can be reduced from 8 to 2.