A novel transmit scheme for OFDM systems with virtual subcarriers

摘要

Based on the double repetition structure in the frequency domain and the proper pulse shaping falterin the time domain,a novel transmit scheme for orthogonal frequency division multiplexing(OFDM)sys-tems with virtual subcarriers is proposed.Our proposed scheme with comb-type pilots can provide feasi-bility to reduce the channel estimation errors at the band edges with conventional inverse fast Fouriertransform(IFFT)-based channel estimator.Also this transmit scheme can provide additional diversitycompared to the conventional OFDM scheme.Meanwhile,the receiver schemes corresponding to the pro-posed transmit scheme are presented to obtain the advantages mentioned above.All these efficacies areconfirmed by simulations.