A novel transmit scheme for OFDM systems with virtual subcarriers  

作　　者：陈翔 

机构地区：[1]Department of Electronic Engineering,Tsinghua University,Beijing 100084,P.R.China

出　　处：《High Technology Letters》2008年第3期232-237,共6页高技术通讯（英文版）

基　　金：the National High Technology Research and Development Program of China(No.2006AA01Z274).

摘　　要：Based on the double repetition structure in the frequency domain and the proper pulse shaping filter in the time domain, a novel transmit scheme for orthogonal frequency division multiplexing （OFDM） systems with virtual subcarriers is proposed. Our proposed scheme with comb-type pilots can provide feasibility to reduce the channel estimation errors at the band edges with conventional inverse fast Fourier transform （IFFT）-based channel estimator. Also this transmit scheme can provide additional diversity compared to the conventional OFDM scheme. Meanwhile, the receiver schemes corresponding to the proposed transmit scheme are presented to obtain the advantages mentioned above. All these efficacies are confirmed by simulations.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.

关 键 词：OFDM channel estimation comb-type pilots virtual subcarriers 

分 类 号：TN919.3[电子电信—通信与信息系统]