High out-of-band (OOB) power emission has become the main shortcoming of multicarrier scheme in regard to the requirements and challenges of 5G. In this paper, two effective OOB power reduction methods, previously applied to traditional orthogonal frequency division multiplexing (OFDM) system, are proposed in hybrid carrier (HC) scheme based on weighted-type fractional Fourier transform (WFRFT). Simulation results demonstrate that, due to the flexible selection of WFRFT order in the HC system, combined bit error rate (BER) and peak-to-average power ratio (PAPR) performance advantages are gained without sidelobe impact and significant complexity increase in comparison with the OFDM scheme with spectrum precoding. In projection precoding, a smaller error vector magnitude of precoder G_χ is obtained in the proposed hybrid carrier scheme. In SVD precoding with an orthogonal decoding at the receiver, better BER performance could also be acquired at WFRFT order over the fading channels. The proposed two WFRFT-based structures are complementary, and their potential scenarios are given. In addition, applying the feature of projection precoding to channel estimation, a novel pilot structure based on WFRFT is posed to reduce the introduced error of spectrum precoding and finally helps to improve the BER performance.

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pilot structure introduced error of spectrum precoding outofband oob power emission ber performance fading sidelobe weightedtype fractional fourier transform bit error rate ber multicarrier scheme peaktoaverage power ratio channel estimation wfrft order hybrid carrier scheme in svd wfrftbased structures error vector magnitude of precoder strong classemphasistypebold gstrongsubem classemphasistypeitalic emsub orthogonal frequency division multiplexing ofdm orthogonal decoding

Xiaolu Wang,Lin Mei,Zhenduo Wang,Naitong Zhang,Xuejun Sha,.On the performance of hybrid carrier system with spectrum precoding based on WFRFT. 2017 (1),.

Xiaolu Wang, et al."On the performance of hybrid carrier system with spectrum precoding based on WFRFT" 2017

Xiaolu Wang,Lin Mei,Zhenduo Wang,Naitong Zhang,Xuejun Sha,"On the performance of hybrid carrier system with spectrum precoding based on WFRFT"