Filter-Bank Based Single-carrier Transmissions

The Peak to Average Power Ratio(PAPR)problem always affects the multi-carrier communication.Using Discrete Fourier transform(DFT)to spread spectrum can make multi-carrier transmission signal have PAPR of single carrier signal.Such technologies including Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing(DFT-s-OFDM)technique based on Orthogonal Frequency Division Multiplexing(OFDM),Discrete Fourier Transform spread Filter Bank Multicarrier(DFT-s-FBMC)technique and Filter Bank spread Filter Bank Multicarrier(FB-s-FBMC)technique based on Filter Bank Multicarrier(FBMC)technique.DFT-s-FBMC is easy to implement but the improvement of PAPR is not obvious.The PAPR performance of FB-s-FBMC is much better than DFT-s-FBMC but the problem is that the implementation complexity and the system delay is too high.In allusion to the above problems,two deformation schemes based on DFT-s-FBMC are proposed in this essay.In one proposed scheme,data reconstruction module is added into DFT-s-FBMC.Reconstruct the data through specific data reconstruction method,the reconstructed data are real and imaginary interlacing after DFT,which can be the legitimate input of FBMC modulation.This essay presents a specific data reconstruction scheme and proves the correctness of the reconstruction scheme mathematically.In the another proposed scheme,the sent data symbols are firstly segmented and then preprocessing the data symbols according to the serial number,which including adding windows and DFT.After the subcarrier mapping,to the even number index data symbol segment,the even number index subcarriers transmit real part,the odd number index subcarriers transmit imaginary part;to the odd number index data symbol segment,the even number index subcarriers transmit imaginary part,odd number index subcarriers transmit real part,so as to realize the cooperation between adjacent data symbols.The simulation result shows that compared to DFT-s-FBMC,the PAPR performance of the two schemes are obviously improved;compared to FB-s-FBMC,the proposed two schemes are slightly inferior in PAPR performance but the implementation complexity is lower and do not with high delay.