The Combination Of Broad And Narrow Band Based On FBMC Communication Systems

Twenty-first Century is the golden age of the rapid development of science and technology.The consequent large amount of data traffic has put forward higher requirements for mobile communication technology.As a result,with the fourth generation mobile communications(4G)commercially,next generation mobile communications(5G)and its key technologies are developed to provide faster rate of communication and more efficient spectrum utilization.Moreover,the combination of wide and narrow band is necessary.Although great advantages have been achieved by OFDM scheme in resisting multipath effect and realizing high data rate transmission in wireless channel.There are still many shortcomings in OFDM systems.Therefore,novel multi-carrier schemes are fundermantal.In this paper,some proposed shemes in FBMC and UFMC systems are provided and the coexistence of the multi-carrier scheme in the combination of wide and narrow band are studied.Firstly,from the aspects of technology and principle,FBMC,UFMC and the combination of wide and narrow band schemes are demonstrated.The basic principle and the main frame structure of FBMC scheme are introduced.In another hand,the basic principle of UFMC scheme is given and the typical frame structure is also covered.Then,the main scheme of combination of narrow and wide band is elaborated,and typical application scenarios are given in this paper.Secondly,based on the fast convolution FBMC scheme and the traditional UFMC scheme,two improved schemes are proposed respectively.For the improvement of fast convolution FBMC scheme,the basic scheme of fast convolution and the filter structure of the fast convolution FBMC system are demostrated in this paper,and the filter design is optimized base on this structure.In the optimization design of UFMC scheme,the optimization of the transceiver structure and the filter optimization scheme are proposed.Based on these two schemes,the computational complexity are reduced.With the improvement in the flexibility of the multicarrier scheme,the spectrum characteristic are improved.Finally,the coexistence performance of multicarrier scheme in the wide-and-narrow band combination communication system is studied.In this paper,the design of the system model of the wide-and-narrow band combination is demonstrated and some schemes in combination are proposed.Then the interference of multicarrier scheme in the coexisting system is anaylized.The interference cancellation of peak to average ratio suppression is studied,and a peak to average ratio suppression scheme based on windowed clipping is presented.It is proved that the interference from multicarrier system is reduced by peak to mean ratio suppression.The out-of-band emission of the multicarrier system is reduced by the peak to average ratio suppression scheme based on windowed clipping.Futhermore,the performance of the combination wide and narrow band is improved by the proposed scheme.