Hybrid Carrier Modulation And Interference Suppression Methods Based On GFDM

The need for 5G carrier modulation includes universal,diverse wireless communication and future communication of network services,which is diverse and varies from scenario,meaning that a single modulation mode can no longer satisfy 5G communication.It is one of the most important problems to be solved that how to explore new modulation schemes to cope with 5G more complex and varied scene modes.As one of the 5G alternative carrier waveforms,GFDM have the luxury of blending in flexible configuration,easily expanding,and adaptively adjustion,due to its flexible two-dimensional time-frequency resource configuration and nonorthogonal filter selection.Because of the similar construction of OFDM,GFDM can easily support MIMO and is compatible simultaneously with 4G and 5G,which meets the strategic deployment proposed by 3GPP for wireless development.Therefore,GFDM can be used as a new hybrid carrier modulation system.Considering that singlecarrier modulation and multi-carrier modulation have their own advantages,designing a configurable and easily scalable modulation single-carrier and multi-carrier modulation have become a development direction of the 5G carrier system.Based on the current research of multi-carrier GFDM,single-carrier modulation model for GFDM modulation is proposed by extending the time-domain lowcomplexity GFDM modulation system.By studying the commonality of modulation framework,a configurable and easily scalable hybrid GFDM modulation scheme with single carrier and multiple carrier is proposed.Under the dual selectivity of time dispersion and frequency dispersion channel,the interference suppression technology for hybrid GFDM system is studied.The impulse response model of the time-varying multipath channel is given and the inter carrier interference of GFDM system is analyzed.Two channel equalization techniques for interference suppression is proposed for GFDM.A pilot structure for fast time-varying channels for high-speed mobile scenes in 5G is designed,and a novel channel estimation method is proposed,using BEM and two-dimensional sliding Wiener filtering channel estimation scheme based on GFDM to improve the performance loss caused by inter-interference.Several classic algorithms and improved algorithms proposed in this thesis are simulated in Matlab environment.From the simulation results,the scheme can effectively suppress the frequency domain dispersion caused by high-speed mobile and reduce the interference between adjacent sub-carriers.The hybrid GFDM modulated carrier system and its interference suppression technology proposed in this thesis further improve the 5G waveform alternative scheme,not only for the mobile broadband communication scenario,but also provide an alternative for the physical layer technology of the Internet of Things and the Internet of Vehicles.