Research On GFDM Low Complexity Implementation Technology And System Performance

After decades of rapid development,mobile communication technology has become the most popular information communication.With the promotion and further research of wireless communication technology,in recent years,a variety of new multi-carrier technologies have been proposed.Generalized Frequency Division Multiplexing(GFDM)is one of them,with low out-of-band radiation,low peak-to-average power ratio,higher spectral utilization efficiency and greater parameter selectivity.Compared with the existing technology,the implementation complexity of GFDM is very high,and the high complexity implementation solution requires a lot of-additional resources to complete,which not only increases the difficulty of real engineering implementation,but also wastes unnecessary resources.Therefore,the research and design of low complexity baseband modulation algorithm and receiver demodulation algorithm are of great significance to the actual engineering implementation of GFDM.In addition,GFDM is not robust to time and frequency synchronization bias,especially in the actual channel environment,which requires synchronization algorithm and channel estimation algorithm to compensate.In view of the above series of problems,this thesis takes the next generation communication system and new multi-carrier technology as the main research background.With GFDM as the main research object,the existing GFDM implementation algorithms are studied,including FFT/IFFT-based implementation algorithms and based on The algorithm of matrix sparseization is implemented.The algorithm of signal domain implementation based on Gabor transform is analyzed.A low-complexity GFDM algorithm based on Zak transform is proposed.The correctness of the new algorithm is verified,and the complexity of several GFDM implementation algorithms is analyzed.The results show that under certain conditions,the algorithm implementation complexity of the proposed Zak transform domain is the lowest,which provides a reasonable choice for GFDM system parameters.The theoretical basis;secondly,the performance of the GFDM system is simulated and analyzed,including performance analysis of GFDM systems using different types of filters and different receiving modes,as well as carrier frequency offset(CFO)and symbol timing deviation(Symbol).The impact of Timing Offset(STO)on the performance of GFDM system;finally,the basic implementation of Zak transform-based GFDM system is realized by software-defined radio platform,and the GFDM parameter configuration of physical layer data transmission is set,which realizes the reception suitable for GFDM system.The end-synchronization algorithm and the channel estimation algorithm verify the feasibility of the low-complexity GFDM system based on Zak transform and the effectiveness of the receiver-side synchronization algorithm and channel estimation algorithm in real channel environment.