Interference Analysis And Receiver Reconstruction Algorithm For UFMC System

The development of science and technology and economic progress promote the rapid development of mobile communication technology.From the introduction of 1G 40 years ago to the commercialization of 5G,mobile communication has been integrated into every aspect of life.Compared with 5G communication system,6G has a wider development coverage,shorter delay,higher transmission rate,stronger reliability and higher spectral efficiency.However,the new multi-carrier technology proposed during 5G research period is still applicable to 6G.UFMC is considered as a candidate waveform which can replace OFDM among many new multi-carrier technologies proposed.UFMC system removes the cyclic prefix on the basis of OFDM,improves the frequency utilization rate,and adds a subband filter,which has the advantages of small out-of-band leakage and high time-frequency efficiency.In order to further improve the time domain efficiency,this paper studies the insufficient transmitting signal of UFMC with carrier frequency offset,Doppler shift and phase noise.First of all,the efficiency of calculation UFMC system time domain,the signal in a truncated,for no interference situation and the existence of the ideal carrier frequency offset synchronization factors,doppler frequency shift,phase noise,and at the same time,there are three factors other than ideal synchronization UFMC system,analysis and calculation for transmitting the received signal after truncation,The Signal Interference expression and Signal to Interference plus Noise Ratio(SINR)closed form expression are derived.The effects of truncation length on Signal to Interference Ratio(SIR),SINR and Symbol Error Rate(SER)are studied under different influencing factors.Secondly,the SER performance after truncation is poor under the ideal condition is directly reconstructed,and the SER performance after truncation is poor with non-ideal synchronization factor is estimated,compensated and reconstructed using the average phase compensation reconstruction method,so as to improve SER performance and realize the optimization of time domain efficiency.The results show that in UFMC system,when there is ideal no interference and only carrier frequency offset,Doppler frequency shift and phase noise,the truncation length is short,which has little influence on SER performance,and the time-domain efficiency can be improved by directly reducing the transmitting signal length.When the truncation length is long,SER performance of the truncated signal deteriorates,so it is necessary to reconstruct and compensate the signal.After reconstruction,the influence of truncation on signal is weakened and SER performance is maintained.