Parallel Multi-carrier Modulation Technology Based On SNCK Signal

Along with the rapid development of wireless communication technology,people focus on increasing the transmission rate of the existing wireless communication system.Undoubtedly,increasing the bandwidth of signal is an important way to improve the transmission rate of information,but the current spectrum resources become precious.How to improve the bandwidth efficiency becomes a research hotspot in the field of wireless communications.Under the background of the subject "multicarrier modulation theory and the method that suitable for high speed mobile communication scenarios",parallel multicarrier modulation theory and method based on SNCK signal were studied deeply.The main contents are summarized as follows:First of all,summarize the background and significance of the topic research,present development situation of SNCK modulation technology is listed.Elaborate the wireless communication technology based on SC-SNCK,and a wireless communication system structure diagram is given.Aiming at the coherent demodulation and the FrFT demodulation receiving method,the performance of systems,including bit error rate under white Gaussian noise channel and ability to resist Doppler frequency shift are analyzed respectively.Secondly,put forward ideas of MC-SNCK modulation technology: one is constructed based on FrFT multicarrier communication system of non-coherent demodulation;the other is constructed based on the coherent demodulation i.e.OBP-SNCK system.The performance of MC – SNCK wireless communication technology are analyzed in detail,especially for OBP-SNCK communication system,such as orthogonal carrier selection,the mapping mode between binary code and carrier,time and frequency domain characteristics of the modulated signal carrier,the BER performance of communication system and the ability to resist Doppler frequency shift.Finally,MATLAB software simulation platform for SC-SNCK and MC-SNCK modulation and demodulation scheme are built.The software simulation is used to verify its feasibility,and compare the performance with current mature technology SC-FDMA which is applied in LTE uplink.Analyze the strengths and weaknesses of SNCK communication system through software simulation,objectively.Experimental results show that compared with SC-FDMA technology,SC-SNCK and MC-SNCK have the weaknesses like less numberof multicarrier,higher synchronization precise,the imperfection of the system and immaturity of the proposed technology,at the same time,they also have the superiority like lower flexible parameter setting,less complexity of system design,higher bandwidth efficiency and stronger ability to resist Doppler frequency shift.And the SNCK technology is suitable for wireless communication system under high speed mobile scenarios.