Research On Synchronization Technology In High-Capacity Millimeter-Wave Communication

With the rapid evolution of wireless communication networks and mobile Internet,the transmission rate is also increasing.However,the problem that spectrum resources are tight in low-frequency constraints the development of transmission capacity in communication system.Millimeter-wave communication have rich spectrum resources,excellent transmission quality and strong anti-interference ability,which is a good way to realize 10Gbps or even higher transmission rate.However,due to the particularity of the working band,the millimeter-wave signal will have a large loss in the propagation process,and this problem will seriously affect the propagation range of millimeter-wave signals.The problem of peak-to-average ratio brought about by high-order modulation also restricts the distance of millimeter-wave communication.In high-capacity millimeter wave communication system,the SC-FDE technology is used to overcome the problem of high PAPR,which can also reduce the complexity of the equalization algorithm.The working frequency and signal bandwidth of millimeter wave communication systems are different from those of low frequency band communication systems.Therefore,the application of traditional signal processing algorithms in high-capacity millimeter wave communication systems has a certain research value.So a frame synchronization algorithm and a carrier synchronization algorithm scheme for high-capacity millimeter wave communication system are designed in this paper.First of all,through the study of the propagation characteristics of millimeter wave and the application scenario of millimeter wave communication,combined with the performance requirements of high-capacity millimeter wave communication,the scheme of high-capacity millimeter wave communication system is designed.Secondly,traditional algorithm brings difficulty for hardware unit to realize frame synchronization in real time,so this paper puts forward a low-complexity time-frequency union frame synchronization scheme.This scheme reduces the complexity of frame synchronization algorithm by combining the method of coarse frame synchronization in time domain and fine frame synchronization in frequency domain.Under the premise that the performance of Meng algorithm is similar,the complexity of the algorithm is greatly reduced.In the third place,aiming at the problem that the estimation accuracy and estimation range are difficult to obtain at the same time,a low-complexity joint carrier synchronization scheme is designed in this paper.This scheme realizes the accurate estimation of large-scale frequency offset by simplifying the L&W algorithm in the single carrier system and combining it with the Moose algorithm in the OFDM system.The scheme designed in this paper combines the higher estimation accuracy of the Moose algorithm and the larger frequency offset estimation range of the L&W algorithm,and can accurately achieve carrier synchronization with a lower algorithm complexity.Finally,this paper also designed the hardware implementation of frame synchronization scheme and carrier synchronization scheme,the correctness of the algorithm is also verified through simulation software.The feasibility of the synchronization module is verified on the E-band wireless communication baseband processing unit.