Research On Optimization Technology Of Milimeter Wave Wireless Communication System

In the upcoming 5G wireless communication system,the demand for communication quality and transmission rate is growing,but the available spectrum resources in the microwave frequency band have not reached people's requirements.This fact prompts people to consider providing higher communication bandwidth At higher frequency bands.traditional low-frequency wireless communication technologies have been unable to provide sufficient communication services to meet people's needs for wireless transmission rates.The millimeter wave band is considered to be the most promising candidate for extremely high data rate access in future wireless networks.Academia are increasingly reaching consensus that millimeter wave will play an important role effect in 5G wireless systems.Millimeter wave has the characteristics of high frequency,short wavelength,large bandwidth,and high interaction with atmospheric components(such as oxygen)and high attenuation of most solid materials,so in daily environments,obstacles such as furniture or the human body will be blocking the millimeter-wave communication link.These obstacles will greatly attenuate the signal,and severe occlusion may even block the communication link,thereby interrupting data transmission,and the link will not be able to communicate.When obstacles appear in the direct link between the sending end and the receiving end,there are currently two commonly used solutions to alleviate this congestion: fallback and relay.The solution to the fallback is to switch to the microwave frequency band(for example,2.4 GHz)for lower rate transmission during the period when the link is blocked,and then return to the millimeter wave frequency band to continue high rate transmission after the obstacle disappears.Another solution is to set up relay nodes to forward data,so as to achieve the purpose of replacing the blocked direct link with two smooth relay links,and the smooth transmission of data from the signal source to the target node is ensured,and the overall communication quality is improved.However,for the actual situation,the transmission rate of the direct link is generally faster than that of the relay link.When the direct link becomes unblocked,the relay returns to the direct link for transmission.To do so,apparently higher throughput.But whether it can return to the directly connected link requires detection,and the detection of the millimeter wave link requires time overhead,which is related to the detection frequency and the detection beam width.Therefore,when to detect and which beam width to detect is a research problem in millimeter wave relay communication.This paper analyzes the throughput rate of the single relay millimeter wave communication system under the independent blocking model and the queuing theory blocking model,and obtains the theoretical analysis results,and proves the correctness of the theoretical analysis through simulation;The optimization problems of beam width and detection duration under the independent blocking model and the queuing theory blocking model are studied;then,an optimization scheme is proposed,and simulation results prove that the scheme can obtain a higher throughput rate than the traditional scheme.The overall performance has been improved.