Research On Wireless Communication Method And Performance Based On 3D Spatial Multi-point Focusing

The advent of the 5G era has brought more severe technical challenges to wireless communication systems,but the limited spectrum resources have greatly restricted the development of communication technologies.Therefore,from the perspective of the field,this thesis proposes a three-dimensional(3D)spatial multi-point focusing wireless communication method based on time reversal.The "space-time focusing" characteristic of electromagnetic waves based on time reversal is studied to resist multipath fading and improve the reliability of the communication system.Using the time reversal signal to carry information at the focal points formed by the grid points in the three-dimensional space enables the system to increase the number of focal points only by increasing the number of focal points while simultaneously transmitting data in parallel in a unit time slot.Make full use of airspace resources,improve the spatial spectrum reuse rate,increase the communication capacity,meet the needs of existing communication systems with multi-access equipment,high-speed,high-quality,high-spectrum utilization communication,but also for 6G and other futures Wireless communication provides new technical support.The specific research contents are as follows:Firstly,the feasibility of space-time point focusing based on time reversal in focused wireless communication is analyzed,and the advantages of time reversal in resisting multipath delay and reducing energy fading of transmission signal are verified.In view of the above characteristics,this thesis determines the research scheme of 3D spatial multi-point focus wireless communication based on time reversal.By calculating the capacity of space multi-point focus wireless communication,a new idea of increasing the capacity of communication by increasing the focus field is found.Secondly,based on the basic principle of space point focus wireless communication technology,combined with the channel characteristics of application scenarios,a space point focus wireless communication model is designed.In order to solve the problem of uneven receiving energy at the target grid and "pseudo focus" at the non target grid in the multi-point focus field,this thesis proposes a multi-point focus optimization algorithm based on singular value decomposition(SVD).By optimizing the operation,the algorithm can reduce the sidelobe interference,ensure the energy uniformity of the received signal and reduce the complexity of the signal demodulation algorithm,which greatly improves the communication rate of the system.Finally,based on the designed communication model,the electromagnetic simulation system is built to complete the signal transmission simulation of point focus wireless communication,which verifies the feasibility of increasing the communication capacity,speed and number of users by increasing the focus field.The spatial multi-point focus communication technology described in this article can effectively solve the technical problems of limited spectrum resources,low communication rate,and small system capacity,and provides strong technical support for smart factories,smart homes and other information applications.At the same time,it provides a new way to realize future-oriented mass wireless data communication,which has important research significance and practical application value.