Low Power Communication And Accessing For Internet Of Things

The weak ends of Io T pursues the universal coverage of ”everything”.It is mostly oriented to ubiquitous environmental sensing and industrial control application scenarios.In practical deployments,such ends are often deployed in large numbers and on grand scales.Its design and optimization tend to be lightweight,low-cost and low-power,while still maintaining appropriate performance to meet the needs of the application.In the case of communication chip principle and architecture remain unchanged,relying only on the progress of chip integrated circuit process,communication power consumption is difficult to achieve a significant reduction.However,the bottleneck caused by communication is increasingly prominent in the current power optimization for weak ends of Io T.If the principle and architecture of communication chips remain unchanged,it is difficult to reduce the power consumption of communication by relying only on the progress of chip IC process.Considering that communication power accounts for the majority of the total power consumption of the end,if simplification or optimization of communication principles cannot be achieved,communication power will become a huge obstacle to power optimization of Io T weak ends.The research in this dissertation is the ”communication” part of the systematic research on ”low-power Io T Edge-to-End Architecture”,which focuses on the theory and key issues of low-power communication and networking for Io T ends.The main idea of our research is to introduce new principles and technologies for low-power communication,and then solve the key problems they face when used in Io T ends,so as to promote the development of these principles and technologies towards practical and universal ues.Specifically,the author conducted research on the following issues.(1)For the contradiction that existing receivers cannot balance power consumption and receiving distance,the dissertation explored low-power anti-interference,low-power signal amplification,and low-power decoding technologies for low-power non-coherent demodulation receivers.Hence,the receiver’s anti-interference performance and receiving distance are improved,while the low power consumption characteristics can be maintained.Combined with the existing low-power long-range backscatter communication technology,it can improve the communication distance between weak ends and gateways from tens of meters to hundreds of meters level.Used together with existing low-power long-range backscatter communication technologies,it is able to increase the communication distance of from tens of meters to hundreds of meters level.(2)To address the problem that the low power communication technique constraints the bandwidth and real-time communication performance of processor-less end devices,the dissertation propose a frequency division multiplexing backscatter mechanism and a link layer mechanism to realize parallel downlink control for processor-less weak ends,which solves the problem that processor-less ends cannot control frequency division baseband and frequency division channel,and cannot execute link layer parallel control commands.In large-scale networking of processor-less ends,two orders of magnitude performance improvement in bandwidth and communication real-time is achieved.(3)To address the problem of high power consumption caused by encryption backscatter communication,the dissertation propose a scheme to strip the encryption and backscatter control tasks from the processor and implement them by dedicated hardware circuits instead,which reduces the power consumption bottleneck of encryption and ciphertext transmission.(4)In the aspect of authentication protocol security,the dissertation propose a lowpower backscatter communication system which uses the spectrum-efficient step frequency modulated continuous wave(SFCW)as the carrier,and thus realize a ”distance bounding”protocol with high spectrum utilization efficiency.It can effectively defend against relay attacks by means of trusted ranging.The author hope that the research on ”communication” introduced in this dissertation can be further combined with other work such as ”de-redundant processor-less end device architecture” and ”low-power energy management” in the ”Low-power Io T Edge-to-End System” to which this paper belongs,so that the weak ends of Io T can be significantly optimized in terms of cost and power consumption.In the future,when it is combined with the ongoing research on ”long-range RF energy harvesting technology”,”generalized processor-less core chip for Io T end devices”,and ”integrated Io T‘edge-to-end’ operating system”,the author hopes that weak ends of Io T can further evolve into an ”intelligent sensing dust” with sandy volume,long life and light cost.