Asymmetric Low-power FHSS Algorithm

M.Eng. Tomáš Jakubík

Master's thesis

Abstract:

This thesis documents development and basic testing of an asymmetric FHSS network. Asymmetric in a way that the network HUB or master consumes a lot of power, while the peripherals or slaves consume as little power as possible. The basis of the network are simple GFSK transceivers CC1200 produced by TI. The intended bandwidth is an SRD band h1.1 commonly known as 868 MHz band. The controller MCUs used in this thesis are STM32F0 and STM32L0. Both are Cortex-M ARM processors produced by ST. The created network enables the connection of input only peripherals with input response time of 400 ms, while keeping the cumulative current consumption of 4.27 ěA. Peripherals receiving in periodic intervals were also discussed. The principles explored in this thesis can be used with different transceivers, different modulations or different MCUs. Some of the measurements are specific for the used hardware, but the results should be easy to extrapolate to any platform of interest. The thesis doesn?t discuss PCBs development or development of any hardware at all.

Abstract:

This thesis documents development and basic testing of an asymmetric FHSS network. Asymmetric in a way that the network HUB or master consumes a lot of power, while the peripherals or slaves consume as little power as possible. The basis of the network are simple GFSK transceivers CC1200 produced by TI. The intended bandwidth is an SRD band h1.1 commonly known as 868 MHz band. The controller MCUs used in this thesis are STM32F0 and STM32L0. Both are Cortex-M ARM processors produced by ST. The created network enables the connection of input only peripherals with input response time of 400 ms, while keeping the cumulative current consumption of 4.27 ěA. Peripherals receiving in periodic intervals were also discussed. The principles explored in this thesis can be used with different transceivers, different modulations or different MCUs. Some of the measurements are specific for the used hardware, but the results should be easy to extrapolate to any platform of interest. The thesis doesn?t discuss PCBs development or development of any hardware at all.

Keywords

Wireless, Spread Spectrum, FHSS, Low Power, STM32L0

Language used: English

Date on which the thesis was submitted / produced: 12. 8. 2016

Thesis defence

• Date of defence: 2. 2. 2017
• Supervisor: prof. Dr. Ing. Dietmar Scharf

Technical University of Liberec

Faculty of Mechatronics, Informatics and Interdisciplinary Studies

Master programme / field:
Electrical Engineering and Informatics / Mechatronics