Baseband design for passive semi-UWB wireless sensor and identification systems

This paper presents a digital baseband design for passive sensor and identification systems using asymmetric wireless links with ultra wideband (UWB) radio. As opposed to traditional wireless sensor and identification systems using half-duplex communication in narrowband frequency, impulse-UWB is applied as an uplink in the proposed system. A novel baseband protocol is devised to improve the system efficiency in the multi-tag environment while maintaining the power constraint. By utilizing adaptive slotted ALOHA anti-collision algorithm, 1000 tags can be processed within 500ms. The contributions also include the development of a low-power digital baseband processor for passive tags. The simulation is successful and the FPGA prototype is operational. The chip is implemented for ASIC and it will be fabricated and tested with the front-end in 1P6M UMC 0.18μm process.