Project: Ultra Wide-Band (UWB)
FSR-UWB (Frequency-Shifted Reference Ultra-WideBand) technology is being developed for RTLS (Real Time Location System) RFID applications. The project is funded by an SBIR Phase II grant sponsored by the US Army operation in RTP, NC. This technology is being developed in cooperation with NewLANs and is now ready for commercialization. More details and related publications are availabile at this link. We welcome partnership discussions.
FSR-USB meets stringent military and medical market requirements:
- Robust in the presence of interference, multipath and electromagnetic obstructions, including metal and water content
- Extremely low power - 120 mW continuous power, yielding 5 years of battery powered operation
- High accuracy – 30 cm location accuracy
- Low cost – NewLANs estimates $2.64/tag production cost
UWB-FSR based tag offers 30 cm location accuracy and 5 year battery operation
Traditional 433 MHz and 2.4 GHz technologies offer 3-10 meter resolution and falter in the presence of obstructions. Two new inventions make possible such low cost and high power efficiency: SVF (state variable filtering) and FSR.
The FSR technology solves the traditional problems of a rake receiver:
- Large number of taps required in a wide band
- Complex channel estimation
Traditional rake receiver - many taps required for a wide band
FSR implements a large number of taps inexpensively by replacing delay lines with CMOS based oscillator/mixer circuits.
The next challenge is to eliminate interference by the licensed services that may be operating inband. The unlicensed UWB transmissions are required by the FCC to stay under -41 dBm, essentially operating in the noise floor of the licensed networks. These licensed services operating at much higher levels than the desired UWB signal, can easily overdrive the FSR-UWB front end and interfere with the RFID network. The interferers in the UWB band include:
SVF technology is used to place notch filters at multiple frequencies within the UWB band to block out the interference. SVF supports the band of 500 MHz to 15 GHz. The filters can even be reconfigured in the field to notch out random unanticipated interferers and jamming signals.
Current UWB networks limit their band of operation as they don't have an effective way to combat interference. The SVF technology enables FSR-UWB to make use of almost the entire 7 GHz band.
Services licensed to operate in the UWB band. The unlicensed UWB services must operate in the noise floor of the licensed services.