SDR based EPC UHF RFID reader DS-SS localization testbed

This paper presents the design and evaluation of a flexible UHF RFID testbed, which is intended to be used for developing real time localization systems. It is based on an off the shelf software defined radio platform, i.e. the National Instruments USRP-2922. Special requirements for a localization algorithm based on a superimposed Direct Sequence-Spread Spectrum signal which is currently under active research have been considered for the described implementation progress and specifically for the decoder. Because some of the requirements couldn't be fulfilled using the provided manufacturer's driver framework, a custom field-programmable gate array implementation has been carried out.