FPGA based spectrum sensors with switchable RBW
Currently, low cost spectrum devices are required in order to monitor the overall frequency bands for CR (Cognitive Radio) systems and EMF (Electromagnetic Field) strength measurement. This study was conducted to develop an FPGA (Field Programmable Gate Array) based spectrum sensor adopting switchable RBW (Resolution Bandwidth) with resolutions of 1MHz and 100 kHz. In order to reduce the hardware complexity of the spectrum sensor, a shared multi stage FIR filter architecture was utilized, which resulted in nearly a 90% cost reduction compared to those without the proposed architecture.
IEICE Electron. Express