Dual thresholding for digital wideband receivers with variable truncation scheme

A novel thresholding technique is presented for digital channelized receiver to minimize second signal false alarm. The additional constraint placed for signal detection improves the false alarm rate with minimal hardware increase due to the simplicity of the proposed algorithm. Preliminary dual-tone signal analysis with instantaneous dynamic range (IDR) from -12 to -20 dB shows favorable second signal detection rates with no false alarms reported based on 53760 samples per test. The implemented digital receiver samples at 2.048 GHz on Xilinx Virtex 4 field programmable gate array (FPGA) with output throughput rate of 62.5 ns. Exhaustive evaluation of fifty-eight 16 MHz channels includes signals not centered on the frequency bin, which also shows favorable detection results.