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Adaptive Thresholding for High Dual-Tone Signal Instantaneous Dynamic Range in Digital Microwave Receiver

A primary concern in the current radar-receiver design involves the critical issue of setting a threshold level that is optimal for all operating conditions. A novel adaptive thresholding technique is presented to maximize both the receiver sensitivity and the dual-tone signal instantaneous dynamic range (IDR) for digital microwave receivers. The additional constraint placed for signal detection improves the false-alarm rate with a minimal firmware increase due to the simplicity of the proposed algorithm. Using our adaptive thresholding technique, the receiver's maximum IDR varies between 34 and 24 dB below the primary signal for primary-signal strengths between -4 and -32 dBm. Our adaptive thresholding technique was realized in firmware through two receiver designs, i.e., the initial-scaling-stage (ISS) and multistage-scaling (MSS) receiver designs. Both receiver designs show significant improvement in weak-signal spurious-free dynamic range (SFDR) performance. The MSS receiver design shows a nearly 3-dB improvement in weak-signal SFDR performance. Performance evaluations show a well-coordinated effort for adaptive thresholding system integration into the existing radar-receiver system.