An Adaptive Threshold Soft-Limiting UWB Receiver with Improved Performance in Multiuser Interference

A novel receiver structure based on soft-limiting is proposed for detecting a time-hopping ultra-wide bandwidth signal in the presence of multiuser interference. The proposed structure achieves better bit error rate performance than the conventional matched receiver when operating in multiuser interference. When operating in a multiuser interference-plus-Gaussian-noise environment, the receiver structure outperforms the conventional matched filter receiver for moderate to large values of signal-to-noise ratio. A receiver structure with adaptive threshold is further proposed to ensure the performance of the soft-limiting receiver always meets or surpasses the performance of the conventional UWB receiver for all values of signal-to-noise ratio