Abstract
Ranging with energy detectors enables low-cost implementation. However, any interference can be quite detrimental to range accuracy. We develop a method that performs nonlinear filtering on the received signal energy to mitigate multiuser interference (MUI), and we test it over time hopping and direct sequence impulse radio ultra-wideband signals. Simulations conducted over IEEE 802.15.4a residential line of sight ultrawideband multipath channels indicate that nonlinear filtering helps sustain range estimation accuracy in the presence of strong MUI.
Highlights
In time-of-arrival (ToA) based ranging, the range accuracy depends heavily on how well the ToA of a signal is estimated
We focus on simple energy detectors, and propose a multiuser interference (MUI) mitigation technique for time-hopping impulse-radio (TH-IR) [5] and direct sequence impulse radio (DS-IR) UWB systems to sustain sub-meter range accuracy when MUI is present
The DS-IR and TH-IR signals are transmitted over IEEE 802.15.4a CM1 channels
Summary
In time-of-arrival (ToA) based ranging, the range accuracy depends heavily on how well the ToA of a signal is estimated. UWB approaches based on coherent reception require many rake fingers in order to combine energy from the received signal [2]. There is a strong desire to drive down UWB radio cost This has lead to an increased interest in alternative receiver techniques for UWB that do not require the hardware complexity of coherent rake receptions. Signals from multiple devices may interfere with a desired signal and deteriorate the range error drastically. This is due to the fact that interference suppression techniques such as CDMA are not readily applicable to simple non-coherent receivers.
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