Nonlinear Blind Narrowband Interference Mitigation for Energy Detection Based UWB Receivers

Abstract

In this paper, a blind narrowband interference (NBI) mitigation technique using the combination of a square law (SL) device and a band pass filter (BPF) is proposed for energy detection (ED) based ultra-wideband (UWB) receivers. Both theoretical analysis and computer simulations show that without requiring any prior knowledge about the NBI, the SL technique can considerably improve signal-to-interference ratio of the received UWB pulses and hence allows ED-based UWB receivers achieve much better bit error rate. Furthermore, the proposed SL technique has the same NBI mitigation performance as the Teager-Kaiser operator (TKO) technique. Unlike TKO, there are many commercial off-the-shelf SL devices are available for IR-UWB applications. Thus, the proposed SL technique is a simple, implementable, and highly effective blind NBI mitigation technique for ED-based IR-UWB receivers.Index Terms-Ultra-wideband, energy detection, narrowband interference, Teager-Kaiser operator, square law device.

Improved Detection Schemes for Non-coherent Pulse-Position Modulation

“…Estimating such a high number of MPCs makes the receiver implementation infeasible [ 16 ]. To exploit multipath diversity with low complexity and collect more energy from MPCs, several non-coherent IR-UWB receivers have been proposed [ 17 – 21 ].…”

“…Among the non-coherent IR-UWB receivers, the energy detection (ED) pulse position modulation (PPM) receivers are promising for applications demanding low-power consumption and low complexity [ 20 , 21 ], such as IoT and robotics. However, the squaring operation in the ED-based receivers makes them vulnerable to noise plus interference and decreases their performance compared with the coherent receivers [ 20 ].…”

“…Conventional ED-PPM receivers are widely used in the literature [ 20 , 21 , 24 – 30 ]. An improved pulse position modulation, known as multipulse PPM, is proposed in [ 31 ] to achieve a higher bit rate and bandwidth efficiency for PPM communication systems.…”

“…Note that using the envelope for detection simplifies the receiver design at the expense of a severe performance loss. To reduce narrowband interference in ED-PPM receivers, [ 20 ] proposes the Teager-Kaiser operator, while [ 21 ] proposes a nonlinear blind technique with much lower complexity and almost the same performance. In [ 36 ], compressed sensing is employed for ED-PPM using the sparsity of the UWB channels at the expense of an increase in receiver complexity.…”

Noise-based transmit reference modulation : a feasibility analysis

“…Considering bursty transmissions, implementing post-cancellation techniques entails hefty overheads in term of complexity, synchronization and energy consumption; and as such, it is not suitable for the N-FOM system. Blind interference mitigation schemes, which do not require prior knowledge of the interferer or a DSP unit have also attracted research interest [87,88]. These techniques are based on idea of moving the NBI self-mixing product to a specific intermediate frequency (IF), followed by rejection filters.…”