2005 article
Threshold discrimination and blanking for large near-far power ratios in UWB networks
Lovelace, W. M., & Townsend, J. K. (2005, September). IEEE TRANSACTIONS ON COMMUNICATIONS, Vol. 53, pp. 1447–1450.
author keywords: impulse radio (IR); interference; networks; ultrawideband (UWB) radio
TL;DR:
It is found that even a small number of very near interferers can greatly reduce the performance of a system without blanking or discrimination, and a statistical model is developed that predicts bit-error performance for binary offset pulse position modulation as a function of near-far density and power for varying discrimination thresholds.
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Added: August 6, 2018
A simple chip-discrimination technique is presented for use with ultra-wideband (UWB) impulse radio (IR) that improves performance for large near-far interference power ratios. A typical spread-spectrum IR that employs a matched-filter sum for bit decisions is susceptible to small numbers of large power pulses that can dominate the bit decision-threshold statistics. This letter describes a technique for chip discrimination prior to the spreading summation, that can greatly reduce the effects of large near-far power ratios among interferers. The technique exploits the very narrow pulsewidth and resulting low-duty-cycle characteristic only achievable with ultra-wide bandwidth. A statistical model is developed that predicts bit-error performance for binary offset pulse position modulation as a function of near-far density and power for varying discrimination thresholds. An analytic solution for perfect chip blanking is developed, and is in good agreement with chip discrimination for large near-far power ratios. We find that even a small number of very near interferers can greatly reduce the performance of a system without blanking or discrimination. Results show substantial improvement using this method for near interferers with near-far power ratios greater than 20 dB.