Topic
Impulse noise
About: Impulse noise is a research topic. Over the lifetime, 4816 publications have been published within this topic receiving 63970 citations.
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11 Oct 2005TL;DR: In this article, a method for reducing the effects of impulse noise in a DSL transmitter receiver device is described, which uses a periodicity associated with the impulse noise to determine data frames that are affected by the noise, and sends a reduced data rate during those frames.
Abstract: Methods and apparatuses for reducing effects of impulse noise in a DSL transmitter receiver device are described. According to certain embodiment, the method includes using a periodicity associated with the impulse noise affecting a DSL transmitter receiver device to determine data frames that are affected by the impulse noise, and sending a reduced data rate during those frames. In certain embodiments, no data is sent during those frames. The method further includes using a high margin bits and gain table, instead of a normal bits and gain table.
30 citations
10 Dec 2002
TL;DR: The channel noise factor, which is the average ambient noise above the thermal noise at the antenna input has been found to vary between 12.6 to 21.5.
Abstract: This paper presents the results of the cumulative effect of impulsive radio noise measurements conducted in an indoor environment at 900 MHz and 1800 MHz. The studies are conducted on the three floors of a multi-storey office-cum-institute building. Several sets of measurements are taken on working days, when the electric devices are in ON state and also on holidays when electric devices are in OFF state. Cumulative radio noise level due to operation of electric devices including fluorescent tubes, are found significant at different frequencies. The channel noise factor, which is the average ambient noise above the thermal noise at the antenna input has been found to vary between 12.6 to 21.5.
30 citations
TL;DR: Results show that noise pulses may have high power, long duration, and high repetition rate, so the performance of UMTS could be significantly reduced.
Abstract: Measurements of impulsive noise in the universal mobile telecommunications system (UMTS) electromagnetic environment in urban areas have been conducted and its effect on the UMTS system is analyzed. An impulsive noise-measurement system for the UMTS frequency band has been designed and built, which meets and improves the main features of classical equipments used to measure noise, offering inphase and quadrature outputs simultaneously. This measurement system was carefully calibrated before a measurement campaign was conducted in an urban environment to get impulsive noise statistics. Results show that noise pulses may have high power, long duration, and high repetition rate, so the performance of UMTS could be significantly reduced.
30 citations
28 Mar 2010
TL;DR: In this paper, a simple power loading algorithm with uniform bit allocation and non-uniform BER distribution was proposed to deal with the effect of impulsive noise in adaptive power loading in OFDM based PLC systems.
Abstract: Adaptive modulation can improve the performance of OFDM systems significantly. In Power Line Communication systems, impulsive noise has to be considered due to its severe effect in the system performance. This paper deals with the effect of impulsive noise in adaptive power loading in OFDM-based PLC systems. We present a simple power loading algorithm with uniform bit allocation and nonuniform BER distribution and test it by means of computer simulations in a widely-accepted power line channel model impaired with impulsive noise. Closed form expressions for BER and power allocation in the presence of impulsive noise are presented. Simulation results show that the proposed algorithm can achieve a considerable improvement over conventional OFDM with uniform power allocation.
30 citations
TL;DR: A median cascaded canceller is introduced as a robust multichannel adaptive array processor to significantly reduce the deleterious effects of impulsive noise spikes on convergence performance of metrics; such as (normalized) output residue power and signal to interference-plus-noise ratio (SINR).
Abstract: A median cascaded canceller (MCC) is introduced as a robust multichannel adaptive array processor. Compared with sample matrix inversion (SMI) methods, it is shown to significantly reduce the deleterious effects of impulsive noise spikes (outliers) on convergence performance of metrics; such as (normalized) output residue power and signal to interference-plus-noise ratio (SINR). For the case of no outliers, the MCC convergence performance remains commensurate with SMI methods for several practical interference scenarios. It is shown that the MCC offers natural protection against desired signal (target) cancellation when weight training data contains strong target components. In addition, results are shown for a high-fidelity, simulated, barrage jamming and nonhomogenous clutter environment. Here the MCC is used in a space-time adaptive processing (STAP) configuration for airborne radar interference mitigation. Results indicate the MCC produces a marked SINR performance improvement over SMI methods.
30 citations