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Träfflista för sökning "WFRF:(Riu I.) srt2:(2005-2009)"

Sökning: WFRF:(Riu I.) > (2005-2009)

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  • Souza, Lamartine, et al. (författare)
  • Impact of Non-Stationary Noise on xDSL Systems: an Experimental Analysis
  • 2007
  • Ingår i: Proceedings of SPIE, the International Society for Optical Engineering. - : SPIE. ; 6603
  • Konferensbidrag (refereegranskat)abstract
    • Broadband services require data rates that can only be achieved by using relatively high spectrum frequencies. At such high frequencies, the DSL (Digital Subscriber Line) signal is more susceptible to external noise sources, such as radio frequency interference and impulsive noise. This paper aims to characterize how the impulsive noise impacts on services and applications for a broadband system using an ADSL2+ loop. The first approach was to use the impulsive noise defined in the standards G.996.1 (Test Procedures for DSL Transceivers) from ITU-T and TR-048 (ADSL Interoperability Test Plan) from DSL Forum. In this approach we have also used a HDSL (High Bit Rate DSL) and white noise disturbers on the line. The impulsive noises c1 and c2 (defined in G.996.1) are injected into the circuit at the CO (Central Office) end and CPE (Customer Premises Equipment) end of the loop simulator. Additionally, it was analyzed the spikes of noise's impact on the ADSL2+ line. In this case, pre-defined models of NEXT (Near-end crosstalk) and white noise are injected on CO and CPE side, simultaneously. Metrics like packet rate, lost packet count, bandwidth, short-term average transfer delay, and errored seconds are used to characterize the DSL loop under the noise impairments.
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  • Zampolo, Ronaldo de Freitas, et al. (författare)
  • Mapping The Impulse Noise Spectral Features From Waveform Domain Onto Symbol Domain
  • 2006
  • Ingår i: 6th International Telecommunications Symposium. - 9788589748049 ; , s. 193-197
  • Konferensbidrag (refereegranskat)abstract
    • In this paper the spectral features of impulse noise in DSL systems are mapped from the waveform domain onto the symbol domain, considering a QAM receiver. This work can be viewed as part of a full symbol domain model for impulse noise, which should include the amplitude and spectral aspects. Since the available models of impulse noise in DSL are generally waveform-based, this kind of mapping is justified when symbol-based simulations are intended, in order to avoid computational overhead due to demodulating noise samples generated on waveform domain. The analytical development of such mapping is provided as well as some simulation results.
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  • Resultat 11-19 av 19

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