Title :
ADSL noise environment and potential system performance
Author :
Chen, Walter Y. ; Waring, David L.
Author_Institution :
Bellcore, Morristown, NJ, USA
Abstract :
In this paper the general ADSL (asymmetric digital subscriber line) noise environment is reviewed in the context of the telephone loop plant. Special attention is given to the unique unidirectional transmission nature of ADSL. A set of noise environments is presented for related computer simulation studies and hardware tests. A set of mid-CSA test loops is also proposed for performance evaluation under conditions of T1 NEXT interference. To simplify calibration procedures, noise and loop models are revealed in FIR (finite impulse response) filter form and can be measured in dB loss or dBm/Hz power density terms. A subchannel signal to noise ratio (SNR) based computer simulation method is then used to estimate potential ADSL performance under different noise environments for different serving areas
Keywords :
FIR filters; crosstalk; filtering theory; noise; performance evaluation; subscriber loops; telecommunication equipment testing; ADSL; FIR filter; T1 NEXT interference; asymmetric digital subscriber; calibration; computer simulation; finite impulse response; hardware tests; loop models; mid-CSA test loops; noise environment; noise models; performance evaluation; signal to noise ratio; system performance; telephone loop plant; unidirectional transmission; Computer simulation; DSL; Finite impulse response filter; Hardware; Interference; Signal to noise ratio; System performance; Telephony; Testing; Working environment noise;
Conference_Titel :
Communications, 1994. ICC '94, SUPERCOMM/ICC '94, Conference Record, 'Serving Humanity Through Communications.' IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-1825-0
DOI :
10.1109/ICC.1994.368863
