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TRANSMISSION CAPABILITY OF DISCRETE MULTITONE MODULATION FOR TAIWAN’S SUBSCRIBER LOOPS
Author(s) -
WEI SHYUEWIN,
LEU SHYUETZONG,
WEI CHEHO
Publication year - 1996
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/(sici)1099-1131(199601)9:1<47::aid-dac300>3.0.co;2-k
Subject(s) - asymmetric digital subscriber line , digital subscriber line , additive white gaussian noise , computer science , twisted pair , telecommunications , modulation (music) , computer network , local loop , quadrature amplitude modulation , wideband , transmission (telecommunications) , data transmission , electronic engineering , channel (broadcasting) , bit error rate , engineering , physics , acoustics
The transmission of 1.5 Mb/s and beyond data rate in the conventional twisted‐pair local loops, called asymmetrical digital subscriber line (ADSL) technology, will be possible to create a new transport access capability to provide economic wideband voice/data/video integrated services directly to residential customers. The term ‘asymmetric’ in ADSL refers to the much higher data rate in the direction from central office (CO) to the customer and the lower rate of return (control) data from the customer to the CO. Discrete multitone (DMT) modulation has been selected as the modulation scheme in ADSL. Because the crosstalk of local loops in Taiwan is 10–15 dB worse than that in the US, the service capability of DMT ADSL for Taiwan’s local loops may be different from that in other countries, and thus needs to be evaluated. On the basis of the characteristics of Taiwan’s local loops, transmission capability is estimated to be 1.544 Mb/s and 6 Mb/s in Taiwan. Simulation results also show what percentage of users in Taiwan may have 1.544 Mb/s or 6 Mb/s of ADSL services. Far‐end crosstalk (FEXT) and additive white Gaussian noise (AWGN) are considered to be the dominant noise sources in the work.