Performance Analysis of ADSL with Punctured Convolutional Code
Wei-Zu Yang, Tomoaki Otsuki Ohtsuki, Masami Ueda, Kazuya Matsumoto, Iwao Sasase · 1999
Introduction The asymmetri dimmet subscri erliz (ADSL)i adiQ ii transport techniH1 that could provi" hi" bi rate servi2 such as fasti ternet access orviz2J9J" demand to customerspremier oversubscri erliz42 As an "asymmetriQ"'i hnimme ADSL provi" hi" rate transmi94"R vi theexiH2JJ twiJz2"R1H9 telephone lilep uniphone"zJ29k from the central o#ce (CO) to the customer. The mai advantage of ADSLi that the customer canstiH use theplai old telephone servir (POTS) togetherwie hie bi rateservi14 over only asi1QH loop (twiH22 pai22 Presently, there are two contendi2 transmiQ sia methods for ADSL:Carri9249" Ampli92 Phase (CAP) modulati"R andDi"H99J Multi9Jz (DMT) modulati"R The ADSL standard ofAmeriz' Nati -"z Standard Instid"H (ANSI) favors DMT modulatizJ DMT i aflexi24 transmiH'Q2 method,whi h caneasiH adapt for adesizJ data rateaccordi2 to the siQkQz"RH92Hk" rati (SNR) of agi en channel. In DMT ADSL, the frequency band of 30 kHz to 1.1 MHz, whi hi s used for downstream ditream" trans