Analysis and performance evaluation studies of high bit rate digital subscriber lines (HDSL) using QAM and PAM schemes with ideal decision feedback equalization (DFE) within a carrier serving area (CSA)

QAM and PAM technologies are compared for possible HDSL application. Analysis and simulation studies with ideal decision feedback equalization (DFE) on a sample of loops within a carrier serving area (CSA) are presented. Self near-end crosstalk (NEXT) has been assumed to be the dominant source of ex...

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Bibliographic Details
Main Author: Sistanizadeh, K.
Format: Conference Proceeding
Language:English
Subjects:
Analytical models
Baseband
Bit rate
Crosstalk
Decision feedback equalizers
Filters
Frequency
Performance analysis
Quadrature amplitude modulation
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Summary:QAM and PAM technologies are compared for possible HDSL application. Analysis and simulation studies with ideal decision feedback equalization (DFE) on a sample of loops within a carrier serving area (CSA) are presented. Self near-end crosstalk (NEXT) has been assumed to be the dominant source of external impairment. Simulation studies using a 64-point symbol rectangular constellation with a transmission rate of 1.6 Mb/s (in the vicinity of DS1 rate of 1.544 Mb/s) with a carrier frequency of 153.5 kHz and 10th-order Butterworth transmit and receive filters are presented for a sample of loops extracted from Bellcore's 1983 loop survey database. It is shown that a large improvement in SNR is required to make 1.544-Mb/s 64-point QAM a viable transmission technology for HDSL application in a CSA environment. The baseband PAM with 800-kb/s and 4-level code (2B1Q) has a performance which is, on the average, 5 dB superior to that of the simulated QAM across the tested loops.< >
DOI:10.1109/GLOCOM.1990.116684