Orthogonal frequency-division multiple access and its application to CATV networks

Authors
Citation
H. Sari et G. Karam, Orthogonal frequency-division multiple access and its application to CATV networks, EUR T TELEC, 9(6), 1998, pp. 507-516
Citations number
19
Categorie Soggetti
Information Tecnology & Communication Systems
Journal title
EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS
ISSN journal
1124318X → ACNP
Volume
9
Issue
6
Year of publication
1998
Pages
507 - 516
Database
ISI
SICI code
1124-318X(199811/12)9:6<507:OFMAAI>2.0.ZU;2-2
Abstract
We introduce the concept of orthogonal frequency-division multiple access ( OFDMA) and investigate its application to send upstream information from su bscriber premises to the cable head-end in cable TV (CATV) networks. The ca rrier and timing synchronizations needed to ensure orthogonality between di fferent subscriber signals are achieved by sending common pilot signals fro m the head-end. Whereas N demodulators are required to accommodate N simult aneous users in conventional FDMA systems, OFDMA only requires a single dem odulator followed by an N-point discrete Fourier transform (DFT). We analyz e the performance of this technique and compare it to time-division multipl e access (TDMA) which appears in several international standards. Our resul ts indicate that OFDMA is an attractive multiple access technique which off ers increased robustness to narrowband interference, impulse noise, and oth er signal impairments which characterize typical CATV networks.