We present a novel hybrid TDMA/CDMA system for uplink transmission in multiple-access networks. This hybrid multiple-access system is based on a modulation technique related to orthogonal frequency-division multiplexing, called filtered multitone modulation (FMT). In this paper, we consider an application to uplink transmission in hybrid fiber/coax (HFC) networks. After describing the principles of FMT modulation and discussing the characteristics of the proposed system, we address the problem of initial ranging and power adjustment of unregistered stations. Finally, we introduce a new collision resolution algorithm in conjunction with FMT modulation that uses iterative identification of the competing stations to achieve high throughput on the collision channel. System performance is investigated by simulations.
By: G. Cherubini
Published in: RZ3112 in 1999
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