On Line-of-Sight Microwave Multicarrier Modulation Signature Area

Geraldo Gil R. Gomes, Renato Baldini Filho

DOI: 10.14209/its.2002.248

Evento: 2002 International Telecommunications Symposium (ITS2002)

Keywords: Digital radio Multicarrier modulation signature area selective fading

Abstract

"The availability of line-of-sight (LOS) microwave digital systems which work at high transmission rates such as 155 Mbit/s, may be strongly limited by frequency selective fading effects. The main countermeasure techniques against the fading are equalization, diversity and error control coding. Under adverse geoclimatic conditions, the path length and/or the transmission rate may suffer restrictions even when countermeasures are used. The multicarrier modulation technique may be an alternative to tackle the effects of the fading. The performance analysis of multicarrier systems can be made based on the signature area. The aim of this work is to determine the signature area of orthogonal multicarrier systems suitable for microwave digital radio, and to determine the number of carriers necessary to obtain similar or better performance than single carrier coded modulation systems with adaptive equalization. "

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