naa a22 4500 51079159X CHVBK 20180411083321.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0810-4 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0810-4 The Fixed Links Frequency Assignment Problem with Equipment Selection [Elektronische Daten] [I. Flood, S. Allen] Microwave fixed links play a vital role supporting infrastructure requirements in telecommunications. As the demand for their use increases, particularly in providing backhaul for mobile networks, it is important that the microwave spectrum is exploited efficiently. This paper investigates the use of equipment selection algorithms within the microwave fixed-links frequency assignment problem. Standard data-rates are often supported by two alternative radio system types; one utilising a relatively lower-order modulation scheme and the other using relatively higher-order modulation. The higher-order modulation radios use less bandwidth to achieve the same data rate, but at the expense of higher wanted signal levels and lower interference thresholds. Hence while higher-order modulation is the more spectrally efficient option for an individual link considered in isolation, it may not be the most efficient when the wider network is taken into account. In this paper we provide a new model for the fixed link frequency assignment problem with equipment selection, formulated as an integer program, and investigate the nature of the trade-off between local and global spectral efficiency on a range of representative data. Springer Science+Business Media, LLC., 2012 Equipment selection nationallicence Fixed links nationallicence Frequency assignment problem nationallicence Spectral efficiency nationallicence Flood I. UK Office of Communications (Ofcom), 2a Southwark Bridge Road, SE1 9HA, London, UK aut Allen S. School of Computer Science, Cardiff University, CF24 3AA, Cardiff, UK aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 181-194 0929-6212 71:1<181 2013 71 11277 https://doi.org/10.1007/s11277-012-0810-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0810-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Flood I. UK Office of Communications (Ofcom), 2a Southwark Bridge Road, SE1 9HA, London, UK aut NATIONALLICENCE 700 1- Allen S. School of Computer Science, Cardiff University, CF24 3AA, Cardiff, UK aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 181-194 0929-6212 71:1<181 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer