Recommendation itu-r f. 1101 Characteristics of digital fixed wireless systems below about 17 ghz

(Question ITU-R 135/9)

(1994)
The ITU Radiocommunication Assembly,

considering

a) that it is preferable to define certain aspects of the characteristics of digital fixed wireless systems (DFWS) operating below about 17 GHz in order to facilitate system design;

b) that digital fixed wireless system characteristics are determined by the gross bit rate, modulation method, spectrum shaping, interference susceptibility and other relevant factors;

c) that adaptive techniques offer effective countermeasures to adverse propagation conditions and a means of reducing interference in certain circumstances. These techniques are particularly suitable for large bandwidth systems and for systems using complex modulation schemes;

d) that multi-state modulation is an effective method for increasing spectrum utilization efficiency;

e) that when spectrum efficiency is not a major issue, more simple modulation schemes (up to four states) are also suitable for low and medium capacity systems,

NOTE 1 – The material contained in this Recommendation is for guidance only. DFWS are not required to have all the features listed herein but can make use of one or several of them, depending on the application for which they are designed.

ANNEX 1

Factors to be considered in the design of digital systems
operating below 17 GHz