GENERAL-APPROACH FOR THE COMPARISON OF SPECTRUM EFFICIENCY OF DIGITALMOBILE RADIO SYSTEMS

Evaluation of spectrum efficiency in mobile radio systems is often per formed by different authors starting from different working assumption s; that yields results that are not easily comparable outside the ''sc enario'' where they have been achieved. This paper attempts to settle this controversial matter providing some criteria for overcoming these difficulties. The results of this investigation allow to assess that relative capacity comparisons are fairly independent of some quality p arameters, such as specified outage probability, or propagation parame ters, such as the standard deviation of lognormal shadowing, so that t hese parameters need not complicate the comparison of competing approa ches. As a consequence, a very simple scenario, providing an adequate basis for deriving constant efficiency curves, turns out to be of grea t relevance for comparisons. Associated with it, a graphic tool, allow ing to perform quick relative comparisons among systems, is presented.