Delay Spread and Time Delay Jitter for the Uhf Factory Multipath Channel

The results of wide band delay spread and time delay jitter measurements collected from five factory buildings are presented here. Carrier frequency was 1282 MHz. The data show that excess mean delay, r.m.s. delay spread, and time delay jitter values in single-story factory buildings are similar to values observed in and around multi-story office buildings. Differential time delay jitter measurements reveal that the excess mei\n delay can ·vary as much as 180 ns for 5. 5 em shifts in receiver location. Results from 950 multipath power delay profiles collected in 50 local areas are summarized. INTRODUCTION As the factory of the future develops, there will be a need to provide flexible, por:tabie cmrununications for personnel, autonomous vehicles (mobile robots), and automated machinery. Radio is capable of providing such communications. To adequately design portable digital radio corrununicatlon systems for the factory environment, it is Imperative to first understand limitations Imposed by the channel. This paper presents results of wide band multipath power delay . profile measurements conducted in five factory buildings. Propagation characteristics of the factory channel may also be found in [ 1], [ 2]. Devasirvatham [ 3], [ 4], and Saleh and Valenzuela [ 5] have reported similar measurements around and inside office buildings. Chuang has shown that in slow fading channels for symbol durations exceeding ten times the multipath delay spread, the receiver timing recovery loop tracks the centroid (or the excess mean delay) of the multi path power delay profile [ 6] . In this paper, we report on delay spread, jitter, and differential time delay jitter measurements. Differential time delay jitter values for tho indoor racllo channd have not been previously available.