Experimental Study of the Delay Spread in an Indoor Radiating Cable System
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© 2017, Springer Science+Business Media, LLC.This paper presents the signal time dispersion in an indoor radiating cable system by using wide-band propagation measurements. The indoor environment was a university building, and the measurements were carried out in the first, second and third levels using a vector network analyzer with a frequency range of 1.25¿1.75 GHz. Two cases were studied. The results show that despite both cases having the same environment and installation, the different connections of the feeding point generate dissimilar conditions of the channel, e.g., the channel is most affected by signal delays in one case. The analysis of rms delay spread includes local and global distributions, spatial correlations, and scatter diagrams with the mean excess delay and path loss. Most of the time, the results indicate a higher concentration of power at the middle delay path, and the relationship between the rms delay spread and path loss depends mainly on the delay spread generated by the cable installation. It was found that the rms delay spread increases when the mobile antenna is near to the feeding point of the cable. Furthermore, little adjustments to the cable installation were also made and their effects on the channel are presented. Therefore, the radiating cable can provide an almost uniform coverage; however, the planning and installation of indoor radiating cable systems for high transmission rate must be carefully developed. These results allow us to understand the channel behavior for better planning and designing of radiating cable applications in indoor environments.