Empirical Time-Spatial Propagation Model in Outdoor NLOS Environments for Wideband Mobile Communication Systems

Abstract

In order to accurately evaluate spatial processing techniques such as Adaptive Array Antenna and MIMO techniques for wideband mobile communications, we require a time-spatial propagation model which allows the delay profile and spatial arrival angular profile characteristics of the travelling wave to be analyzed at the same time. In this paper, we propose an empirical time-spatial propagation model based on a heuristic formula estimated from field measurement data obtained in urban and suburban areas.

Empirical Time-Spatial Propagation Formula for Outdoor NLOS and LOS Environments

“…(2) corresponds to the following delay profile model for street canyon environments. (2) represents the following delay profile model in NLOS environments normalized by the first arriving path's power at distance d [1], [2], [4], [5]. In measurements, the BS antenna height h b , average building <H>, average street width W and bandwidth B were 45m, 20m, 25m and 50Mcps, respectively.…”

“…The TSP model for LOS environments proposed in this paper and the TSP model for NLOS environments proposed in previous papers [4]- [5], however, use the average building height <H> as a common parameter. That is, the proposed TSP model can easily handle various city structures simply by changing average building height <H>.…”

“…Based on field measurement data, this paper extends the TSP model for NLOS environments to also cover LOS environments [6]. Furthermore, we propose a path loss model for LOS environments.…”

“…3(b) and the other is the TSP model for NLOS environments without a direct line of sight as shown inFig. 3(c); it is realized by combining the two models[6].The TSP model for street canyon environments and the TSP model for NLOS environments are defined as ( , ) can be expressed as follows.…”

Carrier frequency characteristic of Time-Spatial profile in outdoor LOS environments

“…Delay profile [BS facing the left or right side of the street] [BS facing the end of the street]represents the following delay profile prediction formula for NLOS environments normalized by the first arriving path's power at distance d[1],[2],[4].…”