The COST259 Directional Channel Model-Part I: Overview and Methodology

Abstract

Abstract-This paper describes a model for mobile radio channels that includes consideration of directions of arrival and is thus suitable for simulations of the performance of wireless systems that use smart antennas. The model is specified for 13 different types of environments, covering macro-micro-and picocells. In this paper, a hierarchy of modeling concepts is described, as well as implementation aspects that are valid for all environments. The model is based on the specification of directional channel impulse response functions, from which the impulse response functions at all antenna elements can be obtained. A layered approach, which distinguishes between external (fixed), large-scale-, and small-scale-parameters allows an efficient parameterization. Different implementation methods, based on either a tapped-delay line or a geometrical model, are described. The paper also derives the transformation between those two approaches. Finally, the concepts of clusters and visibility regions are used to account for large delay and angular spreads that have been measured. In two companion papers, the environment-specific values of the model parameters are explained and justified.Index Terms-Direction of arrival, mobile radio channel, smart antennas.

Benefits and Challenges of Deterministic Reference Channel Models

“…This consideration originates from our efforts to contribute to the RCM development within COST projects, namely parameterization for COST 259 and COST 273 models [1][2][3]. In spite of these models being quite well defined, specific and detailed, there is a permeating lack of parameter definitions.…”

“…In order to get insight into the dynamics of multipath variation, Fig. 3 shows, for each observation point along the path, calculated total power of the rays and power contributing exclu- 1 The work and/or papers where we used ray tracing tool refer to ray tracing 3D analysis tool developed by Prof. Vittorio Degli-Esposti group at the University of Bologna [8] sively to categories of observed propagation modes double diffraction mode, reflection & diffraction mode. All sums are done non-coherently.…”

“…Historically, these reference channel models would in essence look like random radio-channel generators that would generate random radio-channel characteristics, based upon some previously calculated parameters [1][2][3][4][5]. These parameters themselves were calculated from statistical analysis of available sets of measured radio-channels (data with desired geographical similarities, like sets for indoor scenario, urban scenario, suburban scenario etc.…”

“…[1,2]), all build upon a set of channel measurements or advanced numerical full wave channel simulations like ray-tracing method. The process of creating a reference channel simulation model is depicted in Fig.…”

Performance Analysis With Coordination Among Base Stations for Next Generation Communication System

“…The multipath effect will enhance or fade transmit signal to make it impossible at the receiver terminal to accurately determine the transmitted signal; it needs to use statistical description to characterize the receiving signal strength. The channel model in wireless communication is derived through analysis and simulation of channel responses and modified through empirical measurements; many channel models have been proposed [8][9][10][11][12][13][14][15][16][17][18][19]. Summarily, the received signal strength at the base station/UE can be estimated from the following equation: …”