Information theoretic capacity of the cellular uplink - average path loss approximation

In this paper we investigate the information theoretic capacity of the uplink of a cellular system where all base station receivers jointly decode the received signals (“hyper-receiver”). Considering a distance depended power-law path loss and a more realistic Rician fading environment, we model a variable cell density network with geographically distributed user terminals. Multiple tiers of interference are considered and using an average path loss approximation model the analytical result for the per cell sum-rate capacity is found. We examine the various parameters that are affecting the capacity of the system. Especially the effect of the user distribution across the cells and the density of the cells in the cellular system is investigated. We validate the numerical solutions with Monte Carlo simulations for random fading realizations and we interpret the results for the real-world systems

Measurement and Modelling of the Propagation Channel between Low Height Terminals

The evaluation of communication systems with low-height terminals requires path loss models that are applicable to low-height links. For the terminology low-height, the range 0.5 (mobile-) to 3m (fixed-node) above ground is considered. Herein, empirical non-time-dispersive propagation models for relaying systems with low-height terminals are proposed. The models consist of line-of-sight and non-line-of-sight branches. Single- and two-slope modelling approaches were examined. The models take into account the effect of frequency, transmitter and receiver height, and environment. They are complemented by shadowing and fast-fading distribution and correlation statistics. The performance of the models in producing accurate estimations is evaluated by comparison with sets of independent data

Capacity of Cellular Uplink with Multiple Tiers of Users and Path Loss

Abstract-With the emergence and continuous growth of wireless data services, the value of a wireless network is not only defined by how many users it can support, but also by its ability to deliver higher data rates. Information theoretic capacity of cellular systems with fading is usually estimated using models originally inspired by Wyner's Gaussian Cellular Multiple Access Channel (GCMAC). In this paper we extend this model to study the cellular system with users distributed over the cellular coverage area. Based on the distance from the cellsite receiver, users are grouped as tiers, and received signals from each tier are scaled using a distance dependent attenuation factor. The optimum capacity in fading environment is then found by calculating the path-loss for users in each tier using a specific path-loss law and some interesting insights are derived. The results correspond to a more realistic model which boils down to Wyner's model with fading, with appropriate substitutions of parameter values. The results are verified using Wyner's model with fading and Monte-Carlo simulations. Insights are provided for the real world scenarios

Physical and statistical modelling of radiowave propagation

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN043465 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

A Recursive Street Canyon Model for Low Height Terminal System

Abstract-A novel recursive street canyon model is proposed for propagation in low height terminal system. This model combines a street canyon method and a recursive method together, describing the path loss of all street types (LOS, NLOS1, NLOSn) with a unified expression. Related parameters in the expression, such as recursive distance, street intersection number, street intersection orientation, street intersection separating distances, are achieved by a simplified ray tracing platform which considers only one ray along each street. Compared with present street canyon model and recursive model, this proposed model not only has a much simpler expression but also shows a higher prediction precision

Framework to Compare the Uplink Capacity of the Cellular Systems with Variable Inter Site Distance

In this paper we derive the information theoretic capacity of the uplink of a cellular system with variable inter site distance and a generalised fading environment. The capacity is shown to be a direct function of the ratio of total received signal power (from within and outside of a cell) to the AWGN noise power, at any BS. This ratio is defined as the rise over thermal (RoT). It is shown that the variation in system parameters like the path loss exponent, number of users, transmit power constraint and the inter site distance, changes the region of operation on a capacity-versus-RoT curve. Results are interpreted for practical channel models and it is shown that RoT provides a useful framework to compare various practical systems

Capacity of sectorized cellular systems: an information theoretic perspective

No abstract available