Propagation studies for mobile-to-mobile communications

General rights This document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: Explore Bristol Research is a digital archive and the intention is that deposited content should not be removed. However, if you believe that this version of the work breaches copyright law please contact [email protected] and include the following information in your message: • Your contact details • Bibliographic details for the item, including a URL • An outline of the nature of the complaint On receipt of your message the Open Access Team will immediately investigate your claim, make an initial judgement of the validity of the claim and, where appropriate, withdraw the item in question from public view. Ahttxcf-This paper addresses a number of key issues that affect the modelling of propagation in mobile-to-mohile communications. Current examples of such systems include Intelligent Relaying, Bluetooth and other ad-hoc solutions. The key difference in mobile-to-mobile communications is that both transmit and receive antennas are likely to he closer to the ground than those in conventional cellular networks. In addition, they may also he located in less favourahle propagation positions, such as in users' pockets, bags or desk drawers. Two measurement programmes have been performed to investigate the propagation issues relating to Intelligent Relaying in the 2GHz hand. The first campaign concerns path loss measurements in an indoor environment where the heights of the antennas are lower than those in conventional cellular networks. The second set of data was taken to determine variations in the terminal radiation pattern given the close proximity of the human hody. A number of single ray illumination measurements were performed inside an anechoic chamber. The results indicate that for the environments under consideration, an additional attenuation factor should he added to the path loss model to compensate for the unfavourable location of the terminals in a mobile-to-mobile propagation environment. This attenuation is dependent an the heights of the antennas involved, and is in the range 0-XdB.