in this paper, a new propagation model based on utd for multiple diffraction paths in cellular mobile radio communications in urban environments is proposed. moreover, the most rigorous novel utd-based expressions for multiple diffractions by buildings and excess path losses are d - rived and analyzed. for this purpose, building rows are supposed to have rectangular cross-sections with the same...

FUTURE TRENDS OF MOBILE AND PERSONAL COMMUNICATIONS (Invited Paper) Theodore S. Rappaport Mobile & Portable Radio Research Group Bradley Department of Electrical Engineering Virginia Tech Blacksburg, VA 24061-0350 email: [email protected] This tutorial paper provides an overview of the fundamental concepts used in cellular radio communications, and illustrates the likely evolution and growth of t...

To enhance the spectral efficiency and to improve service quality for cellular radio systems, a new microcellular system has been proposed [1-5] that operate over a relatively short radio path (on the order of 200 m to 1000 m), using relatively low antennas (about the same height as lamp posts), and transmitting at relatively low power (typically on the order of 10 m W). This new concept of mic...

This contribution describes a new fast adaptive coherent receiver for the detection of Trellis-Coded-Modulated (TCM) signals transmitted over Time-Division-Multiple-Access (TDMA) based cellular mobile radio links affected by fast-fading multipaths and cochannel interference. The equalization and decoding tasks are jointly accomplished by a Symbol-by-Symbol (SbS)-MAP [8,Sect.6.6] combined equali...

We propose a new methodology and associated algorithms for computing the optimal configuration of the Multiple Fractional Guard Channel (MFGC) admission control policy in multiservice mobile wireless networks. Our approach is based on the solution space concept which discloses a novel insight into the problem of determining the optimal configuration parameter values of the MFGC policy and provi...

The global system for mobile communications, (GSM) is the most popular standard that implements second generation (2G) cellular systems. 2G systems combined with general packet radio services (GPRS) (3GPP TS 03.6, 2002) are often described as 2.5G, that is, a technology between the 2G and third generation (3G) of mobile systems. GPRS is a service that provides packet radio access for GSM users....