Predicting Statistical Parameters for UHF and Microwave Propagation in Cities for Advanced Spread Spectrum Design
Abstract
Our research objective is to develop efficient algorithms for predicting statistical parameters for UHF and microwave propagation in cities for advanced spread spectrum (systems). In the first year, we have studied the mechanisms contributing to angular spread at base station. We have also developed a ray formalism for modeling propagation in city streets which contain cars, trees and other scatters. In the second year's simulations of delay spread and angle spread have been carried out using the VPL ray tracing tool in rise and mixed height building environments. Range dependence and shadow fading for residential environment has been simulating for frequencies ranging from 30 MHz to 3 GHz In addition we have developed a multiple antenna systems to increase channel capacity greatly for by taking advantages of the multipath propagation characteristics. In the third year, (the) VPL code (was) used evaluation of higher order channel statistics and for the optimization of the mobile assisted hard and soft handoff algorithm parameters. The propagation parameters such as the shadowing standard deviation and the cross-correlation are shown to influence the performance of handoff algorithms. Analysis of foliage effects on RF propagation in urban environments was also performed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 23, 2001
- Accession Number
- ADA398495
Entities
People
- Henry Bertoni
- I-tai Lu