Title page for ETD etd-050499-150855


Type of Document Master's Thesis
Author Patwari, Neal
Author's Email Address neal@vt.edu
URN etd-050499-150855
Title Measured and Modeled Time and Angle Dispersion Characteristics of the 1.8 GHz Peer-to-Peer Radio Channel
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Rappaport, Theodore S. Committee Chair
Brown, Gary S. Committee Member
Safaai-Jazi, Ahmad Committee Member
Keywords
  • peer-to-peer
  • 1.8 GHz
  • 2 GHz
  • propagation measurements
  • channel models
  • radio wave propagation
  • sliding correlator measurement system
  • angular spread
  • low antenna
  • rake receivers
  • mobile and portable radio
  • wideband
Date of Defense 1999-04-29
Availability unrestricted
Abstract
In an extensive outdoor propagation study, low antenna heights of

1.7 m are used at both the transmitter and the receiver to measure

over 3500 wideband power-delay profiles (PDPs) of the channel for

a peer-to-peer communications system. Rural and urban areas are

studied in 22 different transmitter-receiver links. The results

are used to characterize the narrowband path loss, mean delay,

root-mean-square (RMS) delay spread, and timing jitter of the

peer-to-peer wideband channel. Small-scale fading characteristics are

measured in detail by measuring and analyzing 160 PDPs within each

local area. This thesis shows the measurement setup for the

calculation of fading rate variance and angular spread and reports

the first known attempt to calculate angular spread from track

power measurements. New analysis presented in this thesis shows

the effect of measurement error in the calculation of angular

spread. The expected characteristics of angular spread are

derived using two different angle-of-arrival (AOA) models from the

literature. Measurement results show initial validation of

Durgin's angular spread theory. A new measurement-based algorithm

for simulating wideband fading processes is developed and

implemented. This simulation technique shows promise in the

simulation of high-bit rate peer-to-peer radio communication

systems.

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