Development Of A Wideband Wireless Communication System

Student: Hwee Lian Cheong

Supervisor: John Homer

Category: Engineering Thesis Project - Communications

This thesis describes the fundamental design of a wideband time domain wireless communication system, which will be used to measure multipath propagation characteristics in an environment. Preliminary testing will be done in an indoor environment. The system is capable of operating over two frequency ranges of 925MHzto 960MHz and1710MHz to 2175MHz. QPSK is the chosen modulation scheme to be implemented. With application of two uniquely architected, integrated on-chip direct conversion I/Q modulator and demodulator, switching of transmitting frequency or power adjustment is ‘made easy’ by the external graphical software programs. These devices significantly reduce the required RF know-how for design implementation. All digitized results will be sent directly to the computer for processing. A series of Digital Signal Processing (DSP) techniques are applied during this evaluation stage. The effects of antenna diversity, frequency scaling, and topography of indoor radio system will be quantified through analyses of the measured propagation data.

This concept is the first of a continuing series of projects directed towards gaining a sound understanding of the indoor radio propagation. The development and applications of new Digital Signal Processing (DSP) algorithms to compensate for the channel impairments and analogy circuitry limitation is one of these future projects.

Thesis Document (PDF)