The aim of this study is to devise detection processes for digital modems operating at
rates of 9600 bit/s and more over telephone lines, using coded QAM signals. The
baseband representation of QAM systems and the signal distortion introduced by the
telephone circuits are first investigated to derive a suitable model for the simulation
of data transmission systems, using a digital computer. [Continues.]
A doctoral thesis submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.