The performance of high-order quadrature amplitude modulation schemes for broadband wireless communication systems

COMPUTER INFORMATION SCIENCE RICHE II. LARRY DONNELL B.S. CLARK ALTANTA UNIVERSITY, 2009 THE PERFORMANCE OF HIGH-ORDER QAUDRATURE AMPLITUDE MODULATION SCHEMES FOR BROADBAND WIRELESS COMMUNICATIONS SYSTEMS Committee Chair: Khalil A. Shujaee. Ph. D. Thesis dated July 2012 The limited amount frequency spectrum available to wireless comnmnication systems makes it difficult to satisfy the rapidly growing demand for wireless service. Spectral efficiency can be increased by using higher order modulation schemes. However this come at the cost of increased probability of error. In this paper we investigate through MATLAB simulation, the implementation of orders of Quadrature Amplitude Modulation (QAM) more commonly used in wired networks. The BER performance of 64, 128, 256, 512, 1024, 2048, 4096, and 8192 QAM signals in the presence of Rayleigh and Rician multipath channels with additive white Gaussian noise are simulated. THE PERFORMANCE OF HIGH ORDER QAM MODULATION SCHEMES FOR BROADBAND WIRELESS COMMUNICATIONS SYSTEMS A THESIS SUBMITTED TO THE FACULTY OF CLARK ATLANTA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIRMENTS FOR THE DEGREE OF MASTER OF SCIENCE