Ofdm Systems For Wireless Communications

This book is about OFDM systems, which are widely used in standards for high rate audio/video broadcasting, Wi-Fi, and WiMAX. Being a frequency domain approach to communications, OFDM has important advantages in dealing with the frequency selective nature of high data rate wireless communication channels. This monograph is intended as a tutorial which highlights deleterious aspects of wireless channels and presents several reasons why OFDM has emerged as a physical layer solution for high data rate communications. By pursuing a systems level approach, an intuitive description of the analog and discrete time representations of OFDM is provided and the advantages of implementing an OFDM system are pointed out. Further, the disadvantages of an OFDM system are mentioned with a focus on the issues of carrier frequency offset (CFO) and high peak to average power ratio (PAPR). The causes of CFO and PAPR are described along with techniques to minimize their impact on OFDM systems. To make the coverage comprehensive, a URL will be provided to access the following features: " Simple MATLAB programs are provided for simulation of discrete time OFDM systems. " Software is also provided to simulate the effects of inter-block-interference, inter-carrier-interference and signal clipping on the error rate performance. " Different components of the OFDM system are described, and detailed implementation notes are provided for the programs.