Orthogonal Frequency Division Multiplexing Over Multipath Fading Channels

This chapter creates the impulse response of a multipath channel and analyzes the relationship between the power-multipath magnitude profile and channel response. It then focuses on generation of orthogonal frequency division multiplexing (OFDM) signals with cyclic prefix (CP) added and demodulation of these signals in multipath fading environments. The chapter also analyzes the bit error rate (BER) performance of OFDM systems over multipath fading channels. It then provides step-by-step code exercises and instructions to implement execution sequences. The chapter subsequently focuses on OFDM systems. In order to minimize the impacts of ICI and ISI, a guard interval with a minimum length equal to the channel excess delay can be left in front of each OFDM symbol. In addition, the last portion of each OFDM symbol of the same length as the guard interval is copied and inserted in the guard interval.