Modeling and simulation of a OFDM radio link

Abstract

This paper describes how a fixed orthogonal frequency division multiplexing (OFDM) radio link operating in a frequency-selective channel has been modeled in a software simulation environment. This model will allow communications engineers to optimize OFDM radio link parameters. The following model parameters are adjustable: (1) number of bits per symbol; (2) number of symbols per OFDM block; (3) number of guard samples; (4) number of virtual carriers; (5) square root raised cosine excess bandwidth; (6) multipath amplitude, phase, and delay; (7) frequency shift; and (8) amplifier backoff. Example results showing OFDM radio link performance in a two-ray multipath channel are discussed.