ABSTRACT
This chapter provides a response to the multifaceted question on the application of time–frequency (TF): Which technique does one use and why? How does one use and implement the technique? TF methods have been introduced to provide advanced methodologies for improvement of wireless technology. TF techniques have been successfully applied in wireless communication applications to improve system performance and to meet major challenges that arise from the escalating demand for new higher data rate wireless technologies. Time varying (TV) signals are very commonly found in nature or are generated for technological use. In particular, to characterize the TV nature of the channel, especially when its spectral characteristics vary rapidly with time, one benefits from using TF methods to describe how the spectral content of a system changes with time. Time–frequency representations demonstrate how the frequency content of a signal changes with time, and are thus ideal for processing TV signals.
