ABSTRACT
This chapter focuses on radio frequency distortion mechanisms and analysis and types of Distortion such as linear Distortion and nonlinear Distortion. Sources of signal corruption, such as signal attenuation, amplitude distortion, phase distortion, multipath effects and time-varying channel characteristics, constitute the linear time-variant channel impulse response. The nonlinear distortion causes spreading in the frequency domain. Linear distortion can be introduced by the channel, nonideal filters and other subcircuits. In general, linear distortion results in time-variant amplitude and phase errors in the angle modulated wave. Nonlinear distortion usually results from channel or power amplifier nonlinearities. Amplitude nonlinearities result in undesirable amplitude modulation, whereas phase nonlinearities result in phase distortion of the angle modulated wave. The chapter also explains the classification of Wireless Radio Frequency Channels by Frequency Bands, Typical Uses, and Wave Propagation Modes. It discusses the effect of undesirable amplitude modulation resulting from linear and nonlinear distortion.
