Influence of nonlinear HPA on trellis-Coded OFDM for terrestrial broadcasting of digital HDTV

摘要

The paper investigates a system proposal for transmitting digital high-definition television (HDTV) signals over terrestrial UHF channels. The authors compare uncoded 16-QAM and trellis-coded 32-CROSS modulation in conjunction with an orthogonal frequency division multiplexing (OFDM) procedure. The simulations show the influence of the nonlinear distortions introduced by the high-power amplifier (HPA) of the transmitter. As HPA the authors consider a travelling wave tube amplifier (TWTA) and a solid state power amplifier (SSPA). The characteristics of the channel for HDTV in a single frequency network (SFN) is simulated using a time-invariant multipath model.