For the improvement of TV image quality on plasma displays (PDPs), one of the most important technologies is video signal processing. The video signal processing shows its highest performance, when both the device characteristics and the signal processing are optimized to each other. Several techniques, i.e. noise reduction, signal format conversion, edge enhancement and gradation are developed and optimized for PDP with consideration of its device characteristics. The developed video signal processing shows high image quality in terms of video SN, contrast, resolution, color and gradation of the image.
SUMMARYIn FDM and CDM systems, the peak-to-average power ratio (PAPR) increases as the number of signals to be multiplexed is increased. When a signal with a large PAPR is incident on a power amplifier, either the out-ofband radiation is increased or the power efficiency is degraded. Methods of resolving these problems are nonlinear distortion compensation techniques, one of which is the predistorter. Another conceivable solution is to suppress the PAPR of the input signal. In this paper, we first study the performance when a limiter is used for the CDM signal in the baseband. By computer simulation, it is shown that the PAPR is suppressed by using a limiter and that the deterioration of the SIR performance is small if the PAPR is more than 6 dB. Next, the characteristics are studied by numerical simulation when a CDM signal with a limiter in the baseband is input to an adaptive predistorter-type distortioncompensated power amplifier. By combining the CDM signal with a limiter in the baseband and the adaptive predistorter-type distortion-compensated power amplifier, it is possible to suppress the out-of-band radiated power and simultaneously increase the power efficiency.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.