An independent sharing of two 16-star QAM broadcast channels

Abstract

This paper describes an example of a system, providing two-resolution equivalent digital terrestrial broadcasting, based on UHF channel frequency arrangements. In this article orthogonal frequency division multiplexing technique combined with guard-interval is used. The transmission is achieved by using 16 QAM modulation with star constellation (16 star QAM) to reduce linearization problems of the power amplifier in the transmitter, The proposed system provides 5.5 Mbit/s to portable receivers and, additionally, 5.5 Mbit/s to fixed receivers. Block codes (BCH) give burst error correction capabilities to combat the frequency selective nature of the transmission channel.