A novel soft decision QAM demodulator for DVB-T for multipath system

In 1997, the United Kingdom started the world´s first commercial digital terrestrial television service. The system used was the European digital video broadcast - terrestrial (DVB-T) but due to technological constraints at the time, the system chosen was the 2K system - a system that uses 1705 carriers to convey the digital television services through a hostile terrestrial environment. Today, these constraints are no longer applicable but in order to maintain backwards compatibility to the older set top boxes, the 2K system is still used. The 2K system has the disadvantage of excluding the possibility of employing a single frequency network (SFN) - something that can help minimise the required bandwidth for television services. This paper will demonstrate a computationally inexpensive soft decision quadrature amplitude modulation technique that can reject the multipaths.