Next generation digital broadcasting should have terrestrial transmission capability to be a universal service. Next generation terrestrial digital broadcasting transmission (NGBT) requires huge transmssion rate and omnipreset coverage and should overcome the shortage of available frequency spectrum. In this dissertation, adaptive transmission and reception schemes for NGBT based on single frequency network (SFN) are proposed.
This dissertation considers regional SFN (RSFN) and nationwide SFN (NSFN) as the national network based on SFN. RSFN is composed of a number of SFN that provides different resional service by using different transmission frequencies. So, RSFN can not maximize efficiency of transmission frequency usage. Hence, transmission and reception schemes that can ensure enhancing channel capacity and the optimal performance of receiving are needed to construct RSFN. On the other hand, NSFN is comprised of a number of SFN that provides different regional service via same transmission frequency. Therefore, efficiency of transmission frequency usage is maximized in RSFN because the frequency reuse factor of RSFN is 1. However, RSFN has a problem of co-channel interference among different signals. So, RSFN needs techniques to overcome co-channel interference.
For RSFN, this dissertation proposes adaptive dual polarized antenna system to enhance channel capacity by polarization diversity. This proposed system uses a vertical polarized antenna and two horizontal polarized antennas that are orthogonal to each other, and two horizontal polarized antennas transmit same signal. Hence, a receiver of the proposed system can make two dual polarized channels and select one of two dual polarized channels having more signal power. So, the porposed system for RSFN can obtain optimal channel capacity always.
For NSFN, this dissertation proposes adaptive multiple antenna receiver to overcome co-channel interference. This proposed receiver choose a scheme based on multiple antenna depending on the transmisstion channel characteristics. So, this proposed receiver use a beam-forming scheme in the Ricean channel, and a receive diversity scheme in the Rayleigh channel. the simulation results show that the proposed adaptive multiple antenna receiver can overcome co-channel interference when it has more the number of transmission signals than reception antennas.