Abstract— Current digital terrestrial television networks make
use of either single frequency networks (SFN) or multi frequency networks
(MFN). SFN is the network where several transmitters transmit the same signal
over the same frequency channel. MFN is the frequency network where each
transmitter transmits the signal over different frequency channels. Compared to
MFN,SFN is the best approach because of the efficient utilization of the Radio
spectrum, Low power operation and multi-channel capacity.
On growing market demand, need to maintain the quality, flexibility,
mobility and interactivity successfully without any overloading and overlapping
issues. For this we introduce the following two techniques. One is Hierarchical
Modulation (H-LSI) and another one is Orthogonal Frequency Division
Multiplexing (O-LSI).In order to
improve the performance of the SFN operation, DVB-NGH standard incorporates
multiple input multiple output (MIMO) antenna diversity mechanisms. In
this paper, we describe the benefits in the utilization of MIMO and its
application to DVB standards, i.e. DVB-NGH and DVB-T2 (Terrestrial 2nd
generation). Following a description of the transmission techniques adopted for
the DVB-NGH specification, we furthermore provide theoretical and physical
layer simulation results to illustrate the performance gains of MIMO in various
channel models.
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