Network Design and Field Application of ATSC Distributed Translators
ABSTRACT In this paper, a design method for a distributed translator network considering the equalization window of commercial receivers is presented and compared with the field application results with three distributed translators in an urban area of Seoul, Korea. Proper transmission timing to minimize pre-ghost can be derived from the proposed design method. With designed timing information and the measured TxID (Transmitter Identification) information, the transmission timings of translators can be adjusted. Three types of receivers with different chipset generations were used for this field test. Several combinations of translators were applied for the analysis of the effect of operating multiple translators. Field test results are analyzed and discussed for the evaluation of the target distributed translator network and its design method.
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ABSTRACT: This paper proposes a novel digital television translator which can be used for synchronized multiple transmission networks or distributed transmission networks of ATSC system. To be used in a distributed transmission network, translators should synchronize each other in terms of frequency and data. The proposed translator, named as baseband equalization distributed translator (EDTxR), uses only the received signal from the main transmitter for synchronization. EDTxR retrieves frequency and timing information from the received main transmitter signal and use it for frequency synchronization among EDTxRs. Moreover, EDTxR adopts additional frequency synchronization scheme to compensate the frequency offset of reference clock. For data synchronization, EDTxR retrieves the symbol data from the received transmitter signal and re-transmits the same symbol data, which makes all the symbols from all EDTxRs have the same data. To assess the performance of the EDTxR, laboratory test and field test are conducted and the results show EDTxR can be used as a digital television translator with higher spectrum efficiency than legacy translator.01/2011;