Augmented Data Transmission Based on Low Density Parity Check Code for the ATSC Terrestrial DTV System

Abstract

In this paper, we propose a novel augmented data transmission (ADT) system based on low density parity check (LDPC) code for an additional data stream transmission in the Advanced Television Systems Committee (ATSC) terrestrial digital television system. The LDPC code-based ADT system can provide additional data of rate up to 3 megabits per second (Mbps), which is significantly improved over the conventional data transmission schemes used in the transmitter identification system. Based on the laboratory test, we verify that the LDPC code-based ADT system is only about 1.1 dB away from Shannon limit.

ADT-Based UHDTV Transmission for the Existing ATSC Terrestrial DTV Broadcasting

“…The ADT system, which has been developed to increase data capacity of the existing ATSC terrestrial DTV system, was introduced in [4] and [5]. The recent implementation of ADT system can provide up to 3 Mbps additional data rate by using the following three key technologies:…”

“…In [5], the ADT system used the low-rate quasi-cyclic (QC) LDPC codes, which have a simple cascaded structure of a proper high rate code and a large number of single parity-check codes. In [12], Richardson and Urbanke presented that this cascaded construction can achieve the Shannon limit.…”

“…Fig. 2 shows the bit-error rate performance of the low-rate QC-LDPC codes with rates of 0.1864 and 0.2796 [5]. For this simulation, binary phase shift-keying (BPSK) modulation and the log-likelihood ratio (LLR) based sum-product algorithm (SPA) were used [13].…”

“…A few trials have been recently conducted to increase the data capacity for the existing ATSC terrestrial DTV system while guaranteeing backward compatibility [2]- [5]. In [2] and [3], a very low-rate data transmission scheme using the polarity of the transmitter identification (TxID) signal was developed.…”

“…However, the achievable data rate of the scheme is at most approximately a few kbps. In order to increase such a low data rate, an augmented data transmission (ADT) system was proposed and implemented in [4] and [5]. Since the ADT system uses a very low injection level and a low-rate low-density parity check (LDPC) code to avoid degrading the performance of legacy DTV receivers, the practical data rate of the ADT system is limited to up to 3 Mbps.…”