Agilent DVB-T and DVB-T2 Transmitter Test Challenges - Application Note 5991-1923EN c20130227 [11] free download

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DVB-T and DVB-T2 Transmitter Test Challenges Application Note Introduction Over the past 10 years, DVB-T has become the most widely adopted and deployed terrestrial digital video standard. It is now well established and the prices of DVB receivers have dropped over time as the technology has matured. Due to its successful development and deployment, DVB-T has come to serve as a sort of benchmark for the development of other terrestrial digital video standards. Due to increasing scarcity of spectrum and requirements for high transmission capacity in recent years, an updated standard with more spectral efficiency is required to replace DVB-T. The DVB-T2 system is capable of meeting these requirements, due to its increased capacity, robustness, and the ability to reuse existing reception antennas. The regions which previously adopted DVB-T sys- tems, primarily countries in Europe and Asia, will be migrating to DVB-T2, while many new countries and regions began the process of adopting DVB-T2 directly since the first version of the standard was published in 2009. With the advanced technologies used in DVB-T2 to achieve high performance levels, measurement challenges face both transmitter and receiver developers. In this application note, we will focus on the transmitter test measurement challenges. Overview of the DVB-T and DVB-T2 Standards and Transmitter Structures DVB-T and DVB-T2 standards overview Both DVB-T and DVB-T2 use the OFDM modulation The combination of the parameters in Table 1 can result scheme, which provides various options for bandwidth, in numerous test cases. DVB-T2 provides more options modulation, FEC (forward error correction) rates, number of than DVB-T, enabling higher efficiency and flexibility, and carriers, and guard intervals, making it flexible enough to supports more advanced technologies, such as multiple meet the needs of different transmission environments and PLPs, LDPC coding, and MISO, resulting in increased signal operators. and test complexity, especially for a MISO configuration. Overall, while there are similarities between the two The key features of the DVB-T and DVB-T2 technologies systems, the broader set of features in the DVB-T2 system are listed side by side in Table 1. allows it to offer both a much higher data rate than DVB-T and a much more robust signal. Table 1. Comparison of the key features of the DVB-T and DVB-T2 systems Features DVB-T DVB-T2 FEC Convolutional coding + RS:1/2, 2/3, 3/4, 5/6, 7/8 LDPC + BCH: 1/2, 3/5, 2/3, 3/4, 4/5, 5/6 Modulation