In what context is the DMB-T solution proposed? The gradual substitution of digital TV for analog TV is a new industry upgrade. China will have a huge digital TV consumer market, and establish China ’s own technical standards to develop digital TV businesses with independent intellectual property rights.
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Not only can it meet the growing material and cultural needs of the broad masses of the people, it can also drive the rapid development of related industries and get rid of China's embarrassing situation in the field of DVDs, digital cameras and other fields that are plagued by foreign patents.
In addition, analog TVs are gradually retiring worldwide due to problems such as snowflakes, ghosting, twills, and bright colors. And there are three terrestrial digital TV standards in Europe, the United States and Japan,
There are corresponding deficiencies and unsolvable problems in mobile reception, spectrum efficiency, single frequency network, interference, and system flexibility. For terrestrial digital TV broadcasting, first of all, a sufficiently high transmission code rate is required. Secondly, it needs to realize the simulcast with analog TV programs. More importantly, it can support mobile reception and portable reception, as well as multi-service extension functions.
After careful analysis of the development trend of digital TV technology and China's application and industrial needs, Tsinghua University
Drawing on the experience and lessons of the existing standards in the world, it integrates the latest mature technology of digital communication, in 1999
Originally proposed the DMB-T standard plan with complete independent intellectual property rights. The goal is to propose a terrestrial digital TV broadcast transmission scheme that has China's independent intellectual property rights, is functionally scalable, and meets China's terrestrial digital TV transmission requirements. Through expansion, it can achieve indoor / outdoor, fixed / multimedia information
Mobile and portable, one-way broadcast / two-way communication, etc. And in 2001, the DMB-T test system was first implemented from the origin to the end. By the end of 2002, it was basically finalized. In the various experiments and tests that were carried out subsequently, it has been fully proved that the solution is compatible with the existing analog TV transmission channel system, and has high-definition TV, standard-definition TV and multimedia data compatible transmission and single-frequency networking capabilities, supporting Mobile receiving and portable terminals;
Especially in terms of key technical performance such as fast synchronization, anti-interference ability, high spectrum utilization rate, and flexible networking,
Compared with the existing standards in Europe, the United States and Japan, it has obvious comprehensive technical advantages and application characteristics.
So far, DMB-T has met the requirements of China's terrestrial digital TV standards in terms of technical feasibility, system stability, industrialization, and operational feasibility.