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Research on Key Technologies in DVB-T2 and Design of Some Modules

Author: ZhangBo
Tutor: XuYouYun
School: Shanghai Jiaotong University
Course: Electronics and Communication Engineering
Keywords: DVB-T2 Constellation rotation Iterative demapping Hard decision iterative P1 symbol
CLC: TN949.197
Type: Master's thesis
Year: 2012
Downloads: 76
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Abstract

DVB-T2 standard is based on the European Telecommunications Standards Institute (ETSI) to develop a new standard for terrestrial digital TV broadcasting, the establishment of the first generation of digital terrestrial television broadcasting standard (DVB-T). This standard provides DVB-T compared to a larger selection of parameters to accommodate different channel environment, the application of a physical layer pipe (PLP), the high-order modulation and LDPC the BCH cascade error correction code, the constellation rotation pairs of transmitting antennas ( MISO), reduce the peak to average power ratio (PAPR) and interwoven and other new concepts and new technologies, improve network throughput and spectrum efficiency, and to enhance the anti-jamming capability, while also expanding the network coverage, reduce the cost of network formation and maintenance . This work consists of three parts: the introduction of a constellation rotation technique can improve the anti-interference ability of the system in a bad channel, but also increase the complexity of the receiver design. In this paper, the iterative solution based on the results of the hard decision feedback simplify mapping algorithms, computational complexity is reduced from O (m2m) to O (m), is more conducive to practical application. Compared to the soft iterative algorithm, hard decision algorithm will produce a small performance loss, specific channel, bit rate, and constellation modulation of different different, but not more than 1.9dB. P1 symbol provided in the DVB-T2, can be used to help the receiver for rapid frame synchronization. Recommended in the standard coarse timing related synchronization algorithm the timing metric function peak is relatively flat, the existence of low timing accuracy. On the basis of the analysis of the existing synchronization algorithm improved a P1 symbol synchronization algorithm, the algorithm Schmidl Cox algorithm based on a new synchronization scheme, according to the structure of the P1 symbol, to solve the original algorithm the timing metric function peak relatively flat, and can enhance the probability of correctly synchronized maximum 20%, to increase the timing accuracy of 20 to 30%, and in all SNR improved synchronization probability and timing accuracy of the synchronization algorithm to be superior to other related synchronization algorithm. The key technology research DVB-T2 also studied the structure of the system of the transmitter, the completion of the design of some of the key modules, and module design applications to FPGA implementation. Specifically includes the bit interleaving module, bit-mapped constellation module the constellation rotation, and circulatory Q delay module, frequency interleaver module and an OFDM generation module.

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