基于NGB-W系統(tǒng)的LDPC編碼技術(shù)研究
[Abstract]:Error control coding is one of the most important techniques to ensure the reliable transmission of information in wireless communication systems. Low density parity check code (Low Density Parity Check,LDPC) is a kind of error-correcting code whose performance is infinitely close to the Shannon limit. Since the second discovery, the LDPC code has been widely concerned. Since the information theory was put forward, the LDPC code has been constructed with its low decoding complexity and flexible structure. Excellent performance has become one of the major breakthroughs in the field of coding. At present, LDPC codes are widely used in deep space communication, satellite communication, digital audio and video broadcasting and other fields. Radio and television network is the most widely used carrier of mass information dissemination. It is convenient and fast to spread information to the majority of home users. With the rapid development of information technology and the increasing demand for wireless services, radio and television network is the most widely used carrier of mass information. The traditional broadcasting network and bidirectional communication network can not optimize the mobile service, and the next generation radio and television wireless network (Next Generation Broadcast Network Wireless Systems,NGB-W) emerges as the times require. This paper is based on the project "next Generation Radio and Television Network (NGB-W)", which is attended by the Institute of New Media Wireless Technology Research Center of Shanghai Institute of Advanced Research, Chinese Academy of Sciences. In this paper, the bit-interleaved coded modulation module (Bit Interleaved Coded Modulation,BICM) is studied deeply, and the code structure of LDPC code used in channel coding is studied. In this paper, the development history and research status of LDPC codes are introduced, the basic principle of LDPC codes and some factors affecting the performance of LDPC codes are briefly introduced, and some basic decoding algorithms of LDPC codes are introduced. Then, the construction method of LDPC code is described in detail, including random construction and algebraic construction, although the code constructed by algebraic construction algorithm has a certain structure law to reduce the coding complexity. However, algebraic construction lacks flexibility in code length selection, so this paper focuses on the introduction of PEG (Progressive Edge Growth) and the improved algorithm based on the random construction algorithm. In this paper, the LDPC code in NGB-W system is constructed by using the algorithm of PEG and ACE (Approximate cycle EMD), and its performance is verified by MATLAB simulation. The performance of LDPC code in DVB-T2 is compared with that of LDPC code in DVB-T2 under the same simulation conditions. The simulation results show that the high bit rate LDPC codes constructed by PEG combined with ACE have better performance than LDPC codes in DVB-T2 systems.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN911.22
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