Abstract
The development of society makes the demand for communication increasingly urgent,the
requirements for communication is also getting higher and higher ， Efficient channel coding
technology to improve the reliability of information transmission at the same time as much as
possible to reduce business costs, to find the channel capacity and coding complexity of the
coding method has been low channel coding technology research objectives. The polarized code
proposed by E.Arikan is an effective way to achieve this goal. It proved to be theoretically the
Shannon limit, and the codec complexity was only linear and became a powerful candidate for
the next generation 5G communication channel coding technique. In this paper, we mainly study
the coding and decoding algorithms of polarized codes, and use MATLAB to design a baseband
wireless communication system with polarization code to simulate the bit error rate of AWGN
channel. The author's main research work is summarized as follows:
1. The information of channel polarization is expounded, and the process of channel
combining and channel splitting is deduced in detail. It is proved that the importance of channel
polarization in the coding and decoding of polarization code is the theory of polarization code
2. The coding and decoding algorithms of the polarization code are systematically expounded.
In the coding study, the reliability estimation of the channel is mainly discussed. For the BEC
channel, E.Arikan proposed that the Pahos parameter can be directly calculated to estimate the
error probability, and for the general B-DMC channel and the Gaussian white noise channel, In
this paper, we propose a density evolution method and a Gaussian approximation method to
estimate the reliability of a more general channel. The information bits and the freezing bits are
effectively selected by the reliability of the subchannels, the original information vectors are
constructed, the construction method of the generating matrix is deduced, and how to construct
the polarization codes from the original information and the generation matrix. In the decoding
research, the SC decoding algorithm is mainly studied, and an improved algorithm based on SC
algorithm is proposed to solve the problem of poor coding performance under the short coding
length. The decoding process is deduced in detail.
3. Based on the MATLAB platform, the baseband wireless communication system with
polarization code is constructed. The program of polarization code coding and decoding is
completed, and the bit error rate is analyzed. The performance of SC decoding algorithm with
different code length and different bit rate is analyzed. The result shows that the longer the code
length, the smaller the code rate and the better the decoding effect. As the actual operation used
in the general short code length, can not reach the code length tends to infinite long requirements,
2星 需积分: 41 140 浏览量
2018-06-28
15:56:31
上传
评论 18
收藏 952KB PDF 举报 
布达佩斯大饭店2020-04-22没求用，不要下了
