Lpc Advantages And Disadvantages
LDPC codes belongs to the class of linear block codes, they are represented by parity check matrix H. It is a sparse matrix, it consists of very few number of non-zero elements. The sparseness of PCM determines the decoding complexity and the minimum distance of the code. LDPC matrix is described by various parameters, which are briefly described here. An encoded message is known as codeword consists of the useful information bits and redundant bits. The code rate is the ratio of length of useful information bits and length of the codeword bits. Depending upon the code rate value the redundant bits are added to the information bits. The number of non-zero elements in each row and column is known as degree of distribution. 4.1 Regular and Irregular …show more content…
Turbo codes, LDPC has the following advantages. The decoding scheme of LDPC codes is an iterative process based on sparse matrix with low computation complexity, besides the parallel structure makes it easier to be implemented on hardware. Since code rate for LDPC is easy to be adjusted, it is feasible for realizing system optimization with a flexible and self-adapted coding scheme. Compared to turbo codes LDPC performs better when it comes to high-speed data transmission or high-performance system. Low error floor is another advantage of LDPC, which makes it possible work in application with low bit error rate, such as wire communication, disk storage industry and deep communication, etc. LDPC was raised in 1960s, of which the theory and concept is clear and open to the public any troubles on intellectual property and patents, providing convenience and chances for those countries and companies which stepped late into communication fields. LDPC has the characteristics of resistance to burst error since when bits far from each other involved in the same check equation in a long symbol burst error could hardly have influence on the performance. As a result, interleaver is not necessary in the course of encoding so that the time delay by interleave is successfully
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