低密度校驗碼及其在圖像傳輸中的應用
Low-Density Parity-Check Codes and Their Application in Image Transmission
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摘要: 低密度校驗(Low-Density Parity-Check,LDPC)碼是一種基于圖和迭代譯碼的信道編碼方案,性能非常接近Shannon極限且實現復雜度低,具有很強的糾錯抗干擾能力。該文深入研究了LDPC碼的編碼和譯碼基本原理,并將其應用于移動衰落信道圖像的傳輸中,仿真結果表明LDPC碼能為圖像傳輸帶來顯著的性能提高,且系統(tǒng)復雜度低,譯碼時延短。Abstract: Low-Density Parity-Check (LDPC) codes are a class of channel codes based on graphs and iterative decoding whose performance is very close to the Shannon limit with low complexity and have strong error control strength. In this paper, encoding and decoding principles of LDPC codes are deeply studied. At the same time, this coding scheme is applied in image transmission system over Rayieigh fading channel. The simulation results indicate that LDPC codes can make the quality of the image highly improved with rather low system complexity and short decoding time delay.
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