Image Transmission for Unequal Error Protection LDPC Coded System under PBNJ

• Main Authors: PEI-HONG JHU, 朱培宏
• Other Authors: Li-Der Jeng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/89797488741976525662

碩士 === 中原大學 === 電子工程研究所 === 105 === Frequency-hopping technique has been widely used in wireless communication systems owing to the advantages of anti-jam and multiple access, especially, in military communication system. To acquire a satisfactory capability, a FH system usually need an extra mechanism of protection by appealing to the so-called Unequal Error Protection coding (UEP). To attain the near optimum performance, a more powerful coding scheme is demanded. Therefore, we take into account the use of low density parity check code (LDPC).In this project, two types of jammer - partial-band noise jammer (PBNJ) and Additive white Gaussian noise (AWGN) are discussed. We decode the LDPC code by applying the sum-product algorithm (SPA). We employ different diversity combining schemes to compute the codeword bit decision reliability, and propose a modified detection rule to determine whether the hop is jammed or not as well as the optimum decoding metric for each received symbols. . Low-Density Parity Check codes (LDPC) become popular because of its flexibility in codeword length and better performance than those of other channel codes. This study, we propose a image transmission system which empolyed LDPC code to replace RS code under partial band noise jamming (PBNJ). Besides, we also propose Image compression and Different levels Unequal Error Protect which integrated the information after image process and channel information.