Search

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Data Acquisition & Processing / Shu Ju Cai Ji Yu Chu Li is the property of Editorial Department of Journal of Nanjing University of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper proposed a secure transmission scheme using the feedback based fountain code aiming at reducing the demand of superiority on the main channel. In the binary erasure channel model, legitimate user sent feedback to transmitter, sharing the decoding situation of input symbols. Then, the encoder updated the coding process based on the feedback messages. It could expand the decoding gap and accumulate the superiority of legitimate user in decoding results. Numerical results show that the proposed method can reduce the intercepting rate of eavesdropper under the same channel conditions especially when the channel quality is close. [ABSTRACT FROM AUTHOR]

Using total transmission time-the time needed to guarantee reliable data dissemination——as judgment criterion,the payload length selection problem was investigated for three multicast solutions which are based on simple feedback retransmission,Reed-Solomon codes,and LT fountain codes,respectively,with the consideration of packet overhead.A theoretical analysis method was proposed to determine the optimal payload lengths,which was verified by simulations.Analyses and simulations indicate,for variable packet overhead sizes and link bit error rates,each method considered has its optimal payload length.As link bit error rate increases,the performance gain brought by the selection of optimal pay-load lengths becomes more significant.Among the three solutions,the reliable multicast solution based on LT fountain codes has the most outstanding performance.

In order to reduce the complexity of transmission protocols and the number of feedback links,fountain code was applied to the multi-stage parallel relay network for open-loop error control.The fountain code based network trans-mission scheme and frame format were presented.The transmission time for both the fountain code based scheme and the conventional ARQ based scheme was analyzed and compared.Results show that the total time consumed under fountain code based scheme can be significantly reduced compared to the ARQ based scheme.With the increase of relay numbers,the advantage of the fountain code based scheme is more evident.

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao is the property of Journal of Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

When half of the carriers of a frequency hopping system fails, the system will be paralyzed and unable to realize communication. The characteristics of fountain codes of rateless, low complexity and easy to implement for hardware have been widely applied. Thus, fountain codes can be applied to combat strong jamming and interferences. After in-depth analysis for fountain codes and its decoding algorithms, it is found that the transmission efficiency of fountain codes were influenced under partial band interferences i. e. the sequential and random frequency interferences were discussed. Simulations show that using high data rate LDPC precoding overhead can effectively reduce the decoding cost. Some essential conclusions about the decoding and its parameters were presented, and also some important guidances were given for the actual frequency hopping systems. [ABSTRACT FROM AUTHOR]