In this paper,we propose an arbitrary decode-forward single-relay scheme for finite blocklength polar codes,which can be applied to the general symmetric discrete memoryless relay channel with orthogonal receiver comp...In this paper,we propose an arbitrary decode-forward single-relay scheme for finite blocklength polar codes,which can be applied to the general symmetric discrete memoryless relay channel with orthogonal receiver components.The relay node decodes the received message.The relay node selectively re-encodes the message and transmits it to the destination node.Furthermore,in order to minimize the upper-bound of the block error probability,we propose a selection strategy to decide the proper re-encoded bit set by the relay.Simulation results are presented to illustrate the improvement in decoding performance of the proposed scheme compared to conventional relay schemes in both additive white Gaussian noise(AWGN)channel and Rayleigh fading channel(RFC).展开更多
A differential modulation scheme using space-time block codes is put forward. Compared with other schemes, our scheme has lower computational complexity and has a simpler decoder. In the case of three or four transmit...A differential modulation scheme using space-time block codes is put forward. Compared with other schemes, our scheme has lower computational complexity and has a simpler decoder. In the case of three or four transmitter antennas, our scheme has a higher rate a higher coding gain and a lower bit error rate for a given rate. Then we made simulations for space-time block codes as well as group codes in the case of two, three, four and five transmit antennas. The simulations prove that using two transmit antennas, one receive antenna and code rate of 4 bits/s/Hz, the differential STBC method outperform the differential group codes method by 4 dB. Useing three, four and five transmit antennas, one receive antenna, and code rate of 3 bits/s/Hz are adopted, the differential STBC method outperform the differential group codes method by 5 dB, 6. 5 dB and 7 dB, respectively. In other words, the differential modulation scheme based on space-time block code is better than the corresponding differential modulation scheme展开更多
球形译码(Sphere Decoding,SD)能够有效地实现极化码最大似然译码的误码性能,文章提出基于比特翻转的多重球形译码树搜索(Multiple Sphere Decoding Tree Searches Based on Bit-Flipping,BF-MSDTS)算法进一步提升短极化码的性能,该算...球形译码(Sphere Decoding,SD)能够有效地实现极化码最大似然译码的误码性能,文章提出基于比特翻转的多重球形译码树搜索(Multiple Sphere Decoding Tree Searches Based on Bit-Flipping,BF-MSDTS)算法进一步提升短极化码的性能,该算法通过扩大半径搜索和翻转不可靠比特提升误码性能,同时利用搜索终止准则和固定可靠比特降低复杂度,有效地解决了多重球形译码树搜索(Multiple Sphere Decoding Tree Searches,MSDTS)算法低信噪比下误码性能不如循环冗余校验(Cyclic Redundancy Check,CRC)辅助的串行消除列表(CRC Aided Successive Cancellation List,CA-SCL)算法的问题.仿真结果表明,在低信噪比时,当误码率为10-4时,与CA-SCL算法比较,提高了0.41dB,与MSDTS算法比较,提高了1.17dB.提出的BF-MSDTS算法的误码性能在较差的信道环境下优于现有的MSDTS算法以及CA-SCL算法.展开更多
文中研究Polar码在图像传输系统中的应用,讨论Polar码的译码迭代次数、码长、码率等因素对恢复图像的影响,并与等同条件下的低密度奇偶校验码(Low Density Parity Check Code,LDPC)在图像传输中的性能进行比较。数值仿真表明:随着Polar...文中研究Polar码在图像传输系统中的应用,讨论Polar码的译码迭代次数、码长、码率等因素对恢复图像的影响,并与等同条件下的低密度奇偶校验码(Low Density Parity Check Code,LDPC)在图像传输中的性能进行比较。数值仿真表明:随着Polar码译码迭代次数增加、码长增长和码率减小,图像传输的误块率(Block Error Rate,BER)减小,峰值信噪比(Peak Signal to Noise Ratio,PSNR)增大。同时在码长为2 048,码率为0.5时,Polar码在图像传输中的性能比LDPC码的性能有明显地提高,在输入信噪比为3 dB时,Polar码的误块率有102增强,PSNR值有4倍的提高。展开更多
基金supported in part by the National Natural Science Foundation of China under Grant 92067202,Grant 62071058.
文摘In this paper,we propose an arbitrary decode-forward single-relay scheme for finite blocklength polar codes,which can be applied to the general symmetric discrete memoryless relay channel with orthogonal receiver components.The relay node decodes the received message.The relay node selectively re-encodes the message and transmits it to the destination node.Furthermore,in order to minimize the upper-bound of the block error probability,we propose a selection strategy to decide the proper re-encoded bit set by the relay.Simulation results are presented to illustrate the improvement in decoding performance of the proposed scheme compared to conventional relay schemes in both additive white Gaussian noise(AWGN)channel and Rayleigh fading channel(RFC).
基金This project was supported by the National Natural Science Foundation of China (60172018) .
文摘A differential modulation scheme using space-time block codes is put forward. Compared with other schemes, our scheme has lower computational complexity and has a simpler decoder. In the case of three or four transmitter antennas, our scheme has a higher rate a higher coding gain and a lower bit error rate for a given rate. Then we made simulations for space-time block codes as well as group codes in the case of two, three, four and five transmit antennas. The simulations prove that using two transmit antennas, one receive antenna and code rate of 4 bits/s/Hz, the differential STBC method outperform the differential group codes method by 4 dB. Useing three, four and five transmit antennas, one receive antenna, and code rate of 3 bits/s/Hz are adopted, the differential STBC method outperform the differential group codes method by 5 dB, 6. 5 dB and 7 dB, respectively. In other words, the differential modulation scheme based on space-time block code is better than the corresponding differential modulation scheme
文摘球形译码(Sphere Decoding,SD)能够有效地实现极化码最大似然译码的误码性能,文章提出基于比特翻转的多重球形译码树搜索(Multiple Sphere Decoding Tree Searches Based on Bit-Flipping,BF-MSDTS)算法进一步提升短极化码的性能,该算法通过扩大半径搜索和翻转不可靠比特提升误码性能,同时利用搜索终止准则和固定可靠比特降低复杂度,有效地解决了多重球形译码树搜索(Multiple Sphere Decoding Tree Searches,MSDTS)算法低信噪比下误码性能不如循环冗余校验(Cyclic Redundancy Check,CRC)辅助的串行消除列表(CRC Aided Successive Cancellation List,CA-SCL)算法的问题.仿真结果表明,在低信噪比时,当误码率为10-4时,与CA-SCL算法比较,提高了0.41dB,与MSDTS算法比较,提高了1.17dB.提出的BF-MSDTS算法的误码性能在较差的信道环境下优于现有的MSDTS算法以及CA-SCL算法.
文摘文中研究Polar码在图像传输系统中的应用,讨论Polar码的译码迭代次数、码长、码率等因素对恢复图像的影响,并与等同条件下的低密度奇偶校验码(Low Density Parity Check Code,LDPC)在图像传输中的性能进行比较。数值仿真表明:随着Polar码译码迭代次数增加、码长增长和码率减小,图像传输的误块率(Block Error Rate,BER)减小,峰值信噪比(Peak Signal to Noise Ratio,PSNR)增大。同时在码长为2 048,码率为0.5时,Polar码在图像传输中的性能比LDPC码的性能有明显地提高,在输入信噪比为3 dB时,Polar码的误块率有102增强,PSNR值有4倍的提高。
