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A NEW LABELING SEARCH ALGORITHM FOR BIT-INTERLEAVED CODED MODULATION WITH ITERATIVE DECODING 认领 引用
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作者 Zou Xuelan Feng Guangzeng 《Journal of Electronics(China)》 2008年第1期59-64,共6页
Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) is a bandwidth ef- ficient transmission, where the bit error rate is reduced through the iterative information exchange between the inner demapper and... Bit-Interleaved Coded Modulation with Iterative Decoding (BICM-ID) is a bandwidth ef- ficient transmission, where the bit error rate is reduced through the iterative information exchange between the inner demapper and the outer decoder. The choice of the symbol mapping is the crucial design parameter. This paper indicates that the Harmonic Mean of the Minimum Squared Euclidean (HMMSE) distance is the best criterion for the mapping design. Based on the design criterion of the HMMSE distance, a new search algorithm to find the optimized labeling maps for BICM-ID system is proposed. Numerical results and performance comparison show that the new labeling search method has a low complexity and outperforms other labeling schemes using other design criterion in BICM-ID system, therefore it is an optimized labeling method. 展开更多
关键词 Symbol labeling Bit-Interleaved Coded Modulation （BICM） Iterative Decoding （ID） Harmonic Mean of the Minimum Squared Euclidean （HMMSE） distance
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AN ITERATIVE RELIABILITY-BASED DECODING FOR LDPC CODED MODULATION SYSTEM 认领 引用
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作者 Huang Ping Zhao Chunming Jiang Ming 《Journal of Electronics(China)》 2008年第3期289-293,共5页
In this paper, A Belief Propagation concatenated Orderd-Statistic Decoder (BP-OSD) based on accumulated Log-Likelihood Ratio (LLR) is proposed for medium and short lengths Low Density Parity-Check (LDPC) codes coded B... In this paper, A Belief Propagation concatenated Orderd-Statistic Decoder (BP-OSD) based on accumulated Log-Likelihood Ratio (LLR) is proposed for medium and short lengths Low Density Parity-Check (LDPC) codes coded Bit-Interleaved Coded Modulation (BICM) systems. The accumulated soft output values delivered by every BP iteration are used as reliability values of Soft-Input Soft-Output OSD (SISO-OSD) decoder and the soft output of SISO-OSD is used as a priori probabilities of the demodulator for the next iteration. Simulation results show that this improved algorithm achieves noticeable performance gain with only modest increase in computation complexity. 展开更多
关键词 Low-Density Parity-Check （LDPC） codes Bit-Interleaved Coded Modulation （BICM） Belief Propagation （BP） Soft-Input Soft-Output Ordered Statistics Decoding （SISO-OSD） Log- Likelihood Ratio （LLR）
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Realtime robust speech communication based on iterative joint source-channel decoding and demodulation algorithm for MELP vocoder 认领 引用
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作者 彭坦 Cui Huijuan Tang Kun 《High Technology Letters》 EI CAS 2010年第2期111-116,共6页
Realtime speech communications require high efficient compression algorithms to encode speech signals. As the compressed speech parameters are highly sensitive to transmission errors, robust source and channel decodin... Realtime speech communications require high efficient compression algorithms to encode speech signals. As the compressed speech parameters are highly sensitive to transmission errors, robust source and channel decoding and demodulation schemes are both important and of practical use. In this paper, an it- erative joint souree-channel decoding and demodulation algorithm is proposed for mixed excited linear pre- diction （MELP） vocoder by both exploiting the residual redundancy and passing soft information through- out the receiver while introducing systematic global iteration process to further enhance the performance. Being fully compatible with existing transmitter structure, the proposed algorithm does not introduce addi- tional bandwidth expansion and transmission delay. Simulations show substantial error correcting perfor- mance and synthesized speech quality improvement over conventional separate designed systems in delay and bandwidth constraint channels by using the joint source-channel decoding and demodulation （JSCCM） algorithm. 展开更多
关键词 speech coding joint souree-channel coding and modulation （JSCCM） iterative decoding
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Iterative Demodulation and Decoding Scheme with 16 QAM 认领 引用
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作者 刘林南 匡镜明 +1 位作者 李鸣 费泽松 《Journal of Beijing Institute of Technology》 EI CAS 2006年第3期311-315,共5页
Iterative demodulation and decoding scheme is analyzed and modulation labeling is considered to be one of the crucial factors to this scheme. By analyzing the existent mapping design criterion, four aspects are found ... Iterative demodulation and decoding scheme is analyzed and modulation labeling is considered to be one of the crucial factors to this scheme. By analyzing the existent mapping design criterion, four aspects are found as the key techniques for choosing a label mapping. Based on this discovery, a novel mapping design criteflon is proposed and two label mappings are searched according to it. Simulation results show that the performance of BICM-ID using the novel mappings is better than the former ones. The extrinsic information transfer （EXIT） chart is introduced and it is used to evaluate the proposed mapping design criteria. 展开更多
关键词 bit-interleaved coded modulation with iterative decoding （BICM-ID） 16 quadrature amplitude modulation （16QAM） design criteria extrinsic information
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Study on the Optimized Demodulation and Decoding of the BICM-ID system coded with LDPC 认领 引用
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《International English Education Research》 2013年第12期141-144,共4页
The demodulation and decoding solution commonly used in the bit interleaving code modulation and the LDPC coded demodulation and decoding system of the iterative decoding （BICM-ID） is to report the soft information ... The demodulation and decoding solution commonly used in the bit interleaving code modulation and the LDPC coded demodulation and decoding system of the iterative decoding （BICM-ID） is to report the soft information output from the decoder of the receiver to the demodulator as priori information for completing the decoding. However, this will give rise to the reduction of the minimum Euclidean distances between codes, so that the performances of the system decline under non-fading Gaussian channel. According to this problem, an optimized iterative demodulation decoding solution is proposed and also is analyzed using simulation. The result shows that this solution can improve the demodulation and decoding performances of LDPC coded modulation and demodulation system. 展开更多
关键词 Low-density Parity Check Code Bit Interleaving Code Modulation Iterative Demodulation and Decoding
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New Applications of EXIT Chart for Iterative Decoding Systems 认领 引用
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作者 宫丰奎 葛建华 李兵兵 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第1期35-39,共5页
Applications on iterative control and multiple input multiple output (MIMO) system were developed. Two new charts derived from extrinsic information transfer (EXIT) chart were employed as the designing tools, which ar... Applications on iterative control and multiple input multiple output (MIMO) system were developed. Two new charts derived from extrinsic information transfer (EXIT) chart were employed as the designing tools, which are called as output mutual information chart with defined iterative degree (DID) chart and near optimum output mutual information (NOMI) chart respectively. Different from the EXIT chart, they can show the iterative performance on the whole signal-to-noise ratio range with one single curve, whereas computation complexity is greatly reduced compared with conventional bit error ratio (BER) performance curve. The iterative control was implemented according to a near-optimum iterative degree vector determined by NOMI chart, the reasonability of uncertain parameters was analyzed in one MIMO system. The concepts were illustrated based on bit-interleaved coded modulation with iterative decoding (BICM-ID). 展开更多
关键词 extrinsic information transfer chart bit-interleaved coded modulation iterative decoding multiple input multiple output
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Novel Mapping Design Criterion for BICM-ID with Square QAM Constellations 认领 引用 被引量：3
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作者 刘林南 费泽松 +1 位作者 赵胜辉 匡镜明 《Journal of Beijing Institute of Technology》 EI CAS 2003年第4期385-389,共5页
Mapping design criteria of bit-interleaved coded modulation with iterative decoding (BICM-ID) with square 16QAM are analyzed. Three of the existing criteria are analyzed and compared with each other. Through the compa... Mapping design criteria of bit-interleaved coded modulation with iterative decoding (BICM-ID) with square 16QAM are analyzed. Three of the existing criteria are analyzed and compared with each other. Through the comparison, two main characters of the mapping design criteria are found. They are the harmonic mean of the minimum squared Euclidean distance and the average of Hamming distances with the nearest Euclidean distance. Based on these two characters, a novel mapping design criterion is proposed and a label mapping named mixed mapping is searched according to it. Simulation results show that mixed mapping performs better than the other mappings in BICM-ID system. 展开更多
关键词 bit-interleaved coded modulation with iterative decoding (BICM-ID) 16 quadrature amplitude modulation (16QAM) design criteria Hamming distance Euclidean distance
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A novel mapping scheme and modified decoding algorithm for BICM-ID 认领 引用
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作者 方伟伟 Li Jianping Cai Chaoshi 《High Technology Letters》 EI CAS 2013年第1期70-75,共6页
This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding(BICM-ID).The symbol mapping is composed of two QPSK with different radiuses and phases,called cross equalization-... This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding(BICM-ID).The symbol mapping is composed of two QPSK with different radiuses and phases,called cross equalization-8PSK-quasi-semi set partitioning(CE-8PSK-Quasi-SSP).Providing the same average power,the proposed scheme can increase the minimum squared Euclidean distance(MSED)and then improve the receiving performance of BICM-ID compared with conventional symbol mapping schemes.Simultaneously,a modified iteration decoding algorithm is proposed in this paper.In the process of iteration decoding,different proportion of the extrinsic information to the systematic observations results in distinct decoding performance.At high SNR(4~9dB),the observation information plays a more important role than the extrinsic information.Simulation results show that the proportion set at 1.2 is more suitable for the novel mapping in BICM-ID.When the BER is 10-4,more than 0.9dB coding gain over Rayleigh channels can be achieved for the improved mapping and decoding scheme. 展开更多
关键词 bit-interleaved coded modulation with iterative decoding （BICM-ID） minimum squared Euclidean distance （MSED） average power tioning （ CE-8PSK-Quasi-SSP） extrinsic information cross equalization-8PSK-quasi-semi set parti- priori information weighted coefficient
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A New Approximation to the Jacobian Logarithm Suitable for MAP Decoding in BICM-ID 认领 引用
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作者 Slimane Benmahmoud Ali Djebbari 《Computer Technology and Application》 2013年第5期241-244,共4页
In this paper, a new method to approximate the compensation term in the Jacobian logarithm used by the MAP decoder is proposed. Using the proposed approximation, the complex functions In（.） and exp（.） in the Exact... In this paper, a new method to approximate the compensation term in the Jacobian logarithm used by the MAP decoder is proposed. Using the proposed approximation, the complex functions In（.） and exp（.） in the Exact-log-MAP algorithm can be estimated with high accuracy and lower computational complexity. The efficacy of the proposed approximation is investigated and demonstrated by applying it to iteratively decoded BICM （Bit Interleaved Coded Modulation）. 展开更多
关键词 Log-MAP Bahl-Cocke-Jelinek-Raviv （BCJR） algorithm max function Jacobian logarithm correction （compensation）term （function） BICM-ID （Bit Interleaved Coded Modulation with Iterative Decoding）.
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适用于BICM-ID系统的星座成形方法 认领 引用 被引量：5
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作者 李琪 周林 +1 位作者 张博 白宝明 《通信学报》 EI CSCD 北大核心 2015年第6期149-156,共8页
结合几何成形与概率成形的思想,提出了一种适用于比特交织编码调制系统的星座成形映射方法。该方法基于实用信号星座,通过不使用部分能量较大的信号点并利用多对一的映射关系,使发送信号逼近最佳输入概率分布。利用解调器和译码器之间... 结合几何成形与概率成形的思想,提出了一种适用于比特交织编码调制系统的星座成形映射方法。该方法基于实用信号星座,通过不使用部分能量较大的信号点并利用多对一的映射关系,使发送信号逼近最佳输入概率分布。利用解调器和译码器之间的迭代译码,该方法可方便地获得成形增益。基于容量和外信息转移图分析,给出了信号星座和信号到符号映射的优化方法。理论分析和仿真结果表明,在高斯白噪声信道和独立Rayleigh衰落信道下,该映射方法利用大信号星座在采用迭代译码的比特交织编码调制系统中均能取得优于传统Gray映射的误码性能,且随着调制阶数的增大可进一步提高成形增益。 展开更多
关键词 比特交织编码调制 迭代译码 映射方式 成形增益 外信息转移图
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一种新的BICM-ID的8PSK星座映射 认领 引用 被引量：5
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作者 郭文彬 杨鸿文 杨大成 《北京邮电大学学报》 EI CAS 北大核心 2005年第3期20-22,共3页
基于伪随机交织器,提出了一种比特交织编码调制-迭代检测(BICM-ID)下星座映射的新规则,并设计了新的8相移相键控(8PSK)星座映射.通过分析和计算机仿真,比较了各种8PSK星座映射性能,加性高斯白噪信道下的性能仿真结果表明,根据新规则设计... 基于伪随机交织器,提出了一种比特交织编码调制-迭代检测(BICM-ID)下星座映射的新规则,并设计了新的8相移相键控(8PSK)星座映射.通过分析和计算机仿真,比较了各种8PSK星座映射性能,加性高斯白噪信道下的性能仿真结果表明,根据新规则设计的8PSK星座映射好于其他星座映射. 展开更多
关键词 比特交织编码调制-迭代检测 8相移相键控 星座映射
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基于BICM-ID系统的单通道混合信号盲恢复算法 认领 引用 被引量：4
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作者 张冬玲 张君 +1 位作者 李静 葛临东 《系统工程与电子技术》 EI CSCD 北大核心 2012年第2期379-384,共6页
针对非协作通信中单通道同频线性调制混合信号盲恢复问题,基于比特交织编码调制迭代译码(bit-interleaved code modulation iterative decoder,BICM-ID)算法思想,建立单通道混合基带接收系统模型,提出一种联合解调和译码实现单通道混合... 针对非协作通信中单通道同频线性调制混合信号盲恢复问题,基于比特交织编码调制迭代译码(bit-interleaved code modulation iterative decoder,BICM-ID)算法思想,建立单通道混合基带接收系统模型,提出一种联合解调和译码实现单通道混合信号中源信息盲恢复算法。通过分析和推导,给出一种混合信号解映射的方法。该算法不需要对混合信号分离,而可以直接从混合信号中估计出各路源信号,且复杂度低。理论分析和仿真结果表明,对于无码间干扰和有码间干扰的加性高斯白噪声(additive white Gaussin noise,AWGN),算法都能得到较低的误比特率(bit error rate,BER),而且算法对等功率混合信号和不等功率混合信号同样适用。 展开更多
关键词 盲分离 单通道 基于比特交织编码调制迭代译码 成对载波多址
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多维映射BICM-ID系统的SISO解映射算法 认领 引用 被引量：4
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作者 宫丰奎 葛建华 王勇 《西安电子科技大学学报》 EI CAS 北大核心 2007年第6期895-899,共5页
通过修改二维映射下的MAX-LOG-MAP算法的概率计算函数,得到针对多维映射比特交织编码调制迭代译码(BICM-ID)系统的软输入软输出(SISO)解映射公式.提出一种简化MD-TS(Multi-Dimensional Tree-Searching)算法,该算法结合多天线系统下的树... 通过修改二维映射下的MAX-LOG-MAP算法的概率计算函数,得到针对多维映射比特交织编码调制迭代译码(BICM-ID)系统的软输入软输出(SISO)解映射公式.提出一种简化MD-TS(Multi-Dimensional Tree-Searching)算法,该算法结合多天线系统下的树搜索算法,选择概率较大的可能发送符号矢量,而不是在整个矢量集合穷搜索,计算复杂度与选择的列表长度成正比.仿真结果表明,多维映射时,BICM-ID系统可以取得更优的渐进BER性能,且采用简化MD-TS解映射算法性能损失仅0.2 dB左右. 展开更多
关键词 比特交织编码调制迭代译码(BICM-ID) 多维映射 软输入软输出解映射 多维树搜索
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Optimized LDPC differential-encoded 16QAM scheme for high-speed transmission systems 认领 引用 被引量：1
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作者 Zhanji Wu Xiang Gao Zhiyu Xiao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第5期728-734,共7页
The 16-ary quadrature amplitude modulation （16QAM） is a high spectral efficient scheme for high-speed transmission systems. To remove the phase ambiguity in the coherent detection system, differential-encoded 16QAM ... The 16-ary quadrature amplitude modulation （16QAM） is a high spectral efficient scheme for high-speed transmission systems. To remove the phase ambiguity in the coherent detection system, differential-encoded 16QAM （DE-16QAM） is usually used, however, it will cause performance degradation about 3 dB as compared to the conventional 16QAM. To overcome the performance loss, a serial concatenated system with outer low density parity check （LDPC） codes and inner DE-16QAM is proposed. At the receiver, joint iterative differential demodulation and decoding （ID） is carried out to approach the maximum likelihood performance. Moreover, a genetic evolution algorithm based on the extrinsic information transfer chart is proposed to optimize the degree distribution of the outer LDPC codes. Both theoretical analyses and simulation results indicate that this algorithm not only compensates the performance loss, but also obtains a significant performance gain, which is up to 1 dB as compared to the conventional non-DE-16QAM. 展开更多
关键词 quadrature amplitude modulation （QAM） low density parity check （LDPC） code genetic evolution （GE） algorithm iterative demodulation and decoding （ID） extrinsic information transfer （EXIT） chart.
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多维映射BICM-ID系统的简化MD-LSD解映射算法 认领 引用 被引量：1
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作者 宫丰奎 葛建华 王勇 《通信学报》 EI 北大核心 2008年第2期111-115,共5页
将二维映射下的软输入软输出解映射MAX-LOG-MAP算法扩展到多维映射比特交织编码调制及迭代译码(BICM-ID)系统,并首次结合多天线系统下的列表球形译码,提出一种简化MD-LSD(multi-dimensional list sphere decoding)算法。新算法大幅降低... 将二维映射下的软输入软输出解映射MAX-LOG-MAP算法扩展到多维映射比特交织编码调制及迭代译码(BICM-ID)系统,并首次结合多天线系统下的列表球形译码,提出一种简化MD-LSD(multi-dimensional list sphere decoding)算法。新算法大幅降低了多维解映射的计算复杂度。仿真结果表明,列表长度满足一定范围时,采用简化MD-LSD算法解映射算法的性能损失可以忽略。 展开更多
关键词 BICM-ID 多维映射 软输入软输出解映射 多维列表球形译码
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基于BICM-ID-SSD的多用户编码协同系统性能分析 认领 引用 被引量：1
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作者 黄英 雷菁 习勇 《系统工程与电子技术》 EI CSCD 北大核心 2013年第6期1291-1296,共6页
在多用户协同模型中,将协同伙伴数目与信号空间分集中星座维数相结合,提出了一种高效的编码协同方案。采用比特交织编码调制技术,目的端通过信号空间分集和迭代译码提升系统性能。推导了衰落信道下协同传输的理论性能一致界,进行了系统... 在多用户协同模型中,将协同伙伴数目与信号空间分集中星座维数相结合,提出了一种高效的编码协同方案。采用比特交织编码调制技术,目的端通过信号空间分集和迭代译码提升系统性能。推导了衰落信道下协同传输的理论性能一致界,进行了系统性能仿真,并重点分析了信号空间分集中星座维数、协同程度及星座映射关系对系统性能的影响。理论分析及仿真结果均表明:快衰落信道下,信号空间分集会带来额外的增益;在快、慢两种衰落信道下,通过协同程度的增加及最佳映射关系的选择都可以带来系统性能的提升。 展开更多
关键词 多用户协同 协同伙伴 协同程度 信号空间分集 比特交织编码调制及其迭代译码
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非理想信噪比估计对BICM-ID系统性能的影响 认领 引用 被引量：1
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作者 聂远飞 葛建华 王勇 《电子与信息学报》 EI CAS 北大核心 2008年第3期616-620,共5页
该文给出一种直观的信噪比估计非理想时的先验信息建模,使用外信息转移图较为全面地分析了非理想信噪比估计对带迭代译码的比特交织编码调制系统性能的影响,分析结果表明非理想信噪比估计对典型的星座类型和标号在高斯和瑞利信道下的影... 该文给出一种直观的信噪比估计非理想时的先验信息建模,使用外信息转移图较为全面地分析了非理想信噪比估计对带迭代译码的比特交织编码调制系统性能的影响,分析结果表明非理想信噪比估计对典型的星座类型和标号在高斯和瑞利信道下的影响相似;通过对不同帧长的系统性能比较可知,长帧下信噪比估计偏小在-3dB以下时性能会大大下降,而估计偏大则没有影响;而对于中短帧而言,在相同的偏差下,偏小的影响要大于偏大的影响;此外,还给出由拟合得到的8PSK高斯信道和16QAM高斯与瑞利信道下的信噪比估计算法,最后通过系统仿真验证了该算法的有效性。 展开更多
关键词 带迭代译码的比特交织编码 外信息转移 信噪比估计
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一种适用于BICM-ID系统的迭代载波同步算法 认领 引用 被引量：1
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作者 赵振华 彭华 《电路与系统学报》 北大核心 2013年第2期383-389,共7页
在比特交织编码调制迭代译码(BICM-ID)系统中,针对低信噪比条件下传统的同步算法对频偏和相差估计精度较低的问题,提出了一种码辅助的迭代载波同步算法。该算法基于最大期望(EM)算法,并在此基础上加以改进,利用译码器输出的软信息,迭代... 在比特交织编码调制迭代译码(BICM-ID)系统中,针对低信噪比条件下传统的同步算法对频偏和相差估计精度较低的问题,提出了一种码辅助的迭代载波同步算法。该算法基于最大期望(EM)算法,并在此基础上加以改进,利用译码器输出的软信息,迭代的在载波同步和译码之间相互交换信息,实现同步和译码的联合处理。仿真结果表明,在译码器收敛的允许范围之内,提出的算法能够大幅提高同步参数的估计精度,在迭代次数达到8次时,BICM-ID系统的误比特率性能基本接近理想同步条件下的译码性能。 展开更多
关键词 比特交织编码调制迭代译码 EM迭代算法 载波同步 软映射
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BICM-ID光通信系统中一种新颖星座映射方案的优化分析 认领 引用 被引量：1
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作者 任利华 《半导体光电》 CAS 北大核心 2015年第3期451-454,460,共4页
针对传统Gray映射在中高信噪比区域内对迭代译码的比特交织编码调制(BICMID)光通信系统改善信道容量性能有限的问题,基于互信息准则和比特的不等保护度提出了一种新颖的16QAM星座映射方案。仿真分析表明:在中高信噪比下,所提出的新映射... 针对传统Gray映射在中高信噪比区域内对迭代译码的比特交织编码调制(BICMID)光通信系统改善信道容量性能有限的问题,基于互信息准则和比特的不等保护度提出了一种新颖的16QAM星座映射方案。仿真分析表明:在中高信噪比下,所提出的新映射方案比传统Gray映射方案的信道容量最大改善值可达1.18bit/channel。结合低密度奇偶校验(LDPC)码并借助外部信息传递(EXIT)图,该方案在光通信系统中具有很好的性能优势与应用前景。 展开更多
关键词 星座映射 BICM-ID 信道容量 互信息准则 光通信系统
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基于BICM-ID的多址接入协同中继系统的性能研究 认领 引用
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作者 吴湛击 杨帆 尉乐 《系统工程与电子技术》 EI CSCD 北大核心 2014年第5期973-978,共6页
为了提高联合网络编码调制在多址接入中继系统的上行链路衰落信道下的性能,提出了在中继节点处使用卷积码与16进制正交幅度调制改进集分割映射星座映射方式相匹配的联合编码调制方式,并在基站处设计了相应的迭代译码解调方案。通过衰落... 为了提高联合网络编码调制在多址接入中继系统的上行链路衰落信道下的性能,提出了在中继节点处使用卷积码与16进制正交幅度调制改进集分割映射星座映射方式相匹配的联合编码调制方式,并在基站处设计了相应的迭代译码解调方案。通过衰落信道下系统误比特率的性能渐近限和外信息转移图的分析,证明了在衰落信道下,改进集分割映射在卷积码迭代译码方案下优于传统格雷映射方式。软件仿真结果也证明了在瑞利衰落信道下,改进集分割映射相对于传统格雷映射方法在误码率为10-5时获得了4dB的显著性能增益。 展开更多
关键词 网络编码 比特交织编码调制迭代译码 错误平层 外信息转移图 瑞利衰落信道
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