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A NEW LABELING SEARCH ALGORITHM FOR BIT-INTERLEAVED CODED MODULATION WITH ITERATIVE DECODING 认领 引用
1
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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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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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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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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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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BICM在差分跳频系统中的应用 认领 引用 被引量：10
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作者 朱毅超 甘良才 +1 位作者 熊俊俏 郭见兵 《电波科学学报》 EI 北大核心 2009年第1期15-21,共7页
将比特交织编码调制(BICM)技术应用于差分跳频(DFH)通信系统,在加性白高斯噪声(AWGN)信道及频率非选择性瑞利慢衰落信道下,对采用无迭代译码及迭代译码的系统比特误码率(BER)上界进行了理论推导及数值仿真验证,并与传统的差分跳频系统... 将比特交织编码调制(BICM)技术应用于差分跳频(DFH)通信系统,在加性白高斯噪声(AWGN)信道及频率非选择性瑞利慢衰落信道下,对采用无迭代译码及迭代译码的系统比特误码率(BER)上界进行了理论推导及数值仿真验证,并与传统的差分跳频系统的性能进行了比较。其数值仿真结果表明:采用BICM技术的差分跳频系统,可以在不增加跳频带宽及译码复杂度的情况下,利用最优卷积码增大了其G函数网格图的最小自由距离。同时对于可用频率数为16的无迭代译码BICM/DFH,当BER为10-5时,在瑞利信道下相对于CHESS系统而言,其性能改善可达6dB。若采用迭代译码,则当BER为10-7时,其性能相对于无迭代译码可进一步改善3 dB。 展开更多
关键词 差分跳频(DFH) 比特交织编码调制(BICM) 迭代译码
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基于逐比特MAP算法的Turbo编码调制方式 认领 引用 被引量：6
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作者 左健存 宋文涛 +1 位作者 徐友云 罗汉文 《上海交通大学学报》 EI CAS 北大核心 2003年第6期812-815,共4页
给出了一种基于逐比特 MAP算法的 Turbo编码与多元调制相结合的编码调制方式 .该编码调制方式通过删截 Turbo码的校验位以获得高编码效率 ,将复用后的编码输出以 Gray映射方式与多元调制结合从而获得高频带利用率 ,并采用逐比特 MAP算... 给出了一种基于逐比特 MAP算法的 Turbo编码与多元调制相结合的编码调制方式 .该编码调制方式通过删截 Turbo码的校验位以获得高编码效率 ,将复用后的编码输出以 Gray映射方式与多元调制结合从而获得高频带利用率 ,并采用逐比特 MAP算法进行迭代译码 .仿真结果表明 ,将 Turbo码的高编码增益与多元调制的高频谱利用率有效地结合在一起 ,是一种功率和频谱高效的编码调制方式 ,它比传统的网格编码调制 ( TCM) 展开更多
关键词 Turbo码 多元调制 逐比特最大后验概率算法 编码调制 迭代译码
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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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基于多符号分组的CPM软输出非相干检测算法 认领 引用 被引量：3
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作者 杨友福 刘建伟 +1 位作者 张其善 修春娣 《通信学报》 EI CSCD 北大核心 2012年第8期113-118,共6页
提出了一种CPM非相干检测算法,以连续多个符号为观测窗计算码字先验概率,以此完成CPM软解调计算操作,算法性能随着观测符号长度增加而提高。给出了非相干接收机结构,利用Walsh基函数扩展方法减少匹配接收计算量。仿真研究了不同CPM调制... 提出了一种CPM非相干检测算法,以连续多个符号为观测窗计算码字先验概率,以此完成CPM软解调计算操作,算法性能随着观测符号长度增加而提高。给出了非相干接收机结构,利用Walsh基函数扩展方法减少匹配接收计算量。仿真研究了不同CPM调制参数下卷积编码CPM系统非相干检测性能,结果表明,提出的非相干检测算法具有很好的顽健性,对于2CPM、4CPM串行级联编码调制,当观测长度为4个符号时,系统性能较单符号非相干检测算法有近6dB增益。 展开更多
关键词 CPM 串行级联编码调制 非相干检测 迭代译码
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BI-STCM-ID系统的标识映射设计及性能分析 认领 引用 被引量：6
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作者 宫丰奎 葛建华 李兵兵 《计算机学报》 EI CAS 北大核心 2006年第4期561-569,共9页
重点研究了对比特交织空时编码及迭代译码系统(BI-STCM-ID)性能影响较大的标识映射方法,提出了给定区间最佳映射(DRO)的设计方法以及自适应标识映射集的思想.通过对各种映射方法特征参数及渐进BER性能限的分析,得出了瑞利衰落信道环境... 重点研究了对比特交织空时编码及迭代译码系统(BI-STCM-ID)性能影响较大的标识映射方法,提出了给定区间最佳映射(DRO)的设计方法以及自适应标识映射集的思想.通过对各种映射方法特征参数及渐进BER性能限的分析,得出了瑞利衰落信道环境下决定BICM-ID以及BI-STCM-ID系统性能的关键参数,进而给出了标识映射设计的参考准则. 展开更多
关键词 比特交织空时编码调制 迭代译码 标识映射 自适应标识
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基于三种调制模式下的turbo码光无线通信系统分析 认领 引用 被引量：6
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作者 陈俊 黄德修 元秀华 《光子学报》 EI CAS 北大核心 2007年第4期694-697,共4页
从分析大气对光无线通信系统的影响出发,研究了大气信道特性,建立了大气信道信噪比和能见度的关系.为降低系统误码率,提出了基于OOK、BPSK、BPPM三种调制模式的turbo码的编码方案,推导出三种不同方案对应的turbo码迭代MAP算法.应用建立... 从分析大气对光无线通信系统的影响出发,研究了大气信道特性,建立了大气信道信噪比和能见度的关系.为降低系统误码率,提出了基于OOK、BPSK、BPPM三种调制模式的turbo码的编码方案,推导出三种不同方案对应的turbo码迭代MAP算法.应用建立的信噪比关系,分析和计算了基于三种不同方案的系统的误码率.结果表明,基于BPSK的turbo码系统比OOK和BPPM系统的信噪比降低约3dB,且在高的信噪比情况下,BPSK系统能显著降低系统的误码率.因此,基于BPSK的turbo码方案较适合光无线通信系统. 展开更多
关键词 光无线通信 调制模式 turbo码 迭代MAP译码 误码率
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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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一种面向物联网的轻量级增强型长距离物理层设计方法 认领 引用 被引量：2
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作者 谢桂辉 唐晓庆 +1 位作者 焦向开 李乳演 《电子与信息学报》 EI CAS CSCD 北大核心 2021年第12期3612-3620,共9页
为了提高LoRa在衰落信道下的误码率性能,该文设计了一种轻量级的增强型长距离(EnLoRa)物理层。首先,采用循环码移位键控(CCSK)作为纠错码,级联对角矩阵交织和啁啾扩频(CSS)调制技术,构造了一种新的比特交织编码调制(BICM)结构。然后,基... 为了提高LoRa在衰落信道下的误码率性能,该文设计了一种轻量级的增强型长距离(EnLoRa)物理层。首先,采用循环码移位键控(CCSK)作为纠错码,级联对角矩阵交织和啁啾扩频(CSS)调制技术,构造了一种新的比特交织编码调制(BICM)结构。然后,基于该结构,提出了一种基于比特对数似然比信息的软CSS解调和软译码算法,并将译码输出后的外信息作为先验信息反馈至解调模块,进行迭代译码。仿真结果表明,与相同码率的LoRa系统对比,EnLoRa系统在高斯信道下的编码增益提高了0.8 dB,在瑞利信道下的编码增益提高了7 dB。在此基础之上,通过多次迭代译码,还可以获得最大2.5 d B的额外收益。时间复杂度增加不到10%,空间复杂度增幅可忽略不计。该方法可望进一步降低物联网节点的功耗,在室内、市区和工业等复杂多径场景具有较大的应用价值。 展开更多
关键词 循环码移位键控 比特交织编码调制 比特对数似然比 迭代译码
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联合多元信道编码调制-网络编码方案 认领 引用 被引量：2
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作者 佟宁宁 赵旦峰 吴宇平 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2014年第6期753-759,共7页
为了使协作中继通信系统在有效性和可靠性之间获得较好的折中,提出一种新型的联合多元信道编码调制-网络编码一体化设计方案,即多元低密度奇偶校验码(low-density parity-check codes,LDPC)-比特交织编码调制(bit interleaved coded mod... 为了使协作中继通信系统在有效性和可靠性之间获得较好的折中,提出一种新型的联合多元信道编码调制-网络编码一体化设计方案,即多元低密度奇偶校验码(low-density parity-check codes,LDPC)-比特交织编码调制(bit interleaved coded modulation,BICM)-网络编码方案。该方案将多元信道编码调制技术与网络编码技术在中继节点相结合,译码时考虑到序列的相关性,采用联合迭代相关译码算法,在保证系统的有效性的同时,提高了系统的可靠性。仿真结果表明:联合多元信道编码调制-网络编码方案与无中继系统、信源不相关的多元LDPC-BICM系统相比,均可获得较好编码增益,大幅度提高了系统的可靠性。 展开更多
关键词 多元LDPC码 网络编码 比特交织编码调制 相关译码 迭代译码 瑞利信道 协作通信 高可靠性
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