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Adaptive Coding and Modulation Using Enhanced Turbo Codes for Meteor Burst Communication 认领 引用
1
作者 Ding Mengchuan Li Zhiyong +1 位作者 Wang Wei Li Xuekun 《China Communications》 SCIE EI CSCD 2026年第5期1-14,共14页
Meteor burst channels(MBC)exhibit significant randomness and non-stationarity,limiting the effectiveness of traditional fixed-rate transmission strategies.This paper proposes an adaptive coding and modulation(ACM)sche... Meteor burst channels(MBC)exhibit significant randomness and non-stationarity,limiting the effectiveness of traditional fixed-rate transmission strategies.This paper proposes an adaptive coding and modulation(ACM)scheme based on real-time channel state perception using enhanced Turbo codes.By leveraging the interleaving structure of Turbo codes to mitigate channel fading and incorporating multi-rate adaptation,the scheme dynamically adjusts symbol rate,modulation,and coding methods to improve spectral efficiency.Meanwhile,a joint evaluation mechanism integrating physical-layer signal to noise ratio(SNR)estimation and media access control(MAC)-layer frame error rate(FER)statistics is introduced to achieve dynamic optimization of switching thresholds in multipath channels.Simulation and experimental results demonstrate that the proposed scheme significantly enhances system adaptability to MBC,and increases data transmission success rates,offering a more efficient and reliable solution for MBC systems. 展开更多
关键词 ACM enhanced turbo codes MAC-layer meteor burst channels
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Interleaver Design Method for Turbo Codes Based on Genetic Algorithm 认领 引用 被引量：2
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作者 Tan Ying Sun Hong Zhou Huai-bei 《Wuhan University Journal of Natural Sciences》 EI CAS 2004年第3期323-326,共4页
This paper describes a new interleaver construction technique for turbo code.The technique searches as much as possible pseudo-random interleaving patterns under a certain condition using genetic algorithms(GAs).The n... This paper describes a new interleaver construction technique for turbo code.The technique searches as much as possible pseudo-random interleaving patterns under a certain condition using genetic algorithms(GAs).The new interleavers have the superiority of the S-random interleavers and this interleaver construction technique can reduce the time taken to generate pseudo-random interleaving patterns under a certain condition.The results obtained indicate that the new interleavers yield an equal to or better performance than the S-random interleavers.Compared to the S-random interleaver,this design requires a lower level of computational complexity. 展开更多
关键词 interleaver Turbo codes genetic algorithm
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An Improved S-Random Interleaver Design for Turbo Code Based on Chaos Model 认领 引用 被引量：1
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作者 XIAO Dongliang SHI Hongling +1 位作者 SUN Hong JIAO Bingli 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第3期611-616,共6页
A new method to design interleaver based on Henon chaos model is presented. The designed interleaver is with rather random behavior. Experimental results show that the proposed S-henon interleaver make a magnitude of ... A new method to design interleaver based on Henon chaos model is presented. The designed interleaver is with rather random behavior. Experimental results show that the proposed S-henon interleaver make a magnitude of im provement in bit error rate （BER） performance by 0.4 dB compared with the S-random interleaver for AWGN channel respectively. The S-henon interleaver may be adapted to 3G mobile communication systems. 展开更多
关键词 turbo codes chaos interleaver Henon map
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Research on the transmission performance of turbo codes in DDO-OFDM system 认领 引用 被引量：1
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作者 童峥嵘 胡桂彬 +1 位作者 曹晔 张卫华 《Optoelectronics Letters》 EI 2015年第2期134-136,共3页
A direct detection optical orthogonal frequency division multiplexing(DDO-OFDM)system using turbo codes is built,and the transmission performance comparison between coded system and uncoded system is analyzed.Three de... A direct detection optical orthogonal frequency division multiplexing(DDO-OFDM)system using turbo codes is built,and the transmission performance comparison between coded system and uncoded system is analyzed.Three decoding algorithms,which are Log-maximum a posteriori(MAP),Max-Log-MAP and threshold Max-Log-MAP,are used in the turbo coded system.By comparing three decoding algorithms,the system using Max-Log-MAP algorithm has the best bit error rate(BER)performance.At the transmission distance of 240 km,the uncoded system with transmission rate of 30 Gbit/s can get the BER performance at the degree of 8.93×10-3 with optical signal to noise ratio(OSNR)of24 d B,while the turbo coded system with transmission rate of 50 Gbit/s can achieve it within OSNR of 20 d B. 展开更多
关键词 Bit error rate Decoding Error statistics Frequency division multiplexing Optical communication Optical signal processing Signal to noise ratio Turbo codes
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Optimization of Mapping Rule of Bit-Interleaved Turbo Coded Modulation with 16QAM 认领 引用 被引量：1
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作者 FEI Ze-song YANG Yu +1 位作者 LIU Lin-nan KUANG Jing-ming 《Journal of Beijing Institute of Technology》 EI CAS 2005年第1期18-21,共4页
Optimization of mapping rule of bit-interleaved Turbo coded modulation with 16 quadrature amplitude modulation(QAM)is investigated based on different impacts of various encoded bits sequence on Turbo decoding performa... Optimization of mapping rule of bit-interleaved Turbo coded modulation with 16 quadrature amplitude modulation(QAM)is investigated based on different impacts of various encoded bits sequence on Turbo decoding performance.Furthermore,bit-interleaved in-phase and quadrature phase(I-Q)Turbo coded modulation scheme are designed similarly with I-Q trellis coded modulation(TCM).Through performance evaluation and analysis,it can be seen that the novel mapping rule outperforms traditional one and the I-Q Turbo coded modulation can not achieve good performance as expected.Therefore,there is not obvious advantage in using I-Q method in bit-interleaved Turbo coded modulation. 展开更多
关键词 binary Turbo coded modulation quadrature amplitude modulation(QAM) mapping rule in-phase and quadrature(I-Q)coded modulation
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Henon CSK Secure Communication System Using Chaotic Turbo Codes 认领 引用 被引量：1
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作者 周小林 Song +4 位作者 Wentao Liu Jianbo Luo Hanwen 《High Technology Letters》 EI CAS 2002年第3期48-51,共4页
In this paper, the authors design a novel chaotic secure communication system, which has high security and good error correcting capability. Firstly, the Henon Chaos Shift Keying (CSK) modulation block is presented. S... In this paper, the authors design a novel chaotic secure communication system, which has high security and good error correcting capability. Firstly, the Henon Chaos Shift Keying (CSK) modulation block is presented. Secondly, chaotic turbo encoder/decoder (hard decision) is introduced. Thirdly, this chaotic secure communication system, which comprises the Henon CSK modulation block and chaotic turbo encoder in a serially concatenated form, is shown. Furthermore, a novel two step encryption scheme is proposed, which is based on the chaotic turbo encoded Henon CSK secure communication system. 展开更多
关键词 chaotic secure communication Henon CSK modulation/demodulation chaotic turbo codes
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Turbo Code Simulation in W-CDMA System 认领 引用 被引量：2
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作者 蒋朱成 尤肖虎 《Journal of Southeast University(English Edition)》 CAS 2000年第2期20-25,共6页
Turbo code has drawn more and more attractions for high data rate transmission these years especially in W CDMA and CDMA2000 of the third generation mobile communications systems. In this paper, the simulation perform... Turbo code has drawn more and more attractions for high data rate transmission these years especially in W CDMA and CDMA2000 of the third generation mobile communications systems. In this paper, the simulation performance of turbo code under Rayleigh fading channel and additive white Gaussian channels are depicted. Comparison with the performance of convolutional code are made respect to different parameters, such as pilot length, interleaver size, frame length, mobile velocity and data rate, etc. Faithful results are drawn out. 展开更多
关键词 W CDMA error correcting code turbo code pilot
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Puncturing Period on the Performance of Punctured Turbo Codes 认领 引用 被引量：1
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作者 Xu Heng\tian Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, Shanghai, China 《Wuhan University Journal of Natural Sciences》 EI CAS 2002年第3期319-322,共4页
Puncturing is the predominant strategy to construct high code rate turbo codes. Puncturing period is a crucial parameter influencing the performance of punctured turbo codes (PTC). Here we developed a new puncturing s... Puncturing is the predominant strategy to construct high code rate turbo codes. Puncturing period is a crucial parameter influencing the performance of punctured turbo codes (PTC). Here we developed a new puncturing scheme of turbo codes, with which the puncturing period on the performance of PTC is studied. Consequently, suggestions on selecting the puncturing period are proposed. 展开更多
关键词 Key words puncturing period puncturing table AWGN turbo codes
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Dual Adaptive Turbo Coded Modulation for Integrated Multimedia Service Transmission 认领 引用
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作者 左健存 宋文涛 +1 位作者 罗汉文 徐友云 《Journal of Donghua University(English Edition)》 EI CAS 2004年第1期72-77,共6页
This paper proposes a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile multimedia communication, which adapts to both the varying channel characteristics and the QoS of various mult... This paper proposes a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile multimedia communication, which adapts to both the varying channel characteristics and the QoS of various multimedia services simultancously to increase the average system throughput substantially. A pragmatic channeladaptive turbo coded modulation schcme, which comes within 2.5 dB of the Shannon limit, is optimally designed, and then a QoS-adaptive scheme is superimposed to build the dual adaptive architecture. Simulation results show that the novel dual adaption reduces the gap from the fading channel capacity to 2 dB when assuming different services occur in equal probability and the service duration follows exponential distribution. 展开更多
关键词 Dual adaption Turbo coded modulation Fading channels Multimedia services Spectral efficiency
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A proof of maximum contention-free property of interleavers for Turbo codes using permutation polynomials over integer rings 认领 引用
10
作者 MA Xin-rui XU You-yun ZHANG Le 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第1期24-27,共4页
It is well known that interleavers play a critical role in Turbo coding/decoding schemes, and contention-free interleaver design has become a serious problem in the paraUelization of Turbo decoding, which is indispens... It is well known that interleavers play a critical role in Turbo coding/decoding schemes, and contention-free interleaver design has become a serious problem in the paraUelization of Turbo decoding, which is indispensable to meet the demands for high throughput and low latency in next generation mobile communication systems. This paper unveils the fact that interleavers based on permutation polynomials modulo N are contention-free for every window size W, a factor of the intedeaver length N, which, also called maximum contention-free interleavers. 展开更多
关键词 Turbo codes Integer ring Permutation polynomial Interleaver Maximum contention-free （MCF）
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A channel- and QoS-adaptive turbo coded modulation architecture for mobile multimedia communication 认领 引用
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作者 左健存 Song Wentao +1 位作者 Luo Hanwen Xu Youyun 《High Technology Letters》 EI CAS 2009年第1期80-84,共5页
This paper proposed a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile muhimedia communication, which simultaneously adapted to both the varying channel characteristics and the qual... This paper proposed a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile muhimedia communication, which simultaneously adapted to both the varying channel characteristics and the quality of service （QoS） of various mobile multimedia services to increase the average system throughput substantially. A pragmatic channel-adaptive turbo coded modulation scheme, which comes within 2.5dB of the Shannon limit, was optimally designed, and then a QoS-adaptive scheme was superimposed to build the dual adaptive architecture. Simulation results show that the novel dual adaption reduces the difference with the fading channel capacity to 2dB when assuming different services occur in equal probability and the service duration follows the exponential distribution. 展开更多
关键词 dual adaption turbo coded modulation fading channels multimedia services spectral efficiency
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Pragmatic Approach to Adaptive Turbo Coded Modulation 认领 引用
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作者 左健存 宋文涛 +1 位作者 罗汉文 徐友云 《Journal of Systems Engineering and Electronics》 EI 2003年第4期20-24,94,共5页
This paper presents a pragmatic adaptive scheme for TuCM over slowly fading channels. The adaptive scheme employs a single turbo coded modulator composed of a variable-rate turbo encoder and a variable-rate variable-p... This paper presents a pragmatic adaptive scheme for TuCM over slowly fading channels. The adaptive scheme employs a single turbo coded modulator composed of a variable-rate turbo encoder and a variable-rate variable-power MQAM for all fading regions, so it has an acceptable complexity to implement. The optimal adaptive TuCM scheme is determined subject to various system constraints. Simulations have been performed to measure the performance of the scheme for different parameters. It is shown that adopting both the turbo coded modulator and the transmit power achieves a performance within 2.5 dB of the fading channel capacity. 展开更多
关键词 adaptive turbo coded modulation fading channels spectral efficiency.
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Improving the Structure of Multiple Dimension Turbo Codes Using Multiple Identical Component Encoders 认领 引用
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作者 WANG Zhenghai TIAN Mao WANG Yuhao 《Wuhan University Journal of Natural Sciences》 CAS 2010年第4期330-334,共5页
In this paper,we propose an improved structure for M-dimension(M≥2)turbo codes using M identical component encoders.The presented structure only applies single recursive convolutional encoder to encode M interleaved ... In this paper,we propose an improved structure for M-dimension(M≥2)turbo codes using M identical component encoders.The presented structure only applies single recursive convolutional encoder to encode M interleaved versions of infor-mation sequence and single tail sequence to operate termination.For the commonly used two-dimension(M=2)turbo codes,two cascade soft input soft output(SISO)decoders are detailed to de-code the corresponding codes.With the two cascade SISO decod-ers,this coding structure obviously outperforms traditional turbo codes at high code rates,especially,about 0.3 dB gain can be ob-tained at code rate 0.9 in additive white Gaussian noise channel with quadrature phase shift keying modulation.This makes the proposed coding structure very attractive for future radio commu-nication systems with high throughput requirements. 展开更多
关键词 turbo codes concatenated codes convolutional codes soft input soft output(SISO)
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Improving the BER performance of turbo codes with short frame size based on union bound 认领 引用 被引量：1
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作者 邵霞 Li Ping Zhang Weidang 《High Technology Letters》 EI CAS 2015年第3期309-314,共6页
timizing the formula, the energy for every bit of the codeword is optimized to achieve the minimum BER at high SNR region. At last, an adjustable parameter is employed to compensate the degrada- tions of BER at low an... timizing the formula, the energy for every bit of the codeword is optimized to achieve the minimum BER at high SNR region. At last, an adjustable parameter is employed to compensate the degrada- tions of BER at low and moderate SNR regions. Case studies indicate that the improvements of BER for turbo codes with short frame size are significant at a wide range of SNR 展开更多
关键词 channel coding bit error rate （BER） energy allocation turbo code
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Turbo Codes with Hybrid Interleaving Mode 认领 引用
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作者 李建平 Wang +2 位作者 Hongyuan Cai Dejun 《High Technology Letters》 EI CAS 2001年第4期50-53,共4页
In the investigation of turbo codes, either random interleavers or structured interleavers are used. Combined two kinds of interleavers in one turbo encoder, a hybrid interleaving mode is proposed in this paper. Compu... In the investigation of turbo codes, either random interleavers or structured interleavers are used. Combined two kinds of interleavers in one turbo encoder, a hybrid interleaving mode is proposed in this paper. Computer simulations show that the performance of turbo codes with the hybrid interleaving mode is better than that with the typical interleaving mode. 展开更多
关键词 Turbo codes Interleaver Encoder
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Log Likelihood Ratio-Based Relaying for Distributed Turbo Codes 认领 引用
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作者 Peiyao Yang Hai Li Shujuan Hou 《Journal of Beijing Institute of Technology》 EI CAS 2018年第2期176-181,共6页
A distributed turbo codes（ DTC） scheme with log likelihood ratio（ LLR）-based threshold at the relay for a two-hop relay networks is proposed. Different from traditional DTC schemes,the retransmission scheme at the... A distributed turbo codes（ DTC） scheme with log likelihood ratio（ LLR）-based threshold at the relay for a two-hop relay networks is proposed. Different from traditional DTC schemes,the retransmission scheme at the relay,where imperfect decoding occurs,is considered in the proposed scheme. By employing a LLR-based threshold at the relay in the proposed scheme,the reliability of decoder-LLRs can be measured. As a result,only reliable symbols will be forwarded to the destination and a maximum ratio combiner（ MRC） is used to combine signals received from both the source and the relay. In order to obtain the optimal threshold at the relay,an equivalent model of decoderLLRs is investigated,so as to derive the expression of the bit error probability（ BEP） of the proposed scheme under binary phase shift keying（ BPSK） modulation. Simulation results demonstrate that the proposed scheme can effectively mitigate error propagation at the relay and also outperforms other existing methods. 展开更多
关键词 cooperative communication relaying scheme distributed turbo codes log likelihood ratio（LLR）
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NEW ITERATIVE SUPER-TRELLIS DECODING WITH SOURCE A PRIORI INFORMATION FOR VLCS WITH TURBO CODES 认领 引用 被引量：3
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作者 Liu Jianjun Tu Guofang Wu Weiren 《Journal of Electronics(China)》 2007年第1期122-127,共6页
A novel Joint Source and Channel Decoding (JSCD) scheme for Variable Length Codes (VLCs) concatenated with turbo codes utilizing a new super-trellis decoding algorithm is presented in this letter. The basic idea of ou... A novel Joint Source and Channel Decoding (JSCD) scheme for Variable Length Codes (VLCs) concatenated with turbo codes utilizing a new super-trellis decoding algorithm is presented in this letter. The basic idea of our decoding algorithm is that source a priori information with the form of bit transition probabilities corresponding to the VLC tree can be derived directly from sub-state transitions in new composite-state represented super-trellis. A Maximum Likelihood (ML) decoding algorithm for VLC sequence estimations based on the proposed super-trellis is also described. Simu-lation results show that the new iterative decoding scheme can obtain obvious encoding gain especially for Reversible Variable Length Codes (RVLCs),when compared with the classical separated turbo decoding and the previous joint decoding not considering source statistical characteristics. 展开更多
关键词 Joint Source and Channel Decoding （JSCD） Variable Length Codes （VLCs） Turbo codes Super-trellis
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Turbo Codes with Modified Code-matched Interleaver over A WGN and Rayleigh Fading Channel 认领 引用 被引量：1
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作者 罗骥 张曦林 袁东风 《Chinese Journal of Aeronautics》 EI CAS 2005年第2期147-152,共6页
A novel Code-Matched interleaver is proposed which decreases the number of the low weight codewords to improve the performance of the Turbo code. The modified design can adapt more kinds of Turbo codes determined by t... A novel Code-Matched interleaver is proposed which decreases the number of the low weight codewords to improve the performance of the Turbo code. The modified design can adapt more kinds of Turbo codes determined by the generator matrix, while it doesn＇t decrease the bit error rate performance of Turbo codes at moderate to high signal to noise ratio. At the same time, in Rayleigh fading channel, the new Code-Matched interleaver can also debase the error floor. 展开更多
关键词 Turbo interleaver weight distribution Code-Matched distance spectrum
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DIFFERENTIAL AMPLITUDE PHASE SHIFT KEYING: A NEW MODULATION METHOD FOR TURBO CODE IN DIGITAL RADIO BROADCASTING 认领 引用 被引量：2
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作者 Khalid H. Sayhood Wu Lenan 《Journal of Electronics(China)》 2003年第2期86-96,共11页
The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Com... The multilevel modulation techniques nf M-Differential Amplitude Phase Shift Keying (DAPSK) have been proposed in combination with Turbo code scheme for digital radio broadcasting bands below 30 MHz radio channel. Comparison of this modulation method with channel coding in an Additive White Gaussian Noise (AWGN) and multi-path fading channels has been presented. The analysis provides an iterative decoding of the Turbo code. 展开更多
关键词 DAPSK system Turbo code Digital radio broadcasting
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Performance analysis of adaptive turbo coded modulation with time delay 认领 引用
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作者 伍守豪 宋文涛 罗汉文 《Journal of Systems Engineering and Electronics》 2004年第1期73-77,共5页
The method of data fitting is applied to obtain the BER expression for turbo coded modulation, and a fitting mathematical model is proposed, which resolves the problem that there is no exact BER expression for turbo c... The method of data fitting is applied to obtain the BER expression for turbo coded modulation, and a fitting mathematical model is proposed, which resolves the problem that there is no exact BER expression for turbo coded modulation in performance analysis. With the time delay consideration, the performance of BER of adaptive turbo coded modulation is analyzed and simulated. The results show that adaptive turbo coded modulation is very sensitive to time delay. In order to meet the target BER requirement, the total time delay should be less than 0 001/f D. 展开更多
关键词 turbo coded modulation bit error rate time delay
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