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基于偶位GOLD码的超宽带多径信道性能分析
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作者 李瑞 张朝霞 王华奎 《中国新技术新产品》 2010年第10期27-27,共1页
超宽带系统中跳时码的选择对于系统的性能至关重要,本文在深入研究偶位Gold码的各项指标的基础上,通过用偶位Gold码来代替传统的跳时码,对脉位调制(PPM)和脉幅调制(PAM)的超宽带系统在修正S-V信道下进行Matlab仿真。并对在ARake,PRake和... 超宽带系统中跳时码的选择对于系统的性能至关重要,本文在深入研究偶位Gold码的各项指标的基础上,通过用偶位Gold码来代替传统的跳时码,对脉位调制(PPM)和脉幅调制(PAM)的超宽带系统在修正S-V信道下进行Matlab仿真。并对在ARake,PRake和SRake三种接收机模型下的误码率进行了比对分析。仿真结果表明,偶位Gold码具有比传统跳时码和平衡Gold码都低的误码率。 展开更多
关键词 超宽带 Gold码偶位码 多径信道 RAKE接收机 误码率
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基于m序列扩频码的研究 被引量:9
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作者 贾怀义 毕红军 宫剑 《北方交通大学学报》 CSCD 北大核心 2001年第3期85-88,共4页
以Gold码偶位码为基础给出了m序列偶位码的定义 ,又提出了m序列奇数位码和双偶码的概念 ,并分析了它们的相关特性 。
关键词 扩频码分多址 M序列 相关特性 GOLD码 偶位码 码分多址通信 奇数位码
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Design of bilayer lengthened LDPC codes over expanded graph for relay channels
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作者 刘洋 Li Ying Su Yuping 《High Technology Letters》 EI CAS 2015年第4期494-499,共6页
This paper presents a low complexity optimized algorithm for design of bilayer lengthened LDPC(BL-LDPC) code for decode-and-forward relay system.The design is performed over the expanded graph of the BL-LDPC code,whic... This paper presents a low complexity optimized algorithm for design of bilayer lengthened LDPC(BL-LDPC) code for decode-and-forward relay system.The design is performed over the expanded graph of the BL-LDPC code,which consists of the original bilayer graph and the extra added relaygenerated parity check bits.To build up our proposed optimized algorithm,we present a modified Gaussian approximation algorithm for the expanded structure of the BL-LDPC code.Then using the proposed optimized algorithm,we find the optimum overall expanded graph of the BL-LDPC code.Simulation results show that the BL-LDPC codes obtained by our proposed optimized algorithm have excellent bit-error-rate performances and small gaps between the convergence thresholds and the theoretical limits when transmitted over the additive white Gaussian noise channels. 展开更多
关键词 bilayer LDPC codes relay channel DECODE-AND-FORWARD Gaussian approxima- tion channel capacity
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Low-Density Parity-Check Codes for Noncoherent UWB Communication Systems 被引量:2
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作者 Zhonghua Liang Junshan Zang +2 位作者 Xiaojun Yang Xiaodai Dong Huansheng Song 《China Communications》 SCIE CSCD 2017年第7期152-162,共11页
In order to guarantee reliable data transmission, powerful channel coding techniques are usually required in noncoherent ultra-wideband(UWB) communication systems. Accordingly, several forward error correction(FEC) co... In order to guarantee reliable data transmission, powerful channel coding techniques are usually required in noncoherent ultra-wideband(UWB) communication systems. Accordingly, several forward error correction(FEC) codes, such as Reed-Solomon and convolutional codes have been used in noncoherent UWB systems to improve the bit error rate(BER) performance. In this paper, low-density parity-check(LDPC) codes are further studied as more powerful FEC candidates for noncoherent UWB systems. Two LDPC codes and the corresponding decoding procedures are presented for noncoherent UWB systems. Moreover, performance comparison between the LDPC codes and other FEC codes are provided for three major noncoherent UWB communication systems, namely, noncoherent pulse position modulation(NC-PPM), transmitted reference(TR) and transmitted reference pulse cluster(TRPC). Both theoretical analysis and simulation results show that the two investigated LDPC codes outperform other existing FEC codes with limited penalty in terms of complexity and therefore they are promising FEC candidates for noncoherent UWB systems with low-cost and low-power consumption. 展开更多
关键词 UWB NONCOHERENT channel coding LDPC codes
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