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基于Watterson短波信道模型,构建了Turbo码在短波信道下的设计和仿真方法。在高信噪比区域中,推导出了不同信道条件下Turbo码的性能界公式;在低信噪比区域中,用Matlab仿真了短波信道下不同的信道条件及Turbo码的主要设计参数对其性能的影响,并给出了Turbo码在短波信道下的设计参数,为实际工程中的应用提供参考。 相似文献
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衰落信道下Turbo码在宽带CDMA系统中的应用研究 总被引:5,自引:0,他引:5
本文在研究Turbo码在衰落信道下典型性能分析的基础上,提出了在宽带CDMA系统中结合RAKE接收机实现路径分集后Turbo码的性能分析方法.在高斯和衰落信道下,采用计算机仿真进行了实际系统的模拟,结果表明宽带CDMA系统中Turbo码对抗衰落的性能有了很大提高. 相似文献
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Turbo乘积码(TPC)自从被提出以来表现出了优异的性能。研究了利用扩展汉明码作为其子码的TPC在Rayleigh信道下的性能.给出了不同的子码以及不同的迭代次数下的性能曲线,仿真结果表明了TPC在Rayleigh信道中同样有较强的纠错能力。 相似文献
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Turbo码作为一种新颖的信道编码,可以获得接近香农理论极限的性能,IMT-2000已经将Turbo码作为第三代移动通信系统(3G)传输高速业务数据的信道编码标准之一.文中提出了一种在衰落信道下Turbo码的实现模型,并探讨了Turbo编、译码器的设计及其算法,最后用MATLAB语言完成了算法的仿真实现.仿真结果表明,在低信噪比的无线衰落信道中,Turbo码不仅可以获得更大的编码增益,有效地改善系统的性能,而且具有很强的抗衰落、抗干扰能力,在移动通信系统中有着很大的应用潜力. 相似文献
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Petri提出了超正交卷积Turbo码(Superorthogonal Convolutional Turbl Gode,SCTC)^「1」。由于 宽的扩展,这类码的性能比一般的Turbo码好,本文推导了一般SCTC码的构,同时导出了存储单元分别为2,3的SCTC的转移函数。分别给出了高斯信道下非相关瑞利衰落信道下SCTC码的误码率性能上限,以及计算机模拟的高斯信道,非相关瑞处衰落信道和相关瑞利衰 相似文献
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基于Turbo码和网格编码调制的特点,介绍了TTCM(Turbo Trellis Coded Modulation)的基本结构及编译原理,结合3G中IMT2000标准的具体要求,提出一种TTCM方案,并在室内和车载信道环境下进行性能仿真,然后与标准中提出的1/3码率Turbo码性能比较,得出TTCM系统不仅能获得较好的传输质量,同时更能有效地提高频带利用率,是一种最佳的选择方案。 相似文献
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针对卫星移动通信的连续信道帧结构的特点,设计了删除部分信息的打孔Turbo码.该码型通过删除传输信息特定位置上的系统信息或者校验信息,来提升Turbo码的码率,由此可在每组Turbo码的头部添加同步信息.通过仿真表明,合理设计打孔的长度和位置,可以获得较为理想的打孔Turbo码性能. 相似文献
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从Turbo码在加性高斯白噪声(AWGN additive white Gaussian noise)信道下的理论分析出发,讨论了Turbo码在瑞利衰落信道下的算法改进。 相似文献
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性能接近Turbo卷积码的Turbo三维乘积码 总被引:1,自引:1,他引:0
目前一般认为采用迭代译码的Turbo卷积码适合于低码率的情况。而Tur-bo分组码,尤其是Turbo乘积码,则较适合于高码率的应用。文中使用Pyndiah提出的方法研究了Turbo三维乘积码,用试探法对分组失代译码的参数进行了优化实验结果表明,在低码率应用时,例如码率为R=0.536的Turbo三维(32,26,4)^3乘积码的性能已与C.Berrou[1]的Turbo卷积码接近,它也应是低码率纠错应用中一个有竞争力的选择。 相似文献
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基于交织多址网络编码中继合作系统,分析了其采用Turbo编码后在多径信道环境下的系统性能。研究了该系统中利用不同交织器来实现多用户的多址接入方式以及网络编码的中继合作机制。将多径信道以及Turbo编码融入该系统中,搭建计算机仿真环境,通过仿真数据分析系统性能。仿真结果表明,在多径信道环境下,采用Turbo编码的交织多址网络编码中继合作系统的系统误码率有明显改善。 相似文献
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In this paper, we investigate the Multiple-Input Multiple-Output (MIMO) channel capacity in indoor Ricean channels based on MIMO channel measurements at 2.45 GHz. The measured data is analysed using a super resolution parameter estimation algorithm. Our results demonstrate that the line-of-sight (LOS) component in a Ricean scenario influences indoor MIMO performance through increased spatial correlation between array elements. We found that indoor channels with higher values of Ricean K factor have smaller numbers of effective multipath components and increased spatial correlation. Measurement results also showed that, the effect of varying antenna height on indoor MIMO capacity is also due to the spatial correlation of multipath propagation and has a close relationship with the separation between the transmitter and receiver.
Zhongwei Tang is currently with the Wireless Technologies Laboratory at CSIRO. He was with Microwave and Wireless Technology Research Laboratory (MWTRL), Information and Communication Group, Faculty of Engineering of the University of Technology Sydney, Australia, where he pursued his Ph.D. Degree. His current research interests include RF propagation, MIMO Space-Time channel measurements, characterization and channel modelling, smart antennas, MIMO systems and array signal processing.
Ananda S. Mohan is currently a member of the Faculty of Engineering, University of Technology, Sydney (UTS), Australia where he leads research on antennas, microwaves, wave propagation, and wireless technology. He received a Ph.D. degree in electrical communication engineering from the Indian Institute of Technology, Kharagpur, India and was a Scientist and Senior Scientist at the Research and Training Unit for Navigational Electronics, Hyderabad, India. At UTS, he directed the Sydney microwave design resource centre and was the associate program leader of the co-operative research centre for satellite systems. He currently directs the microwave and wireless technology research laboratory and a core member of the university research centre on health technologies. His current teaching and research interests include wireless mobile communications, microwaves and antennas, smart antennas and applications of microwave and wireless technology in medicine and has obtained many competitive research grants in these areas. Dr. Mohan was a co-recipient of the Priestly memorial award from the Institute of Radio and Electronic Engineers (IREE), Australia. He was a member of the organizing and technical Program Committees of the IEEE Globecom'98, APMC 2000, and International Symposium on Wireless Systems and Networks, 2003 and IASTED International Conference on Antennas, Radar, and Wave Propagation, for 2004 and 2005. 相似文献
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在Turbo码设计中,交织器的设计具有重要的地位。介绍了交织器的基本理论以及几种常见的交织器,给出了一种通用交织器的电路设计方案,并通过对两种交织器的仿真测试,验证了设计方案的正确合理。 相似文献