AWGN信道中一维调制与二维调制的信道容量

	AWGN信道中一维调制与二维调制的信道容量
	夏国江 ; 熊蔚明 ; 孙辉先
刊名	空间科学学报
	2008
卷号	28 期号:2 页码:180-184
关键词	信道容量一维调制二维调制香农限高斯白噪声
ISSN号	0254-6124
其他题名	Capacity of One-dimensional and Two-dimensional Modulation Under AWGN Channels
通讯作者	北京8701信箱
中文摘要	卫星通信和深空通信信道都可近似为加性高斯自噪声信道,所以研究这种信道中常用调制方式下的信道容量有重要意义.从香农信息论出发,推导出了一维调制和二维调制下的信道容量.在此基础上,阐明了在不同信噪比条件下应采用的调制方式,以及编码调制能够在不牺牲频谱利用率的前提下,得到编码增益的本质.讨论了无带宽约束下AM调制和PSK调制的香农限和在高信噪比条件下PSK的近似容量.
英文摘要	Satellite and deep space communication channels are regarded approximately as white Gaussian noise channels approximately, so it's significant to study on channel capacities using usual modulation schemes under this channel. Starting frorn Shannon's information theory, this paper develops the channel capacities of one-dimensional and two-dimensional modulation schemes.Based on above,it explains that special modulation schemes ought to be adopted according to different signal to noise ratio. For example,BPSK modulation schemes is used in deep space communication because of very low signal to noise ratio. It also explains the essential of coding gain with the same spectral efficiency applying coded modulation. For instance, a rate R=2/3 convolutional code can be combined with 8-PSK modulation which can be compared with uncoded (aPSK modulation, since they both have the same spectral efficiency of"=2 bit/symbol. The Shannon's limit of AM and PSK without bandwidth constraint a,nd the asymptotic capacity of PSK with high signal to ratio are discussed at the end of this paper.
学科主题	空间技术
收录类别	CSCD
资助信息	中国科学院创新课题
语种	中文
CSCD记录号	CSCD:3222267
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/776]
专题	国家空间科学中心_空间技术部
推荐引用方式 GB/T 7714	夏国江,熊蔚明,孙辉先. AWGN信道中一维调制与二维调制的信道容量[J]. 空间科学学报,2008,28(2):180-184.
APA	夏国江,熊蔚明,&孙辉先.(2008).AWGN信道中一维调制与二维调制的信道容量.空间科学学报,28(2),180-184.
MLA	夏国江,et al."AWGN信道中一维调制与二维调制的信道容量".空间科学学报 28.2(2008):180-184.