面向星地融合网络的CPM信号研究进展

doi:10.11959/j.issn.2096-8930.2023005

Abstract

Abstract:

Around the vision of ＆quot;full coverage＆quot; of the new generation of mobile communication system (6G), satelliteterrestrial integration, as one of the key technologies, is the development direction of the future wireless communication system.The construction of satellite-terrestrial integration network and deep integration need reasonable waveforms at physical layer.In view of the problems of transmission in satellite-terrestrial integration, the signifi cant advantages and practicability of continuous phase modulation (CPM) signal in spectral effi ciency and energy effi ciency were analyzed.The research progress of CPM signal at receiver in mobile communication system from the time and frequency domain were discussed, which provided support for CPM related research in satellite-terrestrial integration in the future.

Key words: 6G, satellite-terrestrial integrated network, continuous phase modulation

CLC Number:

TN393

Zihao PAN, Chen XIE, Heng WANG, Daoxing GUO. Research Status of CPM for Satellite-Terrestrial Integrated Network[J]. Space-Integrated-Ground Information Networks, 2023, 4(1): 42-49.

Figures/Tables 3

References 44

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均衡方法分类			参考文献	特点	缺点
	数据辅助		[9-10]	利用已知的导频提供信道估计，通过设计导频位置及插值算法完成序列的信道估计	插入额外的数据会造成开销增大，尤其在时变信道下需要插入多个导频
时域均衡		统计量	[11-12]	根据接收信号，利用统计量提取信道信息	适合帧长较长的应用场景，在短帧条件下，统计量不足以抑制噪声带来的误差
	盲均衡	HMM	[13-16]	将CPM与信道建模成HMM，将信道估计和均衡转为求解HMM的问题	复杂度较高，与记忆长度呈指数关系O(M^L)，有一定概率得到局部极大值解
		MCMC	[17-18]	基于MCMC，对信道进行隐式估计	仅针对GMSK做了研究，不能保证适用于所有CPM信号
		自适应均衡	[19-25]	利用CPM和信道的联合网格，基于数据辅助的思想，将信道估计器嵌入分支度量的计算中	复杂度高，与记忆长度或序列长度呈指数关系O(M^L)或O(M^N)
单载波频域均衡			[27-40]	通过加入循环前缀能够有效对抗多径衰落，处理复杂度较低	（1）CPM在频域均衡前需要线性化表示；（2）需要加入额外的相位过渡符号保证相位连续；（3）额外的符号会增加开销

Research Status of CPM for Satellite-Terrestrial Integrated Network

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