面向星地融合网络的CPM信号研究进展

doi:10.11959/j.issn.2096-8930.2023005

摘要/Abstract

摘要：

围绕6G的“全覆盖”愿景，星地融合作为核心技术之一，是未来无线通信系统发展的方向。建设星地融合网络、实现星地深度融合需要设计合理的物理层波形。针对星地融合信息传输面临的问题，分析连续相位调制（Continuous Phase Modulation, CPM）信号在频谱效率、能量效率上的显著优势与应用价值，从时频域的角度综述移动通信系统中CPM信号接收技术的研究进展，以期为后续星地融合中CPM相关研究提供支撑。

关键词: 6G, 星地融合, 连续相位调制

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

中图分类号:

TN393

潘子豪, 谢琛, 王桁, 郭道省. 面向星地融合网络的CPM信号研究进展[J]. 天地一体化信息网络, 2023, 4(1): 42-49.

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.

图/表 3

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参考文献 44

[1]	沈学民, 承楠, 周海波 ,等. 空天地一体化网络技术：探索与展望.物联网学报[J]. 物联网学报, 2020,4(3): 3-19.
	SHEN X M , CHENG N , ZHOU H B ,et al. Space-air-ground integrated networks:review and prospect[J]. Chinese Journal on Internet of Things, 2020,4(3): 3-19.
[2]	YOU X H , WANG C X , HUANG J ,et al. Towards 6G wireless communication networks:vision,enabling technologies,and new paradigm shifts[J]. Science China Information Sciences, 2020,64(1): 1-74.
[3]	LIU J , DU X Q , CUI J H ,et al. Task-oriented intelligent networking architecture for the space–air–ground integrated network[J]. IEEE Internet of Things Journal, 2020,7(6): 5345-5358.
[4]	DARSENA D , GELLI G , IUDICE I ,et al. Equalization techniques of control and non-payload communication links for unmanned aerial vehicles[J]. IEEE Access, 2018(6): 4485-4496.
[5]	倪育德, 邹玲, 刘瑞华 ,等. 北斗系统C波段导航信号调制方式及性能评估[J]. 系统工程与电子技术, 2022,44(12): 3800-3810.
	NI Y D , ZOU L , LIU R H ,et al. C-band navigation signal modulation mode and performance evaluation of BeiDou system[J]. Systems Engineering and Electronics, 2022,44(12): 3800-3810.
[6]	CHAMAA M E , LANKL B . Noncoherent symbol detection of short CPM bursts in frequency-selective fading channels[J]. IEEE Transactions on Wireless Communications, 2020,19(2): 771-782.
[7]	A product development flow for 5G/LTE envelope tracking power amplifiers[EB]. 2017.
[8]	XI Z P , ZHU J , FU Y M . Low-complexity detection of binary CPM with small modulation index[J]. IEEE Communications Letters, 2016,20(1): 57-60.
[9]	HO P , KIM J H . Pilot symbol-assisted detection of CPM schemes operating in fast fading channels[J]. IEEE Transactions on Communications, 1996,44(3): 337-347.
[10]	BROWN C , VIGNERON P J . Signal recovery for CPM in frequency flat fast fading channels[C]// Proceedings of MILCOM 2012 - 2012 IEEE Military Communications Conference. Piscataway:IEEE Press, 2012: 1-6.
[11]	NEUGEBAUER S P , DING Z . Blind SIMO channel estimation for CPM using the Laurent approximation[C]// Proceedings of 2004 IEEE International Symposium on Circuits and Systems. Piscataway:IEEE Press, 2004.
[12]	KAMMEYER K D , KUHN V , PETERMANN T . Blind and nonblind turbo estimation for fast fading GSM channels[J]. IEEE Journal on Selected Areas in Communications, 2001,19(9): 1718-1728.
[13]	ANTON-HARO C , FONOLLOSA J A R , FONOLLOSA J R . Blind channel estimation and data detection using hidden Markov models[J]. IEEE Transactions on Signal Processing, 1997,45(1): 241-247.
[14]	CIRPAN H A , TSATSANIS M K . Blind receivers for nonlinearly modulated signals in multipath[J]. IEEE Transactions on Signal Processing, 1999,47(2): 583-586.
[15]	NGUYEN H , LEVY B C . Blind and semi-blind equalization of CPM signals with the EMV algorithm[J]. IEEE Transactions on Signal Processing, 2003,51(10): 2650-2664.
[16]	钟凯, 彭华, 葛临东 . 基于隐马尔科夫模型的CPM信号盲Turbo均衡算法[J]. 通信学报, 2015,36(3): 227-235.
	ZHONG K , PENG H , GE L D . Blind Turbo equalization algorithm based on hidden Markov model for continuous phase modulation signals[J]. Journal on Communications, 2015,36(3): 227-235.
[17]	WANG X D , YANG Z G . Turbo equalization for GMSK signaling over multipath channels[C]// Proceedings of 2001 IEEE International Conference on Acoustics,Speech,and Signal Processing.Proceedings (Cat.No.01CH37221). Piscataway:IEEE Press, 2001: 2641-2644.
[18]	YANG Z , WANG X . Turbo equalization for GMSK signaling over multipath channels based on the Gibbs sampler[J]. IEEE Journal on Selected Areas in Communications, 2001,19(9): 1753-1763.
[19]	HANSSON A , CHUGG K M , AULIN T . On forward-adaptive versus forward/backward-adaptive SISO algorithms for Rayleigh fading channels[J]. IEEE Communications Letters, 2001,5(12): 477-479.
[20]	ANASTASOPOULOS A , CHUGG K M . Adaptive soft-input softoutput algorithms for iterative detection with parametric uncertainty[J]. IEEE Transactions on Communications, 2000,48(10): 1638-1649.
[21]	CHUNG K , CHUGG K M , HEO J . Reduced state adaptive SISO algorithms for serially concatenated CPM over frequency-selective fading channels[C]// Proceedings of GLOBECOM'01.IEEE Global Telecommunications Conference (Cat.No.01CH37270). Piscataway:IEEE Press, 2001: 1162-1166.
[22]	COLAVOLPE G , FERRARI G , RAHELI R . Reduced-state BCJRtype algorithms[C]// Proceedings of 2000 IEEE International Conference on Communications.ICC 2000.Global Convergence Through Communications.Conference Record. Piscataway:IEEE Press, 2000: 460-464.
[23]	CHUNG K , HEO J . RS-A-SISO algorithms for serially concatenated CPM over fading channels and density evolution analysis[J]. Electronics Letters, 2003,39(22): 1597.
[24]	HANSSON A , AULIN T . Generalized APP detection of continuous phase modulation over unknown ISI channels[J]. IEEE Transactions on Communications, 2005,53(10): 1615-1619.
[25]	钟凯, 彭华, 葛临东 . 基于FABA-SISO的时变频率选择性衰落信道CPM信号盲均衡[J]. 电子与信息学报, 2015,37(11): 2672-2677.
	ZHONG K , PENG H , GE L D . Blind equalization based on FABASISO for continuous phase modulation signals over time-varying frequency-selective fading channels[J]. Journal of Electronics ＆Information Technology, 2015,37(11): 2672-2677.
[26]	SUN P , WANG Z Y , SCHNITER P . Joint channel-estimation and equalization of single-carrier systems via bilinear AMP[J]. IEEE Transactions on Signal Processing, 2018,66(10): 2772-2785.
[27]	TAN J , STUBER G L . Frequency-domain equalization for continuous phase modulation[J]. IEEE Transactions on Wireless Communications, 2005,4(5): 2479-2490.
[28]	PANCALDI F , VITETTA G M . Equalization algorithms in the frequency domain for continuous phase modulations[J]. IEEE Transactions on Communications, 2006,54(4): 648-658.
[29]	刘永鑫, 赵明, 周世东 . CPFSK信号的频域均衡算法[J]. 清华大学学报(自然科学版), 2009,49(10): 91-94.
	LIU Y X , ZHAO M , ZHOU S D . Frequency-domain equalization for CPFSK[J]. Journal of Tsinghua University (Science and Technology), 2009,49(10): 91-94.
[30]	OZGUL B , KOCA M , DELIC H . Double turbo equalization of continuous phase modulation with frequency domain processing[J]. IEEE Transactions on Communications, 2009,57(2): 423-429.
[31]	BROWN C , VIGNERON P J . Equalisation for continuous phase modulation using basis functions[C]// SPIE Defense,Security,and Sensing.Proc SPIE 8061,Wireless Sensing,Localization,and Processing VI.[S.l.:s.n.], 2011: 63-73.
[32]	VAN T W , HORLIN F , NSENGA J ,et al. Low-complexity linear frequency domain equalization for continuous phase modulation[J]. IEEE Transactions on Wireless Communications, 2009,8(3): 1435-1445.
[33]	CHAYOT R , THOMAS N , POULLIAT C ,et al. A new exact lowcomplexity MMSE equalizer for continuous phase modulation[J]. IEEE Communications Letters, 2018,22(11): 2218-2221.
[34]	兰笑 . SOQPSK信号的频域均衡技术研究[D]. 西安:西安电子科技大学, 2019.
	LAN X . Research for SOQPSK signal with frequency domain equalization technology[D]. Xi'an:Xidian University, 2019.
[35]	VAN T W , HORLIN F , RAMON V ,et al. Novel block constructions using an intrafix for CPM with frequency domain equalization[J]. IEEE Transactions on Wireless Communications, 2010,9(3): 951-955.
[36]	BROWN C , VIGNERON P J . Channel estimation and equalisation for single carrier continuous phase modulation[C]// Proceedings of 2011- MILCOM 2011 Military Communications Conference. Piscataway:IEEE Press, 2011: 334-340.
[37]	CHAYOT R , THOMAS N , POULLIAT C ,et al. Channel estimation and equalization for CPM with application for aeronautical communications via a satellite link[C]// Proceedings of MILCOM 2017 - 2017 IEEE Military Communications Conference. Piscataway:IEEE Press, 2017: 888-893.
[38]	COLAVOLPE G , BARBIERI A . Simplified iterative detection of serially concatenated CPM signals[C]// Proceedings of GLOBECOM '05.IEEE Global Telecommunications Conference,2005. Piscataway:IEEE Press, 2015:5.
[39]	PARK C H , HEATH R W , RAPPAPORT T S . Frequency-domain channel estimation and equalization for continuous-phase modulations with superimposed pilot sequences[J]. IEEE Transactions on Vehicular Technology, 2009,58(9): 4903-4908.
[40]	MAZZENGA F . Channel estimation and equalization for M-QAM transmission with a hidden pilot sequence[J]. IEEE Transactions on Broadcasting, 2000,46(2): 170-176.
[41]	XI Z P , ZHU J , FU Y M . Low-complexity detection of binary CPM with small modulation index[J]. IEEE Communications Letters, 2016,20(1): 57-60.
[42]	杨大伟, 王红星, 刘传辉 ,等. 基于零阶椭圆球面波信号的连续相位调制及性能分析[J]. 系统工程与电子技术, 2021,43(8): 2311-2320.
	YANG D W , WANG H X , LIU C H ,et al. Continuous phase modulation based on zero order PSWF signal and its performance analysis[J]. Systems Engineering and Electronics, 2021,43(8): 2311-2320.
[43]	KASSAN K , FARèS H , GLATTLI D C ,et al. Performance vs.spectral properties for single-sideband continuous phase modulation[J]. IEEE Transactions on Communications, 2021,69(7): 4402-4416.
[44]	FARèS H , GLATTLI D C , LOUET Y ,et al. Power spectrum density of single side band CPM using lorenztian frequency pulses[J]. IEEE Wireless Communications Letters, 2017,6(6): 786-789.

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