开环结构突发PSK信号载波同步算法研究
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摘要
载波恢复单元是解调器的关键部分。在一个时分多址(TDMA)通信网络中，多个用户通过不同的时间段共享一个传输线路(或者信道)的带宽资源，每个用户只能在分配给自己的时间段内进行通信，这种突发方式信号的解调要求载波恢复要在很短的时间内完成，我们以往在连续信号解调器中采用的COSTAS环等方法很难适应这种要求。为此，人们提出了一种基于开环结构的PSK解调的相位估计法。通过软件处理和算法实现载波恢复。本文主要研究了采用开环结构进行载波恢复的相位估计法，并对软件无线电在解调领域中的一些思想和应用进行讨论，在文章最后对[文献2]提出的算法进行了仿真、分析，并给出了仿真结论。
Carrier recovery is an important part of demodulators . In a TDMA network, multiple users share the common medium (or channel) and bandwidth but different intervals of time. In case of the burst mode , the carrier of the modulated signal needs to be synchronized in a very short time. The common approaches such as a COSTAS-loop and so on are no longer suitable any more. So, people proposed an open-loop-based method for estimating the carrier frequency offset of the signal with random data . It accomplishes the carrier recovery of the signal by software processings. In this dissertation we discuss mainly about the open-loop estimator, and the software radio ideas and applications in demodulation fields are mentioned too. The simulation and the conclusion are given at the end.
Carrier recovery is an important part of demodulators . In a TDMA network, multiple users share the common medium (or channel) and bandwidth but different intervals of time. In case of the burst mode , the carrier of the modulated signal needs to be synchronized in a very short time. The common approaches such as a COSTAS-loop and so on are no longer suitable any more. So, people proposed an open-loop-based method for estimating the carrier frequency offset of the signal with random data . It accomplishes the carrier recovery of the signal by software processings. In this dissertation we discuss mainly about the open-loop estimator, and the software radio ideas and applications in demodulation fields are mentioned too. The simulation and the conclusion are given at the end.
引文
1. Larry Kenney, Signal Acquistion with a Digital PLL senior systems engineer with the tactical information systems group at AlliedSignal Inc
2. Viterbi A J, Viterbi A M. Nonlinear estimation of PSK modulated carrier phase with application to burst digital transmission[J]. IEEE Trans Inform, 1983, 29(4): 543-551.
3. Tretter S A. Estimating the frequency of a noisy sinusoid by linear regression[J]. IEEE Trans Inform, 1985, 31(6): 832-835.
4. Kay S. A fast and accurate single frequency estimation[J]. IEEE Trans Inform, 1989, 37(12): 1987-1990.
5．朱健军，姚庆栋，全数字无前导字突发模式PSK接收机，电路与系统学报，2001年3月
6．杨小牛，楼才义，徐建良，软件无线电原理与应用，电子工业出版社 2001
7. marco luise and ruggero reggiannini, carrier frequency recovery in all-digital modems for burst-mode transmissions, 1995 IEEE, 0090-6778
8. Yimin Jiang, Robert L. Richmond, John S. Baras, Carrier Frequency Estimation of MPSK Modulated Signals, CSHCN T.R. 99-3, (ISR T. R. 99-10)
9. LESLEY PHILLIP SABEL, A Maximum Likelihood Approachto Symbol Timing Recovery in Digital Communications, School of Electronic Engineering University of South Australia The Levels, South Australia, 5095, 22nd October, 1993
10．霍长勤，马正新，曹志刚，MPSK信号判决预测载波相位估计，清华大学学报(自然科学版)》1997年第37卷
11. Yan Wang, Erchin Serpedin and Philippe Ciblat, Optimal Blind Carrier Recovery for M-PSK Burst Transmissions, IEEE TRANSACTIONS ON COMMUNICATIONS
12. Paden B E. A matched nonlinearity for pase estimation of a PSK modulated carrier. IEEE Trans Infrom, 1986, 32(3): 419-422.
13. Lin Jiaru and Li Jinling, Doppler Frequency Correction for (D)PSK in Mobile Radio Channel Training Center, Beijing University of Posts and
Telecommunications, Beijing 100088, P. R. China
14. Nele Noels, Heidi Steendam and Marc Moeneclaey, The true Cramer-Rao bound for estimating the carrier phase of a convolutionally encoded signal, Telecommunications and Information Processing (TELIN) department, Ghent University St-Pietersnieuwstraat 41, B-9000 Gent, Belgium
15. Michael P. Fitz, Further Results in the Fast Estimation of a Single Frequency
16. Fulvio Gini and Georgios B. Giannakis, Frequency Offset and Symbol Timing Recovery in Flat-Fading Channels: A Cyclostationary Approach
17. Nguyen Doan Vo and Tho Le-Ngoc, Fast Symbol Timing Recovery Techniques for Burst-mode Digital Demodulators, Dept. of ECE, McGill University, 3480 University Street, Montreal, Québec, Canada H3A 2A7
18. Jan-Jaap van de Beek, Estimation of Synchronization Parameters
19. Fulvio Gini and Georgios B. Giannakis, Frequency Offset and Symbol Timing Recovery in Flat-Fading Channels: A Cyclostationary Approach, IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 46, NO. 3, MARCH 1998
20．王士林 陆存乐 龚初光，现代数字调制技术，人民邮电出版社，1987年8月15045。总3360-无6407
21．姜建国 曹建中 高明玉，信号与系统分析基础，清华大学出版社 1994年2月ISBN-7-302-01415-9／TN。64
22. Sandeep Mukthavaram, Design and FPGA Implementation of an Adaptive Demodulator, B.S. E.E Osmania University, Hyderabad, India, 1997
23. Gardner F M. Hangup in phase lock loops[J]. IEEE Trans Comm, 1977, 25(10): 1210-1214.
24. W. C. Dam and D. P. Taylor, An adaptive maximum-likelihood receiverfor correlated Rayleigh-fading channel," IEEE Trans. Commun., vol. 42, pp. 2684-2692, Sept. 1994.
25. R. Mehlan, Y. Chen, and H. Meyr, A fully digital feedforward MSK demodulator with joint frequency offset and symbol timing estimation for burst mode mobile radio, IEEE Trans. Veh. Technol., vol. 42, pp. 434-443, Nov. 1993.
2. Viterbi A J, Viterbi A M. Nonlinear estimation of PSK modulated carrier phase with application to burst digital transmission[J]. IEEE Trans Inform, 1983, 29(4): 543-551.
3. Tretter S A. Estimating the frequency of a noisy sinusoid by linear regression[J]. IEEE Trans Inform, 1985, 31(6): 832-835.
4. Kay S. A fast and accurate single frequency estimation[J]. IEEE Trans Inform, 1989, 37(12): 1987-1990.
5．朱健军，姚庆栋，全数字无前导字突发模式PSK接收机，电路与系统学报，2001年3月
6．杨小牛，楼才义，徐建良，软件无线电原理与应用，电子工业出版社 2001
7. marco luise and ruggero reggiannini, carrier frequency recovery in all-digital modems for burst-mode transmissions, 1995 IEEE, 0090-6778
8. Yimin Jiang, Robert L. Richmond, John S. Baras, Carrier Frequency Estimation of MPSK Modulated Signals, CSHCN T.R. 99-3, (ISR T. R. 99-10)
9. LESLEY PHILLIP SABEL, A Maximum Likelihood Approachto Symbol Timing Recovery in Digital Communications, School of Electronic Engineering University of South Australia The Levels, South Australia, 5095, 22nd October, 1993
10．霍长勤，马正新，曹志刚，MPSK信号判决预测载波相位估计，清华大学学报(自然科学版)》1997年第37卷
11. Yan Wang, Erchin Serpedin and Philippe Ciblat, Optimal Blind Carrier Recovery for M-PSK Burst Transmissions, IEEE TRANSACTIONS ON COMMUNICATIONS
12. Paden B E. A matched nonlinearity for pase estimation of a PSK modulated carrier. IEEE Trans Infrom, 1986, 32(3): 419-422.
13. Lin Jiaru and Li Jinling, Doppler Frequency Correction for (D)PSK in Mobile Radio Channel Training Center, Beijing University of Posts and
Telecommunications, Beijing 100088, P. R. China
14. Nele Noels, Heidi Steendam and Marc Moeneclaey, The true Cramer-Rao bound for estimating the carrier phase of a convolutionally encoded signal, Telecommunications and Information Processing (TELIN) department, Ghent University St-Pietersnieuwstraat 41, B-9000 Gent, Belgium
15. Michael P. Fitz, Further Results in the Fast Estimation of a Single Frequency
16. Fulvio Gini and Georgios B. Giannakis, Frequency Offset and Symbol Timing Recovery in Flat-Fading Channels: A Cyclostationary Approach
17. Nguyen Doan Vo and Tho Le-Ngoc, Fast Symbol Timing Recovery Techniques for Burst-mode Digital Demodulators, Dept. of ECE, McGill University, 3480 University Street, Montreal, Québec, Canada H3A 2A7
18. Jan-Jaap van de Beek, Estimation of Synchronization Parameters
19. Fulvio Gini and Georgios B. Giannakis, Frequency Offset and Symbol Timing Recovery in Flat-Fading Channels: A Cyclostationary Approach, IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 46, NO. 3, MARCH 1998
20．王士林 陆存乐 龚初光，现代数字调制技术，人民邮电出版社，1987年8月15045。总3360-无6407
21．姜建国 曹建中 高明玉，信号与系统分析基础，清华大学出版社 1994年2月ISBN-7-302-01415-9／TN。64
22. Sandeep Mukthavaram, Design and FPGA Implementation of an Adaptive Demodulator, B.S. E.E Osmania University, Hyderabad, India, 1997
23. Gardner F M. Hangup in phase lock loops[J]. IEEE Trans Comm, 1977, 25(10): 1210-1214.
24. W. C. Dam and D. P. Taylor, An adaptive maximum-likelihood receiverfor correlated Rayleigh-fading channel," IEEE Trans. Commun., vol. 42, pp. 2684-2692, Sept. 1994.
25. R. Mehlan, Y. Chen, and H. Meyr, A fully digital feedforward MSK demodulator with joint frequency offset and symbol timing estimation for burst mode mobile radio, IEEE Trans. Veh. Technol., vol. 42, pp. 434-443, Nov. 1993.