基于软件无线电的OFDM多载波传输技术研究
摘要
自从贝尔实验室提出了蜂窝组网理论之后，移动通信就进入了快速发展的时期。从第一代的模拟通信到第二代的数字通信，直至第三代的宽带通信和目前人们提出的所谓4G宽带多媒体系统，都是在向着个人通信的目标发展。移动通信的发展趋势是宽带多媒体通信，所采用的技术包括宽带CDMA、软件无线电(Software Radio)、智能天线(IntelligentAntennas)、正交频分复用(OFDM)和数字处理设备。
软件无线电和OFDM多载波技术均是未来移动通信发展中的极具吸引力的技术。本文将软件无线电技术和OFDM多载波调制技术相结合，提出了基于软件无线电平台的OFDM多载波传输系统方案。
第一章介绍了移动通信和软件无线电技术的发展历史和发展趋势、并简要介绍了OFDM多载波技术以及OFDM—CDMA系统的原理。
第二章介绍了中频数字化软件无线电的结构，并阐述了软件无线电的关键理论和软件无线电中的信号处理技术。
第三章主要研究了软件无线电架构的OFDM传输系统的发送机和接收机的框架结构，提出了OFDM传输系统的同步算法，并进行了matlab仿真。
第四章对OFDM系统的信道估计技术进行了比较全面的研究，并提出了软件无线电平台OFDM传输系统中的简单LMMSE信道估计器的设计方案。
第五章针对OFDM—CDMA系统进行了初步研究，在软件无线电平台上探讨三种OFDM—CDMA系统的实现。
Since cellular network technology was put forward by Bell lab,mobile communication has entered into a fast development period. From first analog generation to second digital generation,and up to wideband 3G and so-called 4G at present,mobile communication aims to personal communication. Future mobile communication will be wide-band multimedia communication. The adoptive technologies include wideband CDMA,Software Radio,Intelligent Antennas,OFDM (Orthogonal Frequency Division Multiplexing) and Digital Processing device.
OFDM and Software Radio are both the charming technology for future mobile communication. This paper mainly focuses on the combination of OFDM system with the Software Radio technology and presents OFDM transceiver scheme based on Software Radio platform.
Chapter 1 gives a brief description of the development of mobile communication and Software Radio technology,followed by expatiation on theory of OFDM and OFDM-CDMA.
Chapter 2 sets forth the structure of IF (Intermediate Frequency) digital Software Radio,the critical theory of Software Radio and the signal processing technique about it.
In chapter 3 we focus on the scheme design of OFDM transceiver based on Software Radio. The synchronous algorithms presented in such OFDM system are simulated via matlab.
In chapter 4 relatively all-around research on channel estimate is investigated and a simple LMMSE channel estimate scheme of OFDM system based on Software Radio is put up.
Chapter 5 focuses on the primary research of OFDM-CDMA system and discusses the realization of three type OFDM-CDMA systems based on the Software Radio platform.
软件无线电和OFDM多载波技术均是未来移动通信发展中的极具吸引力的技术。本文将软件无线电技术和OFDM多载波调制技术相结合，提出了基于软件无线电平台的OFDM多载波传输系统方案。
第一章介绍了移动通信和软件无线电技术的发展历史和发展趋势、并简要介绍了OFDM多载波技术以及OFDM—CDMA系统的原理。
第二章介绍了中频数字化软件无线电的结构，并阐述了软件无线电的关键理论和软件无线电中的信号处理技术。
第三章主要研究了软件无线电架构的OFDM传输系统的发送机和接收机的框架结构，提出了OFDM传输系统的同步算法，并进行了matlab仿真。
第四章对OFDM系统的信道估计技术进行了比较全面的研究，并提出了软件无线电平台OFDM传输系统中的简单LMMSE信道估计器的设计方案。
第五章针对OFDM—CDMA系统进行了初步研究，在软件无线电平台上探讨三种OFDM—CDMA系统的实现。
Since cellular network technology was put forward by Bell lab,mobile communication has entered into a fast development period. From first analog generation to second digital generation,and up to wideband 3G and so-called 4G at present,mobile communication aims to personal communication. Future mobile communication will be wide-band multimedia communication. The adoptive technologies include wideband CDMA,Software Radio,Intelligent Antennas,OFDM (Orthogonal Frequency Division Multiplexing) and Digital Processing device.
OFDM and Software Radio are both the charming technology for future mobile communication. This paper mainly focuses on the combination of OFDM system with the Software Radio technology and presents OFDM transceiver scheme based on Software Radio platform.
Chapter 1 gives a brief description of the development of mobile communication and Software Radio technology,followed by expatiation on theory of OFDM and OFDM-CDMA.
Chapter 2 sets forth the structure of IF (Intermediate Frequency) digital Software Radio,the critical theory of Software Radio and the signal processing technique about it.
In chapter 3 we focus on the scheme design of OFDM transceiver based on Software Radio. The synchronous algorithms presented in such OFDM system are simulated via matlab.
In chapter 4 relatively all-around research on channel estimate is investigated and a simple LMMSE channel estimate scheme of OFDM system based on Software Radio is put up.
Chapter 5 focuses on the primary research of OFDM-CDMA system and discusses the realization of three type OFDM-CDMA systems based on the Software Radio platform.
引文
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[2] Shinsuke Hara, Ramjee Prasad, "An Overview of Multi-Carrier CDMA",IEEE Communication Magazine, pp. 126-133. Dec. 1997
[3] Shan Tsung Wu, Kwang Cheng Chen, "Orthogonal frequency CDMA for broadband communications", Vehicular Technology Conference, 1999. VTC 1999-Fall. IEEE VTS 50th, Volume: 5, 1999 Page(s): 2890-2894 vol.5
[4] Li Y., Cimini, L.J., Jr., "Inter-channel interference of OFDM in mobile radio channels", Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, Volume 2,2000 Page(s): 706-710 vol.2
[5] Cimini, L., Jr.; "Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing", Communications, IEEE Transactions on [legacy, pre-1988], Volume: 33 Issue: 7, Jul 1985 Page(s): 665-675
[6] McNair, B.; Cimini, L.J., Jr.; Sollenberger, N.; "Performance of an experimental 384 kb/s 1900 MHz OFDM radio link in a wide-area high-mobility environment", Vehicular Technology Conference, 2000. IEEE VTS-Fall VTC 2000. 52nd, Volume: 3,2000 Page(s): 1397-1404 vol.3
[7] R.w. Schafer and L.R. Rabiner, "A digital signal processing approach to interpolation," Proc. IEEE, vol.61, pp.692-702, June 1973.
[8] F.M. Gardner, "Interpolation in digital modems-Part Ⅰ: Fundamentals," IEEE Trans. Commun., vol.41, pp.502-508
[9] Lars Erup, F.M. Gardner and Robert A., "Interpolation in digital modems-Part Ⅱ: Implementation and performance," IEEE Trans. Commun., vol.41, pp.998-1008, Jun.. 1993.
[10] Jun Wu; Qun Zhou; Cheng, K.K.M., "The adaptive algorithm of symbol timing and carrier phase estimation in OFDM systems", Communications, 2001. ICC 2001. IEEE International Conference on, Volume: 1,2001 ,Page(s): 156-160 vol. 1
[11] J.-J. van de Beek, M. Sandell, M. Isaksson, and P. B(?)rjesson, "Low complex frame synchronization in OFDM systems", Proc. ICUPC, Nov. 6-10, 1995, pp. 982-986.
[12] van de Beek, J.J.; Sandell, M.; B(?)rjesson, P.O., "ML estimation of time and frequency offset in OFDM systems", Signal Processing, IEEE Transactions on, Volume: 45 Issue: 7, July 1997 ,Page(s): 1800-1805
[13] Donghoon Lee, Kyungwhoon Cheun, "A New Symbol Timing Recovery Algorithm for OFDM Systems," IEEE Trans. Consum. Electron., vol. 43, no. 3, pp.767-775, Aug. 1997.
[14] Seongho Ha, Inho Hwang, and Hwangsoo Lee, "A Decision-Directed Frame Synchronization Algorithm for OFDM System," IEICE Trans. Commun., vol. E38-B, no. 7, pp.1563-1566, July 2000.
[15] Takahashi, K.; Saba, T.; "A novel symbol synchronization algorithm with reduced influence of ISI for OFDM systems",Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE, Volume: 1, 2001 ,Page(s): 524-528
[16] P. Moose, "A technique for orthogonal frequency division multiplexing frequency offset correction," IEEE Trans. Commun., vol. 42, pp. 2908-2914, Oct. 1994.
[17] H. Nogami; T. Nagashima; "A frequency and timing period acquisition technique for OFDM systems," Personal, Indoor and Mobile Radio Commun. (PIRMC), pp. 1010-1015, Sept. 27-29, 1995.
[18] F. Classen; H. Meyr; "Synchronization algorithms for an OFDM system for mobile communication," ITG-Fachtagung, pp. 105-113, Oct. 26-28, 1994.
[19] Timothy M. Schmidl; Donald C. Cox; "Robust frequency and timing synchronization for OFDM", IEEE Trsans. Commum, vol.45, No.12, pp.1613-1621, Dec. 1997.
[20] Meng-han Hsien; Che-ho Wei; "A frequency acquisition scheme for OFDM systems", PIMRC'96., Seventh IEEE International Symposium on,pp.843-847,vol.3,1996.
[21] Patel, S.; Cimini, L.S.; McNair, B.; "Comparison of frequency offset estimation techniques for burst OFDM", Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th, Volume: 2,2002 Page(s): 772-776
[22] Morrison, R.; Cimini, L.J.; Wilson, S.K; "On the use of a cyclic extension in OFDM",Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th, Volume: 2,2001 Page(s): 664-668
[23] DDC/DUC :ISL50216/ISL50217 Datasheet,Intersil inc. Apr.2001
[24] Schobinger, M, Meier, S.R., "DSP-based signal processing for OFDM transmission", Acoustics, Speech, and Signal Processing, 2001. Proceedings. 2001 IEEE International Conference on, Volume: 2,2001 Page(s): 1249-1252
[25] Wilson, S.K.; Khayata, R.E.; Cioffi, J.M.; "16 QAM modulation with orthogonal frequency division multiplexing in a Rayleigh-fading environment", Vehicular Technology Conference, 1994 IEEE 44th, 8-10 Jun 1994 Page(s): 1660-1664 vol.3
[26] Kobayashi, H.; "A novel coherent demodulation for M-QAM OFDM signal operating in the burst mode", Vehicular Technology Conference, 2000. IEEE VTS-Fall VTC 2000. 52nd, Volume: 3,2000 Page(s): 1387-1391 vol.3
[27] Speth, M.; Fechtel, S.A.; Fock, G.; Meyr, H.; "Optimum receiver design for wireless broad-band systems using OFDM—Part Ⅰ", Communications, IEEE Transactions on, Volume: 47 Issue: 11 ,Nov 1999 Page(s): 1668-1677
[28] Speth, M.; Fechtel, S.; Fock, G.; Meyr, H.; "Optimum receiver design for OFDM-based broadband transmission — Part Ⅱ: A case study", Communications, IEEE Transactions on, Volume: 49 Issue: 4, Apr 2001 Page(s): 571-578
[29] Li, Y.; Cimini,L.J.,Jr.; "Inter-channel interference of OFDM in mobile radio channels", Global Tele-communications Conference, 2000. GLOBECOM '00. IEEE, Volume: 2, 2000 Page(s): 706-710 vol.2
[30] Garcia, M.J.F.-G.; Zazo, S.; Paez-Borrallo, J.M., "Pilot patterns for channel estimation in OFDM", Electronics Letters, Volume: 36 Issue: 12,8 June 2000 Page(s): 1049-1050
[31] Che-Shen Yeh; Yinyi Lin; "Channel estimation using pilot tones in OFDM systems",Broadcasting, IEEE Transactions on, Volume: 45 Issue: 4 , Dec 1999 Page(s): 400-409
[32] Sarah Kate Wilson, R. Ellen Khayata, "16QAM Modulation with Orthogonal Frequency Division Multiplexing in a Rayleigh-Fading Environment", Proceedings of VTC'94, 3:1660-1664, June 1994
[33] Ralf Mehlan, "Combined Equalization/Decoding of Trellis Coded Modulation on Frequency-Selective Fading Channels", Proc. Tirrenia Int'1 Workshop on Digital Communication ,September 1991
[34] van de Beek, J.-J.; Edfors, O Sandell, M.; Wilson, S.K.; Borjesson, P.O., "On channel estimation in OFDM systems", Vehicular Technology Conference, 1995 IEEE 45th, Volume: 2, 1995 Page(s): 815-819 vol.2
[35] Cavers, J.K., "An analysis of pilot symbol assisted modulation for Rayleigh fading channels", Vehicular Technology, IEEE Transactions on, Volume: 40 Issue: 4, Nov. 1991 Page(s): 686-693
[36] Morelli, M.; Mengali, U, "A comparison of pilot-aided channel estimation methods for OFDM systems", Signal Processing, IEEE Transactions on, Volume: 49 Issue: 12, Dec 2001 Page(s): 3065-3073
[37] Chee Wall Wong; Choi Look Law; Yong Dang Guan, "Channel estimator for OFDM systems with 2-dimensional filtering in the transform domain", Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd, Volume: 1,2001 Page(s): 717-721
[38] Munster, M.; Hanzo, L., "Decision-directed channel estimation for multi-user OFDM environments ", Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd, Volume: 4,2001 Page(s): 2417-2420a
[39] Minjoon Rim; Jaemin Ahn; Yeon-Soo Kim; "Decision-directed channel estimation for M-QAM modulated OFDM systems", Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th, Volume: 4,2002 Page(s): 1742-1746
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