移动通信中OFDM技术的研究
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摘要
本文主要研究正交频分复用(OFDM)及其抗多径衰落的一些技术，并利用计算机进行仿真。在对移动信道进行详细的理论分析和研究的基础上，首先给出了OFDM的基本原理，并简要介绍了克服多径衰落的一些措施。然后具体讨论了OFDM的几种关键技术：1．信道编码与OFDM的结合(COFDM)，增强系统进一步提高消除多径影响的能力；2．分集技术，重点介绍了一种空间频率联合分集接收技术，它能够大幅度降低计算量；3．比特与信道的自适应分配法，是一种有效的动态分配方法。利用Systemview软件进行模拟多径信道下OFDM系统性能仿真，并探讨了仿真过程中的一些问题，最后搭建了OFDM基带仿真系统，并利用TMS320C54DSP芯片，进行了OFDM硬件嵌入式仿真。
This paper concentrates on the orthogonal frequency division multiplexing(OFDM) technique and some techniques to resist multipath fading. It also simulates by computer. Based on detailed theoretical analysis and research of the mobile channel, Firstly it introduces the basis principle of OFDM and concisely present some measures to overcome multipath fading, and then discusses several key techniques of OFDM concretely: 1. OFDM combined with channel coding(COFDM) can enhance the ability to lower the effect of multipath fading. 2. A joint frequency and space diversity scheme is presented which can reduce computational cost. 3. An adaptive bit, power and subcarrier allocation is presented. When the channel changes rapidly, this proposed dynamic algorithm is efficient. Other than above, this paper also studies the character of OFDM under multipath fading and gives the baseband computer simulation by Systemview. At last, it performs OFDM DSP hardware plug-in simulation.
This paper concentrates on the orthogonal frequency division multiplexing(OFDM) technique and some techniques to resist multipath fading. It also simulates by computer. Based on detailed theoretical analysis and research of the mobile channel, Firstly it introduces the basis principle of OFDM and concisely present some measures to overcome multipath fading, and then discusses several key techniques of OFDM concretely: 1. OFDM combined with channel coding(COFDM) can enhance the ability to lower the effect of multipath fading. 2. A joint frequency and space diversity scheme is presented which can reduce computational cost. 3. An adaptive bit, power and subcarrier allocation is presented. When the channel changes rapidly, this proposed dynamic algorithm is efficient. Other than above, this paper also studies the character of OFDM under multipath fading and gives the baseband computer simulation by Systemview. At last, it performs OFDM DSP hardware plug-in simulation.
引文
1 John G.Proakis．数字通信．第三版．北京：电子工业出版社，2001
2 沈振元，聂志泉，赵雪荷．通信系统原理．西安：西安电子科技大学出版社，1993
3 王世一．数字信号处理．北京：北京理工大学出版社，1997
4 彭启综．TMS320C54x实用教程．成都：电子科技大学出版社，2000
5 吴伟陵．移动通信中的关键技术．北京：北京邮电大学出版社．2000
6 刘元安．宽带无线接入和无线局域网．北京：北京邮电大学出版社，2000
7 李东生．信号与电子系统原理及EDA仿真．合肥：中国科学技术大学出版社，2000
8 青松，程岱松，武建华．数字通信系统的Systemview仿真与分析．北京：北京航空航天大学出版社，2001
9 梅剑平，全子一．正交频分复用(OFDM)及其在高速数字通信中的应用．电信科学．1995(4)
10 王电平，魏激波，董兆鑫．多载波调制(MCM)系统及其性能分析．重庆邮电学院学报．1998(1)
11 李引新，赵姚同．正交频分多路(OFDM)的实现方式及性能分析．电讯技术．1998(6)
12 赵荣黎．无线移动信道OFDM数据传输方式．北方交通大学学报．1995(4)
13 赵刚，徐玉滨，张乃通．多载波CDMA．移动通信．1999(1)
14 傅延增，张海林，王育民．正交频分复用中的符号同步技术．西安电子科技大学学报．2000(3)
15 潘武，刘序明，许希斌，姚彦．正交频分复用技术在宽带通信中的应用．移动通信技术．1997(3)
16 李斯伟，张建超．正交频分复用(OFDM)的原理及应用．中国民航学院学报．1999(5)
17 赵亚红，李伟华，吴伟陵．正交多载波调制(OFDM)技术及其应用．电讯技术．2001(1)
18 叶秉埅，阎忠平．正交频分复用数字调制技术．现代电力．2000(4)
19 郭坚．正交频分复用技术及其在CDMA中的应用．数字通信．1998(4)
20 王匡，姚庆栋，秦二龙．正交频分复用技术的应用．广播与电视技术．1995(12)
21 曹雪虹，毕厚杰．离散多载波调制中信道的非均匀分割．南京邮电学院学报．2000(2)
22 张兆扬，高磊．COFDM原理及在数字电视传输中的应用．电视技术．1995(10)
23 孙世昕．数字声音广播的关键技术-COFDM．通信与广播电视．1997(1)
24 梅剑平，全子一．一种新的HDTV传输技术．北京邮电大学学报．1995(3)
25 Weinstein S.B. and Ebert P.M. Data transmission by Frequency Division Multiplexing Using the Discrete Fourier Transform. IEEE Trans. Common. 1971:628-634
26 Haiying Wang, Jean belzile, Charles L.Despins. 64-QAM OFDM with TCM coding and waveform shaping in a time-selective rician fading channel. IEEE Trans. Commun. 2000: 257-261
27 Sai Kit Lai, Roger S.Cheng, Khaled Ben Letaief, Chi Ying Tsui. Adaptive tracking of optimal bit and power allocation for OFDM systems in time-varying channels. IEEE Trans. Commun. 1999: 776-780
28 Cheong Yui Wong, Roger S.Cheng. Multiuser OFDM with Adaptive Subcarrier, Bit, and Power Allocation, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS. 1999(10) : 1747-1758
29 S.Bertazzoni, G.C.Cardarilli, M.Iannuccelli, M.Salmeri, A.Sasano, O.Simonelli. 16-point high speed FFT for OFDM modulation. IEEE Trans. Commun. 1998: 210-212
30 Minoru Okada, Atsumori Hashizume, Shozo Komaki. A joint frequency and space diversity scheme for OFDM. IEEE Trans. Commun. 1999: 2939-2944
31 Nobuaki Mochizuki, Yoichi Matsumoto. A high performance frequency and timing synchronization technique for OFDM. IEEE Trans. Commun. 1998: 3443． 3449
32 Ramjee Prasad, Shinsuke Kara. An overview of multi-carrier CDMA. IEEE Trans. Commun. 1996: 107-115
33 Xiang Gui, Tung Sang Ng. Performance of Asynchronous Orthogonal Multicarrier CDMA System in Frequency Selective Fading Channel. IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS. 1999(7) : 1084-1092
34 William Y.Zou, Yiyan Wu. COFDM an overview. IEEE Transaction on Broadcasting. 1995(1) : 1-8
35 Weon-cheol Lee, Hyung-Mo Park, Jong-Seok Park. Viterbi decoding method using channel state information in COFDM system. IEEE Trans. Commun. 1999:533-538
36 Yun Hee Kim, Iickho Song. Performance analysis of a coded OFDM system in time-varying multipath Rayleigh fading channels. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY. 1999(5) : 1610-1616
37 Tadahiro Makabe, Soichi Watanabe. Adaptive forward subchannel control scheme of OFDM mobile communication system. IEEE Trans. Commun. 1999: 2438-2442
2 沈振元，聂志泉，赵雪荷．通信系统原理．西安：西安电子科技大学出版社，1993
3 王世一．数字信号处理．北京：北京理工大学出版社，1997
4 彭启综．TMS320C54x实用教程．成都：电子科技大学出版社，2000
5 吴伟陵．移动通信中的关键技术．北京：北京邮电大学出版社．2000
6 刘元安．宽带无线接入和无线局域网．北京：北京邮电大学出版社，2000
7 李东生．信号与电子系统原理及EDA仿真．合肥：中国科学技术大学出版社，2000
8 青松，程岱松，武建华．数字通信系统的Systemview仿真与分析．北京：北京航空航天大学出版社，2001
9 梅剑平，全子一．正交频分复用(OFDM)及其在高速数字通信中的应用．电信科学．1995(4)
10 王电平，魏激波，董兆鑫．多载波调制(MCM)系统及其性能分析．重庆邮电学院学报．1998(1)
11 李引新，赵姚同．正交频分多路(OFDM)的实现方式及性能分析．电讯技术．1998(6)
12 赵荣黎．无线移动信道OFDM数据传输方式．北方交通大学学报．1995(4)
13 赵刚，徐玉滨，张乃通．多载波CDMA．移动通信．1999(1)
14 傅延增，张海林，王育民．正交频分复用中的符号同步技术．西安电子科技大学学报．2000(3)
15 潘武，刘序明，许希斌，姚彦．正交频分复用技术在宽带通信中的应用．移动通信技术．1997(3)
16 李斯伟，张建超．正交频分复用(OFDM)的原理及应用．中国民航学院学报．1999(5)
17 赵亚红，李伟华，吴伟陵．正交多载波调制(OFDM)技术及其应用．电讯技术．2001(1)
18 叶秉埅，阎忠平．正交频分复用数字调制技术．现代电力．2000(4)
19 郭坚．正交频分复用技术及其在CDMA中的应用．数字通信．1998(4)
20 王匡，姚庆栋，秦二龙．正交频分复用技术的应用．广播与电视技术．1995(12)
21 曹雪虹，毕厚杰．离散多载波调制中信道的非均匀分割．南京邮电学院学报．2000(2)
22 张兆扬，高磊．COFDM原理及在数字电视传输中的应用．电视技术．1995(10)
23 孙世昕．数字声音广播的关键技术-COFDM．通信与广播电视．1997(1)
24 梅剑平，全子一．一种新的HDTV传输技术．北京邮电大学学报．1995(3)
25 Weinstein S.B. and Ebert P.M. Data transmission by Frequency Division Multiplexing Using the Discrete Fourier Transform. IEEE Trans. Common. 1971:628-634
26 Haiying Wang, Jean belzile, Charles L.Despins. 64-QAM OFDM with TCM coding and waveform shaping in a time-selective rician fading channel. IEEE Trans. Commun. 2000: 257-261
27 Sai Kit Lai, Roger S.Cheng, Khaled Ben Letaief, Chi Ying Tsui. Adaptive tracking of optimal bit and power allocation for OFDM systems in time-varying channels. IEEE Trans. Commun. 1999: 776-780
28 Cheong Yui Wong, Roger S.Cheng. Multiuser OFDM with Adaptive Subcarrier, Bit, and Power Allocation, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS. 1999(10) : 1747-1758
29 S.Bertazzoni, G.C.Cardarilli, M.Iannuccelli, M.Salmeri, A.Sasano, O.Simonelli. 16-point high speed FFT for OFDM modulation. IEEE Trans. Commun. 1998: 210-212
30 Minoru Okada, Atsumori Hashizume, Shozo Komaki. A joint frequency and space diversity scheme for OFDM. IEEE Trans. Commun. 1999: 2939-2944
31 Nobuaki Mochizuki, Yoichi Matsumoto. A high performance frequency and timing synchronization technique for OFDM. IEEE Trans. Commun. 1998: 3443． 3449
32 Ramjee Prasad, Shinsuke Kara. An overview of multi-carrier CDMA. IEEE Trans. Commun. 1996: 107-115
33 Xiang Gui, Tung Sang Ng. Performance of Asynchronous Orthogonal Multicarrier CDMA System in Frequency Selective Fading Channel. IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS. 1999(7) : 1084-1092
34 William Y.Zou, Yiyan Wu. COFDM an overview. IEEE Transaction on Broadcasting. 1995(1) : 1-8
35 Weon-cheol Lee, Hyung-Mo Park, Jong-Seok Park. Viterbi decoding method using channel state information in COFDM system. IEEE Trans. Commun. 1999:533-538
36 Yun Hee Kim, Iickho Song. Performance analysis of a coded OFDM system in time-varying multipath Rayleigh fading channels. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY. 1999(5) : 1610-1616
37 Tadahiro Makabe, Soichi Watanabe. Adaptive forward subchannel control scheme of OFDM mobile communication system. IEEE Trans. Commun. 1999: 2438-2442