基于MIMO-OFDM系统的多种编译码方法的研究
|
摘要
MIMO技术可以在不牺牲带宽和不增加发射功率的情况下成倍地提高信道容量。正交频分复用(OFDM)是一种多载波传输技术,可以有效地抗频率选择性衰落和窄带干扰。而MIMO-OFDM技术集MIMO与OFDM两者的优点于一身,成为当今学术界与工业界研究的热点,并且在WIMAX和LTE协议中都把MIMO-OFDM技术作为物理层的关键技术。
本文首先对MIMO技术以及OFDM技术的基本原理进行了简要地介绍,并且概述了LTE协议中物理层应用MIMO-OFDM技术的实例。然后分析了无线信道的特征和模型,并对MIMO系统的多种信道容量进行了分析和比较;其次介绍了空时编码的基本原理,分析了空时编码的性能,对MIMO-OFDM系统进行了分类和性能分析,然后提出了VBLAST-OFDM技术的多种改进译码算法,并进行了性能分析,接着详细分析了Turbo-BLAST-OFDM系统的改进迭代译码算法,并与传统的译码算法进行了比较;最后为了更灵活的应用多种空时编码的优点,根据不同的条件选用不同编码组合方式,提高系统的综合性能,提出了MIMO-OFDM空时频域混合编码的概念,并对系统的分类、原理和结构做了详细地分析和比较。
Without increasing bandwidth or transmitting power, MIMO technique can improve channel capacity greatly. The orthogonal-frequency-division-multiplexing (OFDM) system is a multi-carrier system which can be used to combat frequency selective fading and narrowband interference. MIMO-OFDM technique takes the advantages of both MIMO technique and OFDM technique, and becomes the hotpot in the study and industry field. MIMO-OFDM technique has been used in both WIMAX and LTE protocols as the key technique of the PHY Layer.
Firstly a brief introduction on the key techniques and the principles of MIMO and OFDM techniques are given in this thesis. Subsequently, a brief summary about MIMO-OFDM used in LTE protocol is offered. Then the characters and models of the wireless channel are analyzed. Also, the capacity of the MIMO channel is studied and compared. Secondly, the algorithms of space-time code are studied, and the methods of OFDM techniques combined with the space-time code are assorted and their characters are compared and analyzed. Then, a lot of ameliorative algorithms about VBLAST-OFDM are advanced and analyzed. Also the ameliorative algorithm of Turbo-BLAST-OFDM system is advanced and analyzed in detail and compared with traditional principle. Finally in order to manage the space-time coding more freely and improve the compositive performance of system by choosing different combined coding according to different conditions, the conception of MIMO-OFDM space-time-frequency area mixed coding is advanced. Then its sorts, principles and structures are introduced and analyzed in detail. .
本文首先对MIMO技术以及OFDM技术的基本原理进行了简要地介绍,并且概述了LTE协议中物理层应用MIMO-OFDM技术的实例。然后分析了无线信道的特征和模型,并对MIMO系统的多种信道容量进行了分析和比较;其次介绍了空时编码的基本原理,分析了空时编码的性能,对MIMO-OFDM系统进行了分类和性能分析,然后提出了VBLAST-OFDM技术的多种改进译码算法,并进行了性能分析,接着详细分析了Turbo-BLAST-OFDM系统的改进迭代译码算法,并与传统的译码算法进行了比较;最后为了更灵活的应用多种空时编码的优点,根据不同的条件选用不同编码组合方式,提高系统的综合性能,提出了MIMO-OFDM空时频域混合编码的概念,并对系统的分类、原理和结构做了详细地分析和比较。
Without increasing bandwidth or transmitting power, MIMO technique can improve channel capacity greatly. The orthogonal-frequency-division-multiplexing (OFDM) system is a multi-carrier system which can be used to combat frequency selective fading and narrowband interference. MIMO-OFDM technique takes the advantages of both MIMO technique and OFDM technique, and becomes the hotpot in the study and industry field. MIMO-OFDM technique has been used in both WIMAX and LTE protocols as the key technique of the PHY Layer.
Firstly a brief introduction on the key techniques and the principles of MIMO and OFDM techniques are given in this thesis. Subsequently, a brief summary about MIMO-OFDM used in LTE protocol is offered. Then the characters and models of the wireless channel are analyzed. Also, the capacity of the MIMO channel is studied and compared. Secondly, the algorithms of space-time code are studied, and the methods of OFDM techniques combined with the space-time code are assorted and their characters are compared and analyzed. Then, a lot of ameliorative algorithms about VBLAST-OFDM are advanced and analyzed. Also the ameliorative algorithm of Turbo-BLAST-OFDM system is advanced and analyzed in detail and compared with traditional principle. Finally in order to manage the space-time coding more freely and improve the compositive performance of system by choosing different combined coding according to different conditions, the conception of MIMO-OFDM space-time-frequency area mixed coding is advanced. Then its sorts, principles and structures are introduced and analyzed in detail. .
引文
[1]汪裕民. OFDM关键技术与应用.第1版.北京:机械工业出版社,2007. 10-30.
[2]赵慧. 3G长期演进技术与系统设计.第1版.北京:电子工业出版社,2007. 26-56.
[3]张克平. LTE-B3G/4G移动通信系统无线技术.第1版.北京:电子工业出版社,2008.
[4]尹长川.多载波宽带无线通信技术.第1版.北京:北京邮电大学出版社,2004. 65-78.
[5]任品毅.空时编码的理论与实践.第1版.西安:西安交通大学出版社,2007. 36-68.
[6] S. L. Loyka . Channel capacity of MIMO architecture using the exponential correlation matrix. IEEE Communi. 2001, Sept, 5(5). 369-371.
[7] C-N Chuah, G.J Foschini . Channel capacity growth of multi-element arrays in door and outdoor wireless channels. Proc of IEEE WCNC 2000[C]. 2000, Oct, 12(5). 232-265.
[8] David Gesbert, Mansoor shafi, Da-shan shiu . From Theory to practice: An Overview of MIMO Space-Time Coded Wireless Systems. IEEE Journal on selected Areas in communication. 2003, April, 21(2). 210-222.
[9] A. F. Naguib and R. Calderbank . Space-time coding and signal processing for high data rate wireless communications. IEEE Signal Processing Magazine. 2000, Mar, 17(8). 76-92.
[10] S.B Weinstein, P. M Ebert . Data transmission by frequency division multiplexing using the discrete Fourier transforms[J]. IEEE Transition On Communication Technology, 1971, 19(3). 628-634.
[11] Bevan D, Tanner R . Performance Comparison of Space-Time coding Techniques. Electron. Lett. 1999, Sept. 30(5). 1707-1708.
[12] Vahid Tarokh, H. Jafarkhani, AR Calferbank. Space-Time block codes from orthogonal designs[J]. IEEE Trans on IT, 1999, IT245(5). 1456-1467.
[13] Hochwald B M I, Marzetta T L M. Unitary Space-Time Modulation for Multiple- Antenna Communications in Rayleigh Flat Fading. IEEE Trans. Inform. Theory, 2000, 46(6). 543-564.
[14] V Tarokh, N. S V Seshadri, AR Calderbank . Space-Time codes for high data rate wireless communication. Performance criterion and code construction[J]. IEEE Trans. Inform Theory. 1998, 44(7). 744-765.
[15] H. Bolcskei, A. J. Paulraj . Space-frequency codes for broadband fading channels. In Proc. IEEE ISIT-2001, (Washington, DC). 2001, June, 50(1). 219-228.
[16] G.. D Golden, G.J Foschini . Detection algorithm and initial laboratory results using V-BLAST, Space-Time communication architecture[J]. Electronics Letters. 1999, 35(1). 14-16.
[17] Wong Knan Wai, Chi-Ying Tsui, Roger S Cheng . A low complexity architecture of the V-BLAST system[A]. WCNC 2000 IEEE[C]. Chicago, USA. 2000. 32(5). 310-314.
[18]陶小峰. V-BLAST的次优译码.电子学报. 2003, 31.703-706.
[19]刘谦雷.用于MIMO-OFDM系统信号检测的简化VBLAST方法.东南大学.电路与系统学报. 2006, 4, 11. 123-125.
[20]王新梅.纠错码-原理与方法.第3版.西安:西安电子科技大学出版社,2001. 505-533.
[21]吴伟陵.信道编码的Turbo码及其性能分析.电子学报. 1998, 28. 35-40.
[22] Heegarf Edward . The Turbo coding. Boston. Kluwer Academic Publisher. 1999.10.1, 1(1). 121-145.
[23] Elkhazin A, Plataniotis K, Pasupathy S . Group MAP BLAST Detector. Proc. ICASSP’04. 2004, May 17(4). 785-788.
[24]钟秋萍. MIMO-OFDM多载波移动通信系统中的信道编码及硬件实现.东南大学硕士学位论文. 2006, 4.
[25] Herzog R . Interference Cancellation for a High Data Rate User in coded CDMA systems. IEEE ICC, Atlanta, 1998.
[26]张琦. MIMO系统中空时技术的研究.西安电子科技大学硕士学位论文. 2006, 1. 50-58.
[27]李小玮.基于MIMO的垂直分层空时码检测算法.华南理工大学.电讯技术. 2005, 3. 55-58.
[28] Schlegel C, G.. Grant A . Differential Space-Time Turbo Codes. IEEE Trans. Inform. Theory. 2003, 49. 2298-2306.
[29] W. Choi, K. Cheong, and J. M. Cioffi . Iterative soft interference cancellation for multiple antenna system. In Proc. Wireless Communications and Network Conf. 2000, 2(5). 304-309.
[30]朱瑜. MIMO-OFDM系统中分层结构的空时分组码.西安电子科技大学.山西电子技术. 2007, 1(1). 51-53.
[31] Young-Doo Kim, Jihoon Choi, Jae-Young Ahn, Lee Y H . Adaptive Modulation for MIMO Systems with V-BLAST Detection.. 2003, April, 22(2). 1074-1078.
[2]赵慧. 3G长期演进技术与系统设计.第1版.北京:电子工业出版社,2007. 26-56.
[3]张克平. LTE-B3G/4G移动通信系统无线技术.第1版.北京:电子工业出版社,2008.
[4]尹长川.多载波宽带无线通信技术.第1版.北京:北京邮电大学出版社,2004. 65-78.
[5]任品毅.空时编码的理论与实践.第1版.西安:西安交通大学出版社,2007. 36-68.
[6] S. L. Loyka . Channel capacity of MIMO architecture using the exponential correlation matrix. IEEE Communi. 2001, Sept, 5(5). 369-371.
[7] C-N Chuah, G.J Foschini . Channel capacity growth of multi-element arrays in door and outdoor wireless channels. Proc of IEEE WCNC 2000[C]. 2000, Oct, 12(5). 232-265.
[8] David Gesbert, Mansoor shafi, Da-shan shiu . From Theory to practice: An Overview of MIMO Space-Time Coded Wireless Systems. IEEE Journal on selected Areas in communication. 2003, April, 21(2). 210-222.
[9] A. F. Naguib and R. Calderbank . Space-time coding and signal processing for high data rate wireless communications. IEEE Signal Processing Magazine. 2000, Mar, 17(8). 76-92.
[10] S.B Weinstein, P. M Ebert . Data transmission by frequency division multiplexing using the discrete Fourier transforms[J]. IEEE Transition On Communication Technology, 1971, 19(3). 628-634.
[11] Bevan D, Tanner R . Performance Comparison of Space-Time coding Techniques. Electron. Lett. 1999, Sept. 30(5). 1707-1708.
[12] Vahid Tarokh, H. Jafarkhani, AR Calferbank. Space-Time block codes from orthogonal designs[J]. IEEE Trans on IT, 1999, IT245(5). 1456-1467.
[13] Hochwald B M I, Marzetta T L M. Unitary Space-Time Modulation for Multiple- Antenna Communications in Rayleigh Flat Fading. IEEE Trans. Inform. Theory, 2000, 46(6). 543-564.
[14] V Tarokh, N. S V Seshadri, AR Calderbank . Space-Time codes for high data rate wireless communication. Performance criterion and code construction[J]. IEEE Trans. Inform Theory. 1998, 44(7). 744-765.
[15] H. Bolcskei, A. J. Paulraj . Space-frequency codes for broadband fading channels. In Proc. IEEE ISIT-2001, (Washington, DC). 2001, June, 50(1). 219-228.
[16] G.. D Golden, G.J Foschini . Detection algorithm and initial laboratory results using V-BLAST, Space-Time communication architecture[J]. Electronics Letters. 1999, 35(1). 14-16.
[17] Wong Knan Wai, Chi-Ying Tsui, Roger S Cheng . A low complexity architecture of the V-BLAST system[A]. WCNC 2000 IEEE[C]. Chicago, USA. 2000. 32(5). 310-314.
[18]陶小峰. V-BLAST的次优译码.电子学报. 2003, 31.703-706.
[19]刘谦雷.用于MIMO-OFDM系统信号检测的简化VBLAST方法.东南大学.电路与系统学报. 2006, 4, 11. 123-125.
[20]王新梅.纠错码-原理与方法.第3版.西安:西安电子科技大学出版社,2001. 505-533.
[21]吴伟陵.信道编码的Turbo码及其性能分析.电子学报. 1998, 28. 35-40.
[22] Heegarf Edward . The Turbo coding. Boston. Kluwer Academic Publisher. 1999.10.1, 1(1). 121-145.
[23] Elkhazin A, Plataniotis K, Pasupathy S . Group MAP BLAST Detector. Proc. ICASSP’04. 2004, May 17(4). 785-788.
[24]钟秋萍. MIMO-OFDM多载波移动通信系统中的信道编码及硬件实现.东南大学硕士学位论文. 2006, 4.
[25] Herzog R . Interference Cancellation for a High Data Rate User in coded CDMA systems. IEEE ICC, Atlanta, 1998.
[26]张琦. MIMO系统中空时技术的研究.西安电子科技大学硕士学位论文. 2006, 1. 50-58.
[27]李小玮.基于MIMO的垂直分层空时码检测算法.华南理工大学.电讯技术. 2005, 3. 55-58.
[28] Schlegel C, G.. Grant A . Differential Space-Time Turbo Codes. IEEE Trans. Inform. Theory. 2003, 49. 2298-2306.
[29] W. Choi, K. Cheong, and J. M. Cioffi . Iterative soft interference cancellation for multiple antenna system. In Proc. Wireless Communications and Network Conf. 2000, 2(5). 304-309.
[30]朱瑜. MIMO-OFDM系统中分层结构的空时分组码.西安电子科技大学.山西电子技术. 2007, 1(1). 51-53.
[31] Young-Doo Kim, Jihoon Choi, Jae-Young Ahn, Lee Y H . Adaptive Modulation for MIMO Systems with V-BLAST Detection.. 2003, April, 22(2). 1074-1078.