TS-NMT的窄带化及采样率降低方法的研究
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摘要
高质量、高速率一直是人们对通信技术的要求,然而,随着网络的普及和通信用户的增多,异常紧张的频带资源已经成为制约通信技术发展的一大障碍。如何压缩信号的频谱,提高频带利用率成为当今研究的热点。早些年提出OFDM以其优越的性能受到人们青睐,一直沿用至今,调制技术再没有突破性的进展。梁德群教授提出的时移非正交多重调制技术(TS-NMT)突破了正交性的限制。通过严格的理论分析及大量的仿真实验,证明了TS-NMT具有比现有的其它调制方法都高的频带利用率。
为了更加有效的利用频带资源,窄带、甚至超窄带技术相继被提出,给通信技术的发展提供了新的思路。因为信号的带宽与码元周期成反比,通过加长码元周期就可以压缩信号的带宽,对传统调制方式而言,加长码元周期传输率会随之降低,信号的功率也会加大。但是TS-NMT由于具有时移的特点,能够在信号功率基本不变的前提下,加长码元周期的同时增加子波数以保持传输率不变,从而大大提高频带利用率,我们称这种方法为窄带TS-NMT.本文通过理论推导证明了窄带TS-NMT高频带利用率的合理性。但是加长码元周期会加大信号的初相位延迟和运算的复杂度,为此我们提出了时域分段解调方法,可以有效的解决这两个问题。本文对窄带TS-NMT及分段解调法进行了Matlab仿真实现。
TS-NMT的时移非正交性,在带来了高效率的同时也带来了高采样率的代价。在实际系统中,采样率越高要求系统的硬件系统的处理能力越强,这就增加了系统的成本,不利于TS-NMT的推广,频域分段调制解调能够有效地降低TS-NMT的采样率。本文对频域分段法做了理论分析同时完成在5类线信道上的仿真实现。
High quality and high transmission speed have always been the request of people to the communications technology. However, along with the popularization of network and increase of correspondence users, spectrum resources are becoming more and more limited over time, it has already become a big barrier which restricts development of communication technology. How to compress the signal's frequency spectrum, and how to enhance the frequency spectrum using efficiency, have been the popular direction which is researched in communications now. Orthogonal Frequency Division Multiplexing (OFDM) continues to be used until now since it was proposed because of its superior performance. However, the modulation technology does not have the unprecedented progress again for years. Time Shift Non-orthogonal Multi-modulation Technology(TS-NMT for short) was proposed by Professor Liang Dequn can break through the orthogonal limit. Through the strict theoretical analysis and the massive simulation experiment, it is proved that TS-NMT has higher frequency efficiency compared to other modulation systems.
For the more effective using frequency resources, the narrow band technology and the ultra narrow band technology has been proposed one after another, which provided a new mentality to communications'development. Because the signal bandwidth is in inverse proportional to signal element period, through lengthen signal element period may compress signal bandwidth. To the tradition modulation system, lengthen signal element period will reduce transfer rate, and the signal power will be also enlarged at the same time. But TS-NMT, because of its time shift characteristic, can keep signal power basically constant, and maintains transfer rate invariable by increasing the wave number. Thus raises frequency efficiency greatly. This method is called narrow band TS-NMT. This article demonstrates rationality of narrow band TS-NMT' high frequency efficiency characteristic. However, new problems arise from lengthen signal element period.On the one hand it increases the signal's initial phase delay, on the other hand it enlarged the complexity of operation. Therefore we proposed the time-subsection demodulation method, this method can effective solute these two problems. Narrow band TS-NMT and time-subsection demodulation method are simulated by matlab.
While the time shift Non-orthogonal characteristic of TS-NMT brings its high efficiency, also bring its disadvantage of high sampling rate. In the actual system, higher sampling rate requests system's hardware handling ability stronger, that will increase system's cost, and disbennifit to the promotion of TS-NMT. The frequency division modulation and demodulation method demodulation r can reduce TS-NMT the sampling rate effectively. This article made the theoretical analysis to this method and complete simulation.
为了更加有效的利用频带资源,窄带、甚至超窄带技术相继被提出,给通信技术的发展提供了新的思路。因为信号的带宽与码元周期成反比,通过加长码元周期就可以压缩信号的带宽,对传统调制方式而言,加长码元周期传输率会随之降低,信号的功率也会加大。但是TS-NMT由于具有时移的特点,能够在信号功率基本不变的前提下,加长码元周期的同时增加子波数以保持传输率不变,从而大大提高频带利用率,我们称这种方法为窄带TS-NMT.本文通过理论推导证明了窄带TS-NMT高频带利用率的合理性。但是加长码元周期会加大信号的初相位延迟和运算的复杂度,为此我们提出了时域分段解调方法,可以有效的解决这两个问题。本文对窄带TS-NMT及分段解调法进行了Matlab仿真实现。
TS-NMT的时移非正交性,在带来了高效率的同时也带来了高采样率的代价。在实际系统中,采样率越高要求系统的硬件系统的处理能力越强,这就增加了系统的成本,不利于TS-NMT的推广,频域分段调制解调能够有效地降低TS-NMT的采样率。本文对频域分段法做了理论分析同时完成在5类线信道上的仿真实现。
High quality and high transmission speed have always been the request of people to the communications technology. However, along with the popularization of network and increase of correspondence users, spectrum resources are becoming more and more limited over time, it has already become a big barrier which restricts development of communication technology. How to compress the signal's frequency spectrum, and how to enhance the frequency spectrum using efficiency, have been the popular direction which is researched in communications now. Orthogonal Frequency Division Multiplexing (OFDM) continues to be used until now since it was proposed because of its superior performance. However, the modulation technology does not have the unprecedented progress again for years. Time Shift Non-orthogonal Multi-modulation Technology(TS-NMT for short) was proposed by Professor Liang Dequn can break through the orthogonal limit. Through the strict theoretical analysis and the massive simulation experiment, it is proved that TS-NMT has higher frequency efficiency compared to other modulation systems.
For the more effective using frequency resources, the narrow band technology and the ultra narrow band technology has been proposed one after another, which provided a new mentality to communications'development. Because the signal bandwidth is in inverse proportional to signal element period, through lengthen signal element period may compress signal bandwidth. To the tradition modulation system, lengthen signal element period will reduce transfer rate, and the signal power will be also enlarged at the same time. But TS-NMT, because of its time shift characteristic, can keep signal power basically constant, and maintains transfer rate invariable by increasing the wave number. Thus raises frequency efficiency greatly. This method is called narrow band TS-NMT. This article demonstrates rationality of narrow band TS-NMT' high frequency efficiency characteristic. However, new problems arise from lengthen signal element period.On the one hand it increases the signal's initial phase delay, on the other hand it enlarged the complexity of operation. Therefore we proposed the time-subsection demodulation method, this method can effective solute these two problems. Narrow band TS-NMT and time-subsection demodulation method are simulated by matlab.
While the time shift Non-orthogonal characteristic of TS-NMT brings its high efficiency, also bring its disadvantage of high sampling rate. In the actual system, higher sampling rate requests system's hardware handling ability stronger, that will increase system's cost, and disbennifit to the promotion of TS-NMT. The frequency division modulation and demodulation method demodulation r can reduce TS-NMT the sampling rate effectively. This article made the theoretical analysis to this method and complete simulation.
引文
[1]文元美,张树群,林家薇,黄爱华著.现代通信原理.北京：科学出版社,2005.
[2]Padmanand Warrier,Balaji Kumar著.任天恩泽,xDSL技术与体系结构.清华大学出版,2002.
[3](美) Sanjeev Mervana等《设计与实现基于DSL接入方案》.北京：人民邮电出版社,2002.
[4]赫尔德.无线数据传输网络：蓝牙,WAP和WLAN = Data over wireless networks BluetoothTM, WAP & Wireless LANs.北京：人民邮电出版社,2001.
[5]梁彦霞,杨家玮.无线通信中WiFi技术的发展与应用.电视技术.2006,03(7)：69-71.
[6]彭文根,王文博.下一代宽带无线通信系统：OFDM与WiMAX.北京：机械工业出版社,2007.
[7]彭林.第三代移动通信技术.北京：电子工业出版社,2003.
[8]Andrea Goldsimith著,杨鸿文,李卫东,郭文彬等译.无线通信.北京：人民邮电出版社,2007.
[9]Sandeep Chennakeshu, John B. Anderson. Error rates for Rayleigh fading multichannel reception of MPSK signals. IEEE Transactions on communications, Philadelphia,1995:3120-3129.
[10]Motohiko I, Morelos-Zaragoza RH, Fossorier MPC, Shu Lin, hideki I. Multilevel coded 16-QAM modulation with multistage decoding and unequal error protection, Conference Pecord. IEEE Global Telecommunications Conference, Australia,1998: 3548-3543.
[11]汪裕民.OFDM关键技术与应用.北京：机械工业出版社,2007.
[12]佟学俭,罗涛.OFDM移动通信技术原理与应用.北京：人民邮电出版社,2003.
[13]Goeckel D L, Ananthaswamy G. On the design of multidimentional signal sets for OFDM systems.2005,05(7):442-452.
[14]Cyrille S, Pierre S, Didier P. Analysis and design of OFDM/QAM and BFDM/QAM oversampled orthogonal and biorthogonal multicarrier modulations. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing-Proceedings, v4, Orlando,2002:4181.
[15]张启鹏,NMT物理样机的DSP算法及程序设计：(硕十学位论文).大连：大连海事大学,2008.
[16]袁擎柱,超窄带调制关键技术.科技论文,2008,065(10)：96-99.
[17]曹祁生.基于非正交思想的数字通信调制方法的研究：(博十学位论文).大连：大连海事大学,2008.
[18]钱甜甜,频时相移非正交多重调制(NMT/FTPS)的仿真研究：(硕十学位论文).大连：大连海事大学,2009.
[19]黄载禄,殷蔚华,黄本雄编著,通信原理.科学出版社,2007.
[20]Hiroshi Harada, Ramjee Prasad. Simulation and software radio for Mobile Communications. Artech house Publishers.2002.
[21]樊昌信,张甫翊,徐炳祥等.通信原理.北京：国防工业出版社,2001.
[22]Sklar B. Digital communications-fundamentals and applications, second edition China:Publishing House of Electronics Industry,2006.
[23]Cao Qisheng, Liang Dequn. Study on modulation techniques free of orthogonality restriction. Science in China, Series F,2007,08(06):889-869.
[24]樊昌信,曹丽娜.通信原理.北京：国防工业出版社,2006.
[25]曹祁生,梁德群.突破正交约束的调制技术研究.中国科学,2007,21(08)1066-1071.
[26]Liang Dequn. The Phase-offset overlapped wave Technique. Journal of Electronics, Mar.2003,20(02):122-127.
[27]刘向凤,非正交频分复用在无线信道上的仿真研究：(硕十学位论文).大连：大连海事大学,2008.
[28]杨孟青.兼有信道编码功能的非正交窄带调制方法的研究：(硕士学位论文).大连：大连海事大学,2009.
[29]杨金鸿.非正交频分复用在卫星通信信道上的仿真研究：(硕十学位论文).大连：大连海事大学,2008.
[30]周旻,王红星,吴龙刚.超窄带通信调制技术研究,中国电子科学研究院学报,2007,2(5)：518-526.
[31]徐利民,董建国.超窄带传输技术及其应用探讨.通信技术,2008,41(10)：23-25.
[32]吴乐南.超窄带高速通信进展.自然科学进展,2007,17(11)：1467-1472.
[33]H. R. Walker. VPSK and VMSK modulation transmit digital autio and video at 15Bit/Sec/Hz.IEEETrans on Broadcast Engineering,1997.
[34]H. R. Walker, A Facts About High Speed SCA Data Transmission@, Proceedings of the 1988 Broadcast Engineering Conference, Society of Broadcast Engineers, Denver Col.1988.
[35]曹志刚,钱亚生.现代通信原理.北京：清华大学出版社,1992.
[36]Michel C. Jeruchim, Philip Balaban, K. Sam Shanmugan著,周希元,陈卫东,毕见鑫译.通信系统仿真—建模、方法和技术.北京：国防工业出版社,2004.
[37]张志涌,徐彦琴等.MATLAB教程.北京：北京航空航天大学出版社,2001.
[38]Hiroshi Harada, Ramjee Prasad. Simulation and software radio for Mobile Communications. Artech house Publishers.2002.
[39]陈树新,邓妍,姚如编著.现代通信系统建模与仿真.西安：西安电子科技大学出版社,2007.
[40]李达全.“最后一公里”解决方案.无线电工程学报,2001,31(04)：33-35.
[41]龙腾,John M. Coiofi,刘峰编著.xDSL技术与应用.北京：电子工业出版社,2002.
[42]Walter J.Goralski著,姚永成译.ADSL/DSL技术与工程实践(第2版).北京：清华大学出版社,2003.
[43]张辉,曹丽娜著.通信原理.北京：科学出版社,2007.
[44]郭业才编著.通信信号分析于处理.合肥：合肥工业大学出版社,2009.
[45]李婵娟.NMT在ADSL线路上的工程仿真：(硕士学位论文).大连：大连海事大学,2007.
[46]陈舒瑜,NMT在5类线信道上的计算机仿真和物理线路实验：(硕士学位论文).大连：大连海事大学,2008.
[47]许少娟.基于移相重叠载波调制的DSL系统均衡器及波形分析与设计：(硕士学位论文).大连海事大学,2006.
[48]刘播雨.移相重叠码重要指标的研究：(硕士学位论文).大连：大连海事大学,2005.
[49]张贤达,保铮著.通信信号处理.北京：国防工业出版社,2000.
[50]冯玉泯编著,张树京主审.通信系统原理.北京：清华大学出版社,2003.
[51]程佩青.数字信号处理教程.北京：清华大学出版社,1998.
[52]Duan Min, Cao Qisheng. A new storage structure for Huffman tree and its application Proceeding of International Symposium on Test and Measurement.第七届国际测试技术研讨会,北京,2007：1555-1558.
[53]李国起,非正交频分复用在无线信道上的仿真研究：(硕士学位论文).大连：大连海事大
学,2008.
[54]曾重阳.NMT物理样机调制解调及控制模块的开发：(硕十学位论文).大连：大连海事大学,2008.
[2]Padmanand Warrier,Balaji Kumar著.任天恩泽,xDSL技术与体系结构.清华大学出版,2002.
[3](美) Sanjeev Mervana等《设计与实现基于DSL接入方案》.北京：人民邮电出版社,2002.
[4]赫尔德.无线数据传输网络：蓝牙,WAP和WLAN = Data over wireless networks BluetoothTM, WAP & Wireless LANs.北京：人民邮电出版社,2001.
[5]梁彦霞,杨家玮.无线通信中WiFi技术的发展与应用.电视技术.2006,03(7)：69-71.
[6]彭文根,王文博.下一代宽带无线通信系统：OFDM与WiMAX.北京：机械工业出版社,2007.
[7]彭林.第三代移动通信技术.北京：电子工业出版社,2003.
[8]Andrea Goldsimith著,杨鸿文,李卫东,郭文彬等译.无线通信.北京：人民邮电出版社,2007.
[9]Sandeep Chennakeshu, John B. Anderson. Error rates for Rayleigh fading multichannel reception of MPSK signals. IEEE Transactions on communications, Philadelphia,1995:3120-3129.
[10]Motohiko I, Morelos-Zaragoza RH, Fossorier MPC, Shu Lin, hideki I. Multilevel coded 16-QAM modulation with multistage decoding and unequal error protection, Conference Pecord. IEEE Global Telecommunications Conference, Australia,1998: 3548-3543.
[11]汪裕民.OFDM关键技术与应用.北京：机械工业出版社,2007.
[12]佟学俭,罗涛.OFDM移动通信技术原理与应用.北京：人民邮电出版社,2003.
[13]Goeckel D L, Ananthaswamy G. On the design of multidimentional signal sets for OFDM systems.2005,05(7):442-452.
[14]Cyrille S, Pierre S, Didier P. Analysis and design of OFDM/QAM and BFDM/QAM oversampled orthogonal and biorthogonal multicarrier modulations. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing-Proceedings, v4, Orlando,2002:4181.
[15]张启鹏,NMT物理样机的DSP算法及程序设计：(硕十学位论文).大连：大连海事大学,2008.
[16]袁擎柱,超窄带调制关键技术.科技论文,2008,065(10)：96-99.
[17]曹祁生.基于非正交思想的数字通信调制方法的研究：(博十学位论文).大连：大连海事大学,2008.
[18]钱甜甜,频时相移非正交多重调制(NMT/FTPS)的仿真研究：(硕十学位论文).大连：大连海事大学,2009.
[19]黄载禄,殷蔚华,黄本雄编著,通信原理.科学出版社,2007.
[20]Hiroshi Harada, Ramjee Prasad. Simulation and software radio for Mobile Communications. Artech house Publishers.2002.
[21]樊昌信,张甫翊,徐炳祥等.通信原理.北京：国防工业出版社,2001.
[22]Sklar B. Digital communications-fundamentals and applications, second edition China:Publishing House of Electronics Industry,2006.
[23]Cao Qisheng, Liang Dequn. Study on modulation techniques free of orthogonality restriction. Science in China, Series F,2007,08(06):889-869.
[24]樊昌信,曹丽娜.通信原理.北京：国防工业出版社,2006.
[25]曹祁生,梁德群.突破正交约束的调制技术研究.中国科学,2007,21(08)1066-1071.
[26]Liang Dequn. The Phase-offset overlapped wave Technique. Journal of Electronics, Mar.2003,20(02):122-127.
[27]刘向凤,非正交频分复用在无线信道上的仿真研究：(硕十学位论文).大连：大连海事大学,2008.
[28]杨孟青.兼有信道编码功能的非正交窄带调制方法的研究：(硕士学位论文).大连：大连海事大学,2009.
[29]杨金鸿.非正交频分复用在卫星通信信道上的仿真研究：(硕十学位论文).大连：大连海事大学,2008.
[30]周旻,王红星,吴龙刚.超窄带通信调制技术研究,中国电子科学研究院学报,2007,2(5)：518-526.
[31]徐利民,董建国.超窄带传输技术及其应用探讨.通信技术,2008,41(10)：23-25.
[32]吴乐南.超窄带高速通信进展.自然科学进展,2007,17(11)：1467-1472.
[33]H. R. Walker. VPSK and VMSK modulation transmit digital autio and video at 15Bit/Sec/Hz.IEEETrans on Broadcast Engineering,1997.
[34]H. R. Walker, A Facts About High Speed SCA Data Transmission@, Proceedings of the 1988 Broadcast Engineering Conference, Society of Broadcast Engineers, Denver Col.1988.
[35]曹志刚,钱亚生.现代通信原理.北京：清华大学出版社,1992.
[36]Michel C. Jeruchim, Philip Balaban, K. Sam Shanmugan著,周希元,陈卫东,毕见鑫译.通信系统仿真—建模、方法和技术.北京：国防工业出版社,2004.
[37]张志涌,徐彦琴等.MATLAB教程.北京：北京航空航天大学出版社,2001.
[38]Hiroshi Harada, Ramjee Prasad. Simulation and software radio for Mobile Communications. Artech house Publishers.2002.
[39]陈树新,邓妍,姚如编著.现代通信系统建模与仿真.西安：西安电子科技大学出版社,2007.
[40]李达全.“最后一公里”解决方案.无线电工程学报,2001,31(04)：33-35.
[41]龙腾,John M. Coiofi,刘峰编著.xDSL技术与应用.北京：电子工业出版社,2002.
[42]Walter J.Goralski著,姚永成译.ADSL/DSL技术与工程实践(第2版).北京：清华大学出版社,2003.
[43]张辉,曹丽娜著.通信原理.北京：科学出版社,2007.
[44]郭业才编著.通信信号分析于处理.合肥：合肥工业大学出版社,2009.
[45]李婵娟.NMT在ADSL线路上的工程仿真：(硕士学位论文).大连：大连海事大学,2007.
[46]陈舒瑜,NMT在5类线信道上的计算机仿真和物理线路实验：(硕士学位论文).大连：大连海事大学,2008.
[47]许少娟.基于移相重叠载波调制的DSL系统均衡器及波形分析与设计：(硕士学位论文).大连海事大学,2006.
[48]刘播雨.移相重叠码重要指标的研究：(硕士学位论文).大连：大连海事大学,2005.
[49]张贤达,保铮著.通信信号处理.北京：国防工业出版社,2000.
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