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1、数字调制解调技术 英文文献 Technology of digital modulation and demodulation plays a important role in digital communication system, the combination of digital communication technology and FPGA is a certainly trend . With the development of software radio, the requirement for technology of modulation and demodul

2、ation is higher and higher. This paper starts with studying digital modulation and demodulation theory at first, and analyses basic principle of three kinds of important modulation and demodulation way ( FSK, MSK, GMSK ).The Rohde &Schwarz SME03, Signal Generator, provides AM modulation and External

3、 FSK digital modulation required for the development and testing of digital mobile radio receivers.The application of PWM in digital modulation and demodulation for analog communication signals in several modulation modes Research results prove that the design of digital IF modulator and demodulator

4、 of Software Radio appeases the capability and requirement of Software Radio.A transfusion speed monitor system is designed based on infrared technology with modulation and demodulation.Its the combination of modulator and demodulator.Time synchronization that is key technology of digital demodulati

5、on is cc allied by software.The paper provides the design of hardware of digital IF modulator and demodulator of Software Radio which includes Digital Signal Processor、Micro Control Unit and AD/DA convertor etc.Digital Down/Up Converter(DDC/DUC), modulation and demodulation are discussed in the diss

6、ertation as some essencial parts of SDR platform. Two Way Automatic Communication System(TWACS) is a new valuable communication technology for distribution networks,which has special of modulation and demodulation. In this paper, we study the OFDM technology based on 802.16a, realize the baseband mo

7、dulation and demodulation by using TMS320C6201, and optimize the software module. The paper introduces the principle of QPSK modulation and demodulation, the circuit are also be realized based on FPGA.With the improvement of the technology, especially in the fields such as computer technology , data

8、 coding and compress , digital modulation and VLSI, the world electronic information industry enter into the digital era. First, the features of fax communication and the mode of modulation and demodulation are described.In automatic classification of digital modulation signal,computing envelope var

9、iance after difference has important meaning to distinguish PSK and FSK signal.The science and technology of space flight.The effect on modulation and demodulation of QPSK via carrier phase noise can not be ignored, and it is difficult to analyze. Digital modulation error parameters, such as error v

10、ector magnitude EVM, is important in test and measurement of information system. This paper introduces the technology research progress in the metrology of digital modulation error parameters. First, we point out the basic problems existing in the field, which is about traceability and parameter ran

11、ge of calibration, and describe the relevant research, such as the thinking and technology of the RF waveform metrology. Then, we highlight the research progress of our team: 1). The metrology method and system for digital demodulation error parameter based on CW combination, which fits BPSK, QPSK,

12、8PSK, 16QAM, 64QAM modulation: this method can achieve traceability and error setting ability in a wide range, when standard EvmRms is 1.585%, the expanded uncertainty (k=2) is 0.009%. 2). The metrology method and system for digitaldemodulation error parameter based on analog AM or PM. 3). The metro

13、logy method and system for digital demodulation error parameter based on IQ gain imbalance and phase imbalance. 4). The metrology method and system for digital demodulation error parameter based on analog PM in the aspect of GMSK and FSK modulation. 5). The metrology method and system for digital de

14、modulation error parameter based on Baseband waveform design. Based on these methods, our proposal are given as follows: first, establish public metrology standard for digital modulation error parameters; second, develop a new type of instrument vector signal analyzer calibrator. In this paper, we p

15、ropose a novel method of chaotic modulation based on the combination of Chaotic Pulse Position Modulation (CPPM) and Chaotic Pulse WidthModulation (CPWM). This combination looks very promising for the improvement of information privacy in chaos-based digital communications. In the CPPM+CPWM method,

16、each pulse is a chaotic symbol which carries binary information of two bits corresponding to its position and width, where the position is determined by the interval between rising edge of the current pulse compared to the previous one and the width is determined by the duration between the rising e

17、dge and the falling edge of the same pulse. This offers the increase of bit rate, bandwidth efficiency and privacy in comparison with the method of CPPM. The schemes of Modulation andDemodulation (MoDem) of CPPM+CPWM are proposed, designed and analyzed that based on the conventional schemes of CPPM.

18、 The numerical simulation in time domain of the system of CPPM+CPWM MoDem is implemented in Matlab/Simulink. It gives a summary of theoretical and practical studies on the properties of pulse-phase modulation, developed mainly in 1943. The properties of pulse-phasemodulation are studied by means of

19、Fourier transformations. Although some approximations are introduced, the calculations lead to the following definite conclusions: (1) Pulse-phase modulation introduces no amplitude distortion except at sub-multiples of the recurrent frequency. (2) The harmonic distortion, if any, is negligible and

20、this method of modulation can be used for high-quality broadcasting. (3) Pulse-phase modulation is subject to a special type of distortion called ?cross-distortion,? produced by side bands of the recurrent frequency appearing in the signal bandwidth. Curves of the approximate amount of this type of

21、distortion are given, and it is shown that, in practical multi-channel systems, this distortion is negligible, provided that the recurrent pulse frequency is at least double the highest signal frequency to be transmitted, and preferably equal to, or greater than, three times this frequency. This stu

22、dy is followed by considerations on the signal/noise ratio in pulse-phase modulation. Pulse-phasemodulation is compared with amplitude modulation and a formula, giving the improvement in the signal/noise ratio due to pulse-phase modulation, is established by very simple considerations. It is shown t

23、hat this ratio improves as the frequency bandwidth used in pulse-phase modulation. It is shown how an improvement of 3 db in signal/noise ratio can be obtained by suppressing the noise on the synchronizing pulse, and a practical circuit developed and applied in 1943 by the author is described. Final

24、ly, a typical example of pulse technique is given. In practical circuits the modulator and demodulator pulses are not perfectly shaped, because of the departure from linearity due to finite time-constants. This introduces harmonic distortion. It is shown how this distortion can be practically elimi-

25、 nated by designing circuits so that the time constant is equal at modulationand demodulation. It present a novel technique for digital data modulation and demodulationcalled triangular modulation (TM). The modulation technique was developed primarily to maximize the amount of data sent over a limit

26、ed bandwidth channel while still maintaining very good noise rejection and signal distortion performance. Themodulation technique involves breaking digital data into a series of parallel words. Each word is then represented by one half period of a triangular waveform whose slope is proportional to t

27、he value of the parallel word it represents. Thedemodulation technique for this uniquely defined waveform involves first digitizing the waveform at a higher constant sampling rate. A linear regression algorithm using the method of least squares is then used to compute the slope of the digitized wave

28、form to a very high precision. This process is repeated for each rising and falling edge of the triangular modulated waveform. All encoded data is extracted by precise slope computation since each slope uniquely defines the encoded data word it represents. The ability of the demodulation algorithm t

29、o compute the exact slope of the modulated waveform determines how many bits can be represented by the modulated waveform. Transmission channel bandwidth limitations determine the allowable range of slopes used. Several simulations are performed to provide a sample of how the modulation method will

30、perform in various real world environments. The paper also discusses several application areas where themodulation technique will provide superior results over other modulation methods. The theory of constant envelope orthogonal frequency division multiplexing (CE-OFDM) is analyzed in this paper, al

31、ong with the introduction of the implementation method of CE-OFDM technique. Besides, the modulation and demodulation process is simulated and analyzed. And the results indicate that CE-OFDM conducts phasemodulation on the basis of OFDM modulation. Thus, FFT/IFFT is implemented in the transmitting a

32、nd receiving terminals. Furthermore, the method of equalization applied in the demodulation process can optimize system performance. And also, CE-OFDM solves the problem of high peak-to-average power ratio (PAPR) in OFDM, reducing PAPR to 0Db. High efficient modulation technology is a hot research t

33、opic. UNB modulation, for its good performance, is paid to more attention. First, the article introduces EBPSK modulation scheme as UNB modulation method, gives its time and frequency domain characteristics and presents its optimized form in the same time, which can lower the sideband power level, w

34、hile keeping the modulation information un-lost. Then, filter design is discussed about two zero and two pole digital filter, which shows narrower bandwidths and a fast response speed to the EBPSK based UNB modulated signals, although the filter bandwidth is much narrower, the modulationinformation

35、still can be seen after the modulated signals filtered using it. Last, simulation is done about EBPSK based UNB modulation and demodulation, and experimental results show that EBPSK based UNB modulation has high bandwidth efficiency and a good, even better BER performance using the filters. 中文译文 数字调

36、制解调技术在数字通信中占有非常重要的地位,数字通信技术与FPGA 的结合是现代通信系统发展的一个必然趋势。软件无线电的发展,对调制解调技术提出了越来越高的要求。本文首先从数字调制解调理论入手,分析了三种重要的恒包络调制解调方式(FSK,MSK,GMSK)的基本原理;该罗德&施瓦茨sme03 ，信号发生器，提供上午调制和外部的 FSK 数字调制所需的开发和测试数字移动无线电接收器。PWM 在几种模拟通信信号数字调制解调中的应用研究结果表明，本文所设计的软件无线电数字中频调制解调模块能够满足软件无线电对中频调制解调器的性能要求。摘要设计了一种利用红外光的脉宽调制信号来采集输液信息的医用微量输液装置

37、。调制解调器是由调制器和解调器组成。对数字解调中的关键时间同步采用软件实现。本文主要研究了软件无线电中数字中频调制解调模块的设计和实现，设计了一个以数字信号处理器、微控制器和 AD/DA转换器等器件为核心的基本硬件平台，运用正交调制程序对数字、模拟基带信号实现数字正交调制，上变频至中频信号输出；本文以软件无线电的理论为基础，研究了软件无线电中的部分关键技术：包括数字上下变频的实际处理模型以及调制解调部分的实现。双向工频通信技术(TWACS)是一种基于电力配电网络的新型通信技术,具有独特的调制解调机理。本文研究了基于 802.文中介绍了QPSK 调制解调的原理,并基于 FPGA 实现了 QPSK

38、 调制解调电路。随着科学技术的进步，特别是计算机技术、数据编码与压缩技术、数字调制技术和超大规模集成电路技术的发展，全球迎来了电子信息产业数字化的新时代。首先对传真通信的特点作了阐述，简单介绍了传真信号的调制、解调方式。在数字信号的自动调制方式识别中,差分后求包络方差对于区分 FSK、PSK 信号具有十分重要的意义。航天学，宇宙航行学研究宇宙飞行的科学及技术载波相位噪声对 QPSK 调制解调的影响是不可忽略的,也是难以分析的。 数字调制和解调技术在数字通信系统中扮演着重要的角色，数字通信技术和 FPGA 的相结合必然是一个趋势。随着软件无线电的发展，对调制与解调技术的要求越来越高。本文首先研究

39、数字调制与解调的原理,并分析了三种重要的调制与解调的基本原理(移频键控、MSK、实现 GMSK)。罗德和陈高凌的SME03,信号发生器，提供外部移频键控调制和数字调制所需数字移动无线电接收机的开发和测试。应用 PWM 数字调制与解调模拟通信信号在几个调制模式研究结果证明数字如果调制器和解调器的设计软件无线电的软件无线电的能力和要求放松警惕。输血速度监控系统设计基于红外技术的调制和解调。调制器和解调器。时间同步是数字解调 cc 盟军的关键技术软件。本文提供了数字如果调制器和解调器的硬件设计包括的软件无线电数字信号处理器、微控制单元和 AD / DA转换器etc.Digital上/下变换器(DDC

40、 / DUC),调制和解调是论文讨论的一些特别提款权平台不可缺少的部分。双向自动通信系统(TWACS)是一种新的分销网络价值的通信技术,具有特殊的调制和解调。在本文中,我们研究了 OFDM 技术在802.16 基础上,实现基带调制和解调用 TMS320C6201 和优化软件模块。介绍了QPSK 调制和解调的原理,电路也实现基于 FPGA。随着技术的提高,特别是计算机技术等领域,数据编码和压缩,数字调制和集成电路。全球电子信息产业进入数字时代。 首先,传真通信的特性,调制和解调方式。在数字调制信号自动分类,计算信封后方差差异区分相移键控和移频键控信号具有重要意义。太空飞行的科学和技术。QPSK

41、调制和解调的影响不能忽视,通过载波相位噪声,很难分析。 数字调制误差的参数，如误差矢量幅度 EVM，它在测试和信息系统的测量中很重要。本文介绍了数字调制误差参数计量技术的研究进展。首先，我们指出了存在的领域，这是一个关于溯源和校准参数范围的基本问题，并介绍了相关的研究，如RF 波形计量“的思想和技术。然后，我们强调我们的团队的研究进展：1）。计量的方法和系统，用于数字解调误差参数的基础上连续组合，其适合BPSK，QPSK，8PSK，16QAM，64QAM 调制：该方法能够实现可追踪性和错误设定的能力在很宽的范围内，当标准 EvmRms 是 1.585，则扩展不确定度（K = 2）为 0.009

42、。 2）。计量方法和系统 digitaldemodulation 误差参数基于模拟 AM 或 PM。 3）。计量方法和系统基于 IQ 增益的不平衡和相位不平衡数字解调误差参数。 4）。计量方法和系统基于模拟 PM 中的 GMSK 和 FSK 调制的纵横数字解调误差参数。 5）。计量方法和系统基于基带波形设计数字解调误差参数。根据这些方法，我们的建议是给出如下：第一，建立数字调制误差参数计量公共标准;第二，研制的新型仪器“矢量信号分析仪校准器”。 在本文中，我们提出了一种新的基于混沌脉冲位置调制（CPPM）相结合的混沌调制和混沌脉冲 WidthModulation（CPWM）的方法。这样的组合看

43、起来非常有前途的信息隐私混沌为基础的数字通信的改善。在 CPPM + CPWM 方法中，每个脉冲是一个混乱的符号携带两个比特的对应于它的位置和宽度，其中所述位置由间隔的电流脉冲的上升沿比前一个和宽度之间确定的二进制信息由上升沿和相同的脉冲的下降沿之间的持续时间来确定。这提供的比特率，带宽效率和隐私与CPPM 的方法相比增加。 CPPM 调制 andDemodulation（调制解调器）+ CPWM 的方案提出，设计和分析的基础上 CPPM 的常规方案。在 CPPM + CPWM 调制解调系统的时域数值模拟在 Matlab / Simulink 来实现。 它给出了理论和实践的研究对脉冲相位调制的

44、特性的总结，主要是在 1943年开发的脉冲 phasemodulation 的性质由傅立叶变换装置的影响。虽然一些近似的引入，计算导致以下明确的结论：（1）脉冲相位调制引入除了在子倍数复发频率没有幅度失真。 （2）谐波失真，如果有的话，是可以忽略的，可用于高品质广播调制的此方法。 （3）脉冲相位调制是经历失真的一种特殊类型的称为？交叉失真，？由反复频率出现在信号带宽的边带生成。这种类型的失真的近似量的曲线给出，它表明，在实际的多通道系统中，这种失真可以忽略不计，但前提是复发性脉冲频率至少两倍最高信号频率进行传输，并且优选等于或大于该频率的三倍。本研究之后是在脉冲相位调制的信号/噪声比的考虑。脉

45、冲phasemodulation 与调幅和式相比，给予在信号/噪声比由于脉冲相位调制的改善，是通过非常简单的考虑确立。它表明，这个比率提高作为脉冲相位调制中使用的带宽。它示出了如何为 3 分贝的信号/噪声比的改善可以通过抑制上的同步脉冲的噪声来获得，并且实际电路开发并描述在 1943 年应用由作者。最后，脉冲技术的一个典型实例。在实际电路中的调制器和解调器的脉冲并不完全因为形状从线性，由于有限的时间常数的离去。这引入了谐波失真。它示出了如何这种变形可被实际消除通过设计电路经过 NAT 使得时间常数等于在 modulationand解调。 它提出了一种新的技术用于数字数据的调制和 demodul

46、ationcalled 三角调制（TM）。该调制技术被开发主要是为了最大限度地发送一个有限带宽信道，同时仍然保持非常好的噪声抑制和信号失真性能的数据量。 Themodulation 技术涉及破数字数据转换成一系列平行的话。每个字随后由三角波形的斜率正比于并行字它代表的值的二分之一周期表示。 Thedemodulation 技术这个唯一定义波形包括首先进行数字化，在较高的抽样速率恒定的波形。使用最小二乘法的线性回归算法随后被用来计算数字化波形的斜率，以非常高的精度。这个过程被重复为三角调制波形的每个上升沿和下降沿。所有的编码数据是通过精确的计算斜率提取，因为每个坡唯一确定它代表的编码数据字。解调

47、算法来计算经调制的波形的精确斜率的能力决定有多少位都可以用调制波形来表示。传输信道带宽的限制确定用于斜率的允许范围内。多个仿真被执行以提供如何调制方法将在各种现实世界环境中执行的样品。本文还讨论了几个应用领域 themodulation 技术将提供比其它调制方法更好的结果。 恒包络理论正交频分复用(CE-OFDM)进行了分析,以及介绍CE-OFDM技术的实现方法。此外,调制和解调过程的模拟和分析。结果表明 CE-OFDM 进行phasemodulation OFDM 调制的基础上。因此,FFT /之实现发射和接收终端。此外,均衡解调过程中应用的方法可以优化系统性能。而且,CE-OFDM 解决问

48、题的高 peak-to-average 功率比(地表铺面)在 OFDM,减少地表铺面 0 分贝。 高效调制技术是一个热门研究话题。超窄带调制,以其良好的性能,更多的关注。首先,本文介绍了摘要调制方案作为超窄带调制方法,让时间和频域的特征,提出了优化的形式在同一时间,可以降低边带功率电平,同时保持 un-lost 调制信息。然后,滤波器设计讨论了两个零和两个数字滤波器,它显示了窄带宽、响应速度快的摘要基于超窄带调制信号,虽然滤波器带宽更窄,modulationinformation 仍然可以看到调制信号过滤后使用它。最后,仿真是基于摘要的超窄带调制和解调,和实验结果表明,基于摘要的超窄带调制具有高带宽效率和良好的,甚至更好的误码率性能使用过滤器。