In this dissertation, the multilevel differential amplitude and phase shift keying modulation in OFDM system is investigated.
论文首先介绍了日本CRL开发的毫米波宽带无线接入OFDM实验系统，作为后续研究的基础。
Differential Phase Shift Keying is very hot in the optical transmission technologies during recent years, thanks to its excellent characteristics in some transmission systems experiments.
差分相移键控调制方式是近年来光传输技术的一个研究热点，在一些传输试验系统中表现出了优越的性能。
To cope with the problem of phase shifts caused by different propagation paths, the modulation is done in differential phase shift keying.
为了应付不同所造成的问题逐步转向传播途径调制做差相键控。
We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying signals based on four-wave mixing in highly nonlinear fiber.
我们从数值上研究了基于高非线性光纤四波混频效应的差分相移键控信号高效波长转换的主要限制条件。
DPUSTM, which consists of USTM and Differential Phase-Shift Keying modulation, is not only easier to improve the spectral efficiency than USTM, but also simpler to demodulate.
DPUSTM将酉空时调制和差分相移键控调制有机地融合，在提高系统频带利用率方面比目前已有的USTM系统更简单易行。
For the firsttime, we observed the time differential effect of an electromagnetic wave inpropagation due to diffraction, and Gouy phase shift phenomenon around the focuspoint.
实验还验证了电磁波在聚焦过程中的Gouy相移现象，并且首次观察到电磁波在自由空间传播过程中的微分变换现象。
The influences of first-order polarization-mode dispersion on systems using differential phase-shift keying and on-off keying with 40 Gb/s non-return-to-zero or return-to-zero formats were studied.
研究了40Gb/s非归零或归零格式下，差分相移键控和开关键控信号对一阶偏振模色散的影响。
A 4-port waveguide differential phase? shift circulator symmetrically loaded with ferrite samples is introduced The circulator is designed and optimized by using HFSS software and high? power?
摘 要：提出了一种对称加载铁氧体波导差相移式四端环行器，利用HFSS软件的仿真分析和高功率实验研究的方法对该环行器进行了仿真设计和优化，并验证了预期的高功率设计指标。
At present, many researches about all-optical wavelength converters only based on the signal modulation formats of binary amplitude shift keying (OOK) and differential phase shift keying (DPSK), but it is very few to the signal modulation format of polarization shift keying (PolSK).
目前，全光波长转换器的研究主要集中在二进制振幅键控（OOK）和差分移相键控（DPSK）信号调制格式，对于偏振移位键控（PolSK）信号调制格式全光波长转换的研究很少。
Punctured convolutional coding with an 8, 16 and 32 differential amplitude and phase shift keying (DAPSK) modulation is considered.
研究带删除卷积码的8、16、32差分幅/相移键控（DAPSK）调制。
Design and Performance of Differential Phase-Shift High-Power Ferrite Circulator
差相移式高功率铁氧体环行器的设计
In one scheme, a non-return-to-zero differential phase shift keying signal was generated as a payload, while in another scheme, a non-return-to-zero differential quadrature phase shift keying format payload was introduced.
提出以改进型双二进制归零码信号作为标记，分别采用差分相移键控非归零码信号和差分正交相移键控非归零码信号作为载荷进行正交调制的新方案。
Phase FM-DCSK (Frequency Modulation-Differential Chaos Shift Keying) for increasing the data rate of the chaos modulation system is proposed.
为进一步提高混沌通信系统的传输速率，提出了一种基于FM（frequencymodulation）的四相混沌键控方法。
In this paper, the propagation constant transcendental equation for dielectric loading twin toroidal phase shifter using grooved waveguide is given. With typical parameters, freguency characteristics of the differential phase shift and the insertion loss are computed.
本文给出介质加载双环背脊波导移相器的传输常数方程，计算了典型参数的相移，和损耗的频率特性。
With optimum input power, the differential phase Q-factor penalty was more than 204 dB for ASE-induced linear phase noise and less than 7.5 dB for G-M phase shift.
在最优输入功率的条件下，由ASE带来的线性相位噪声引起的系统差分相位Q值代价大于204dB，由G-M相移引起的系统差分相位Q值代价小于7.5dB。
The accuracy of differential-phase shift measurement with this standard is better than 0.002 ° over a frequency range of " zero " to 50 kHz and 0.005 ° of 50 to 100 kHz.
此标准测量差值相位的准确度，在零到50kHz频率范围内优于0.002°，在50～100kHz范围优于0.005°。
The effects of weak optical feedback (WOF) on the bit error rate (BER) of coherent optical differential phase shift key-controll (DPSK) systems are presented.
本文讨论了弱光反馈对相干光差分相移键控系统误码率的影响。
The theoretical and experimental results of a nonreciprocal H plane dielectric-loaded H plane ferrite phase shifter are presented, including the approximate formula of differential phase shift and the transcendental equation of differential phase shift frequency response with zero slope.
本文报告了H面铁氧体非互易移相器的H面介质加载的研究结果；推导了该器件的差相移近似表达式及差相移频率特性斜率为零时的超越方程。
At present, domestic spaceflight Unite S Band (USB) TT & C network and transponder adopts Differential Phase Shift Key (DPSK) modulation, which is implemented by hardware and cannot be used on pico-satellite.
目前国内航天飞行器USB测控网和测控应答机采用DPSK调制方式，采用硬件方式实现调制和解调功能，体积、重量和功耗较大，不能满足皮卫星应用环境。
To do away with the fussiness of phase when carrier wave recovers in the coherent demodulation of quadrature phase shift keying (QPSK), the equations are deduced as to how to natural differential coder in the sender and decoder in the receiver.
为了消除四相相移键控（QPSK）调制方式中相干解调时载波恢复存在的相位模糊问题，本文推导了在收发两端所分别插入的自然码差分编译码方程。