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复合调制     
相关语句
  hybrid modulation
     A hybrid modulation scheme of dual n-ary orthogonal spread spectrum and MPSK (DNOrth-MPSK) was proposed.
     提出了一种双多进制正交扩频调制与MPSK相位调制相结合的复合调制方案(DNOrth-MPSK).
短句来源
     Finally,the waveform generator is used to produce FSK/PPM hybrid modulation signal and better performance is obtained.
     利用该波形发生器产生FSK/PPM复合调制信号,经过实验验证得到较好的结果.
短句来源
     Performance Analysis of DNOrth-MPSK Hybrid Modulation System Based on Pilot Symbols
     基于导频符号的双多进制正交扩频与MPSK复合调制系统的性能分析
短句来源
     Based on the staircase modulation method and hybrid modulation method in hybrid cascade multilevel con-verter,this paper analyzed the harmonic spec trum of output voltage respectively,and then derived the harmonic expres-sion s.
     基于阶梯波调制法和复合调制法,量化分析了混合级联型多电平变换器(HybridCascadeMultilevelConverter,简称HCMC)输出电压波形的谐波分布,推导出其谐波解析表达式。
短句来源
  complex modulation
     Research on Anti-interference and Doppler Margin Performance of Complex Modulation Fuze
     伪码调相与线性调频复合调制引信抗干扰及多普勒容限性能研究
短句来源
     The fuzzy fuuction of the complex modulation signal is derived. The 3D ambiguity graphs are presented.
     详细推导了发射信号的模糊函数,给出了三维模糊图,并借助MATLAB对复合调制信号在不同多普勒频移情况下做了仿真实验。
短句来源
  composite modulation
     To improve anti-jamming performance of the system and make it have the advantages of intelligence,the fuze system uses the technique of the composite modulation, IF digitization,spectrum signal process and self-adaptive anti-jamming.
     系统在实现过程中综合采用多体制复合调制、中频数字化、频域信号处理技术和干扰识别和对抗技术,不仅提高了系统抗干扰性能,而且具有智能化、可编程的特点。
短句来源
  multi-modulation
     The pseudo-random FSK/PSK multi-modulation signal and the partly-matched processing signal remain the information of the target of interest.
     伪随机FSK/PSK复合调制信号与非完全匹配处理信号包含了所观测目标的信息。
短句来源
     The hybrid signals are the combined signals with multi-modulation mode.
     复合调制信号指的是采用两种或者两种以上调制方式对信号进行调制得到的组合信号。
短句来源
     Based on the analysis of the equal-probability-distributing FSK/PSK multi-modulation signal,we construct a new pseudo-random FSK/PSK multi-modulation signal and we design and simulink on the computer the partly-matched processing signal of this signal.
     在分析等概率分布的FSK/PSK复合调制信号的基础上,构造了一种新的伪随机FSK/PSK复合调制信号及其非完全匹配处理的设计及仿真。
短句来源
     2. Present the concept of the partly-matched procession of the multi-modulation signal.
     2、 给出了复合调制信号的非完全匹配处理的概念。
短句来源
     The purpose of the design is to construct a processing signal to combine with the pseudo-random FSK/PSK multi-modulation signal,so that we could get a strong response of the target.
     设计的目的是能对伪随机FSK/PSK复合调制信号进行处理的处理信号,以期获得对所探测目标信息的强探测。
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  hybrid modulation
In this section, we propose a hybrid modulation technique to embed and detect fingerprint code.
      
We then proposed a hybrid modulation technique that could handle the large size of fingerprint code.
      
  complex modulation
Within the structure mentioned, instead of complex modulation patterns, pulse amplitude modulation (PAM) combined with PO-CI spreading code is utilized.
      
β3-adrenoceptors have recently been shown to induce a complex modulation of intracellular signaling pathways including cyclic guanine monophosphate, cyclic adenosine monophosphate, Nitric oxide, and protein kinases A and C.
      
Therefore, the galactic cosmic ray intensities close to Earth is the result of a complex modulation of the interstellar galactic spectrum within the heliosphere.
      
The algorithm computes transformations of oscillations with complex modulation and large angle modulation indexes in analog circuits.
      
The Use of Pulsed Electromagnetic Fields with Complex Modulation in the Treatment of Patients with Diabetic Polyneuropathy
      
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  composite modulation
Figure 2.30 shows the spectrum of an FM oscillator with sinusoidal carrier and a composite modulation made of two sinusoids.
      
Synthesize a frequency modulated sinusoid in the case of composite modulation.
      
  multi-modulation
A multi-modulation scheme is also possible, but the performance for the users with the high data rates are significantly worse than for the other schemes.
      
  其他


Focusing on combined N-ary orthogonal spread spectrum and M-ary differential phase shift keying(NOrth-MDPSK),this paper investigates the bit error rate(BER) with frequency offset in single path slow fading channel model.First the overall probability theorem and Markov chain were applied to establishing a unified framework for performance evaluation,and under this framework,the BER formulas for AWGN,Rayleigh and Nakagami-m fading channels were derived.Numerical results show that NOrth-MDPSK provides higher bandwidth...

Focusing on combined N-ary orthogonal spread spectrum and M-ary differential phase shift keying(NOrth-MDPSK),this paper investigates the bit error rate(BER) with frequency offset in single path slow fading channel model.First the overall probability theorem and Markov chain were applied to establishing a unified framework for performance evaluation,and under this framework,the BER formulas for AWGN,Rayleigh and Nakagami-m fading channels were derived.Numerical results show that NOrth-MDPSK provides higher bandwidth efficiency at the cost of very low performance loss when compared with pure NOrth.

针对N进制正交扩频和MDPSK复合调制(N O rth-MDPSK),分析了单径慢衰落信道模型中带有频差时的误比特率。首先运用全概率定理和马尔可夫链,建立了性能分析的统一框架;在此框架下,推导了AW GN、瑞利衰落和N akagam i-m衰落信道中的误比特率公式。数值结果表明,与单纯N O rth相比,N O rth-MDPSK以较低的性能损失代价,提供了更高的带宽效率。

For N-ary Orthogonal Spread Spectrum with MDPSK(NOrth-MDPSK)signal,existing detection algorithm detects the orthogonal signal and DPSK signal successively and independently.And the BER performance of DPSK signal depends heavily upon the detection performance of orthogonal signal.The performance of the whole system is hence limited.To mitigate this situation,this paper derives the optimum detection algorithm for NOrth-MDPSK signals based on the criterion of maximum a posteriori probability(MAP). In accordance...

For N-ary Orthogonal Spread Spectrum with MDPSK(NOrth-MDPSK)signal,existing detection algorithm detects the orthogonal signal and DPSK signal successively and independently.And the BER performance of DPSK signal depends heavily upon the detection performance of orthogonal signal.The performance of the whole system is hence limited.To mitigate this situation,this paper derives the optimum detection algorithm for NOrth-MDPSK signals based on the criterion of maximum a posteriori probability(MAP). In accordance with the detection characteristic of DPSK signals,the proposed algorithm takes full advantage of all despread orthogonal symhOols in two successive symbols interval and detects the orthogonal signal and DPSK signal of current symbol jointly.The computer simulation in the end confirms the effectiveness of the proposed algorithm.

在多进制正交扩频MDPSK复合调制系统中,现有的检测算法先后独立地进行正交扩频比特与差分相位比特的检测,这使得差分相位比特检测性能与正交检测的性能息息相关,限制了整个系统的误比特性能。针对这一情况,本文基于最大后验概率(MAP)准则,提出了NOrth-MDPSK最佳检测算法。该算法根据差分相位检测的特点,充分利用前后两个符号周期内所有的正交相关值,联合检测当前符号的正交扩频比特和差分比特。仿真结果表明,本文所提算法能够有效地缓解正交检测的性能对系统性能的限制。

Combining with computer technique,based on CPLD,an arbitrary waveform generator with I、Q double channel was designed and the software design that makes it work was provided.Finally,the waveform generator is used to produce FSK/PPM hybrid modulation signal and better performance is obtained.

结合计算机技术,基于高速复杂可编程逻辑器件(CPLD)设计出一种正交I、Q双通道的任意波形发生器,同时给出了协调其工作的软件设计.利用该波形发生器产生FSK/PPM复合调制信号,经过实验验证得到较好的结果.

 
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