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相干解调器
相关语句
  coherent demodulator
     For example, compared with ideal coherent demodulator, this system's degradation is less than 0.5dB. In burst mode, acquisition time is less than 200T(T equal to symbol period), and frequency acquisition range is in continuous mode.
     如误码率性能与理想相干解调器相比损失小于0.5dB,在等于5dB的情况下突发信号同步时间小于200T(T为码元周期),连续信号频率捕捉范围为等。
短句来源
     Based on a statistical model which describes the phase fluctuation of laser field due to the spontaneous radiation as a Wiener process, a modification to the conventional theory of correlation receiver can be made so as to calculate the error rate of ASK, FSK and PSK coherent demodulator and evaluate the penalty of receiver sensitivity under the condition that the carrier is parasitically frequency-modulated by a stationary Gaussian noise.
     文章从一种统计模型出发,指出由自发辐射所造成的激光场相位起伏是一个维纳过程。 据此对传统的相关接收机理论作出了修改,能够用来在载波含有平稳高斯型寄生调频的条件下计算ASK、FSK、PSK相干解调器的误码率,估计载波相位起伏所导致的接收机灵敏度损失。
短句来源
  “相干解调器”译为未确定词的双语例句
     Improvement of the Performance of a Coherent FSK System
     有色噪声下FSK相干解调器性能的改善
短句来源
     Simulation results show that Doppler frequency shift range from -Rb/2 ~ Rb/2 degrades the bit error rate Pb performance of new quasi - coherent demodulator about 0. 3dB. The Doppler rate can be as large as 4000Hz per second when the bit rate Rb is 9. 6k bits per second.
     仿真结果表明,多普勒频移在-Rb/2~Rb/2范围内变化时,与理论值相比,采用该方法的准相干解调器误比特率Pb 性能恶化仅为0.3dB。 在信息速率Rb=9.6kbps时,多普勒频移速率可达4000Hz/s。
短句来源
     Sync Error Analasis On Television Signal Passing Through Choherent Demodulator
     电视相干解调器的同步误差分析
短句来源
     OPTIMAL COHERENT DETECTION OF FSK SIGNALS WITH IMBALANCE AMPLITUDES IN THE PRESENCE OF COLORED GAUSSIAN NOISE
     一种新的FSK最佳相干解调器
短句来源
     OPTIMAL COHERENT DETECTOR OF MFSK SIGNALS WITH IMBALANCE AMPLITUDES IN THE PRESENCE OF COLORED GAUSSIAN NOISE
     新型MFSK最佳相干解调器
短句来源
更多       
  相似匹配句对
     Sync Error Analasis On Television Signal Passing Through Choherent Demodulator
     电视相干解调器的同步误差分析
短句来源
     OPTIMAL COHERENT DETECTOR OF MFSK SIGNALS WITH IMBALANCE AMPLITUDES IN THE PRESENCE OF COLORED GAUSSIAN NOISE
     新型MFSK最佳相干解调器
短句来源
     Odd-even Coherent State of q-
     q——奇偶相干
短句来源
     The Coherent Effect of Bioohotons
     生物光子的相干效应
短句来源
     Virtual Amplitude Modulation and Demodulation Instrument
     虚拟调幅波解调器
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This paper deals with the effect of FM quantum noise of laser sources on the receiver performance in coherent fiber-optic communication systems. Based on a statistical model which describes the phase fluctuation of laser field due to the spontaneous radiation as a Wiener process, a modification to the conventional theory of correlation receiver can be made so as to calculate the error rate of ASK, FSK and PSK coherent demodulator and evaluate the penalty of receiver sensitivity under the condition that the carrier...

This paper deals with the effect of FM quantum noise of laser sources on the receiver performance in coherent fiber-optic communication systems. Based on a statistical model which describes the phase fluctuation of laser field due to the spontaneous radiation as a Wiener process, a modification to the conventional theory of correlation receiver can be made so as to calculate the error rate of ASK, FSK and PSK coherent demodulator and evaluate the penalty of receiver sensitivity under the condition that the carrier is parasitically frequency-modulated by a stationary Gaussian noise. Numerical results show that if the product Dr (phase diffusion constant of laser x delay time of carrier recovery circuit of demodulator) is greater than 1, the sensitivity loss of fiber-optic receivers which employ coherent demodulation will be in the order of 10 dB. Therefore laser noise suppression certainly plays a key role in the efforts to fully take the potential advantage of coherent fiber-optic communication.

本文分析了激光源FM量子噪声对数字光纤相干通信接收机性能的影响。文章从一种统计模型出发,指出由自发辐射所造成的激光场相位起伏是一个维纳过程。据此对传统的相关接收机理论作出了修改,能够用来在载波含有平稳高斯型寄生调频的条件下计算ASK、FSK、PSK相干解调器的误码率,估计载波相位起伏所导致的接收机灵敏度损失。计算实例显示,在激光源相位扩散常数与解调器载波恢复电路延迟时间之积D_τ>1时,光纤相干解调接收机的灵敏度损失会达到10dB量级。因此,为了发挥光纤相干通信的潜在优越性,压抑激光器噪声是必须解决的技术关键。

We hold that when the peak of signal and that of noice are equal,threshold critical point begins to appear on the incoherence demodulator,so the calculated threshold value is 9dB for FM signal or is 4.3dB forAM signal. In the end, we futher tell the way of lowering the thresholdvalue.

本文认为信号的峰值和噪声的“峰值”相等是非相干解调器出现门限的临界点。据此算得FM波非相干解调器的门限值为dB,AM波的为4.3dB。最后还指明了降低非相干解调器门限值的途径。

In this paper,the coherent and non-coherent demodulators are considered as basic demodulation devices,and by using a concise but accurate method,the figures of merit of DSB,SSB,AM signals are respectively calculated,and the relevant physical meanings are given.It is emphasized that under some poor SNR conditions,the“threshold effect”of non-coherent demodulator degrades seriously,even causes the receiver to be out of work.

文章把相干解调器和非相干解调器作为基本解调器件,以简明、准确的分析方法分别对 DSB、SSB 及 AM 信号的信噪比得益进行数学计算,并给予一定的物理解释。本文特别指出,在小信噪比输入的条件下,非相干解调器的“门限效应”严重恶化,甚至使收信机无法工作。

 
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