随机信号

One of the most important issues of pulse position modulation for optical wireless communications is the receiver symbol synchronization subsystem, in this paper, the basic principle of symbol synchronization for PPM sequence is discussed, and the upper limit of exact synchronization probability for random PPM sequence is analyzed.

讨论了PPM序列的符号同步原理；在分析随机PPM序列的精确符号同步概率上限的基础上，给出了一种在PPM序列中插入同步信号来实现PPM精确符号同步的方案及其数字逻辑电路实现。

Signal processing approach presented in this paper based on neural network algorithm (spectral analysis, Random noise filtering) does not involve the complex multiplication and addition operations. Its computing accuracy is high. It is particularly suitable for the implementation of software and hardware based on DSP chip.

所提出的基于神经网络算法的信号处理方法(频谱分析、随机噪声滤波)不涉及复数的乘法运算和复数的加法运算，计算精度高，特别适合基于DSP芯片的软、硬件实现。

The main factors effecting on exploration precision of surface wave are analyzed in the light of calculation of phase velocity of surface wave; the merits and demetits of common computing methods for phase velocity between stations and their applied range are discussed and calculation of interstation Green's function for correcting phase is put forward to get the precise phase difference between two stations.

分析了影响面波勘探精度的主要因素，针对计算面波相速度的精度问题，讨论了常用测量台间面波相速度方法的优缺点及其适用范围，并提出通过测量台间格林函数进行相位校正，以得到两台之间的精确相位。以合成的高频理论地震图作为记录信号，并在理论地震图上叠加了 2 0 %的随机噪声，利用这些方法分析理论信号，数字实验表明：在相干频率范围内，格林函数方法能够精确测量台间相速度，而互相关法和窄带通滤波互相关法所得结果较为离散。

The detector can work safely and effectively in the active mode and exploit fully the inherent performance of SPAD' s .

在分析原偏振光量子随机源工作原理的基础上，为了获得高效率的随机数信号，我们设计了快速调制的信号源，高效的单光子探测器。

Commonly, much attention of weak signal detection technology has been focused on seeking the way to reduce or remove noise.

随机共振的本质是由于输入信号、噪声和非线性系统的共同作用，使部分噪声能量转化为信号能量。

Results Group C had the symptoms such as reduced activity, acceded, indulge in lying and weight loss after 3 weeks of immune injection, 14 out of 16 SD rats in Group B had the same symptoms as Group C after 4～5 weeks of immune injection, the serum enzymes in model groups increased significantly compared with those of the control group, model group C was much higher than model group B; the duration shorted, amplitude decreased, multiphase wave increased in electromyogram of model groups; MRI examination revealed samples from model group B and C had one positive case each, which presented T1MI isodensity or hypodensity signal, T2MI and STIR serial hyperdensity signal, revealing muscle inflammation; all rats'skeletal muscle from model group C and 11 out of model group B had pathological changes, which exhibited striated muscle focal fiber degeneration, necrotized and inflammatory cell infiltration, interstitial vessel wall thickening, random cardiac muscle samples had 3 positive changes, which had similar changes to skeletal muscle, there was 1 positive change from lung sample.

结果：模型C组于免疫注射第3周左右开始出现活动减少，倦怠嗜卧，食欲体重下降等表现，模型B组有14只SD大鼠于免疫注射第4～5周出现上述症状，较C组为轻；模型组肌酶谱中，肌酸激酶、乳酸脱氢酶、谷草转氨酶与对照组比较明显升高，模型C组较模型B组升高更显著；模型组肌电图时限缩短，波幅降低，多相波增多；磁共振检查模型B组和C组选送标本中各有一例有阳性改变，表现为T1MI等或稍低信号，T2MI及STIR序列为高信号，提示肌肉炎症水肿改变；模型B组有11只，模型C组全部大鼠骨骼肌出现病理改变，表现为横纹肌局灶性分布的肌纤维变性炎细胞浸润，间质小血管壁增厚、扩张，随机选送的心肌标本中有3例有阳性改变，表现与骨骼肌相仿，选送的肺标本中有1例有阳性改变，表现为蛋白渗出，炎症细胞浸润和小血管改变。

It put forwarded the concept of comfortable natural wind at first and confirmed the types of comfortable natural wind signal. Meanwhile, it decided to use the preferential-selecting natural wind signal as the control signal.

研究中首先提出了舒适性自然风的概念，确定了舒适性自然风采样信号的类型，并提出用优选自然风样本作为随机自然风控制信号。

In the precision light screen velocity measuring system, a signal processing technology based on the arithmetic of image processing is put forward to eliminate the interference of random noise to opto-electronic detected signals, so the interval time of the object flying through the two light screens can be gained accurately.

在光幕靶精密测速系统中，提出了一种基于图像处理算法的信号处理技术，消除随机噪声对光电探测信号的干扰，从而可以精确获取物体通过前后两光幕靶的间隔时间。

With the description of the measurement error as Gaussian random variable,the error of real-time measurement of slow fading signal with the RAKE receiver is analyzed.

本文研究了宽带衰落信道中慢衰落信号的实时测量，通过将测量误差描述为高斯分布的随机变量，分析了利用RAKE接收机实时测量慢衰落信号的误差。

Each test signal of tank gun control test system usually has random disturbance , real-time recurrence filtering for test signals is performed by means of Kalman filtering.

火炮控制检测系统各检测信号大多含有随机干扰，利用卡尔曼滤波可对检测信号进行实时递推滤波。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。