查询词典 dispreading

In chapter five, the base band signal process of CDMA base station simulator system is introduced, including channel coding and decoding, interleave and disinterleave, PN sequence generator, orthogonal spread spectrum and quadrature Spreading, scrambling code, power control, digital forming filter, the capture and track of PN code, dispreading and demodulation, etc. Some FPGA design graphic and waveform simulation of base band transmitter module is given and realization algorithm of base band receiver is discussed in detail.

第五章介绍了CDMA基站仿真系统的基带信号处理过程，包括信道编译码、交织与去交织、PN码发生器、正交扩频与四相扩频、扰码、功率控制、数字成形滤波器、PN码的捕获与跟踪、解扩与解调等，并给出了基带发射机模块的部分FPGA设计原理图和波形仿真，详细论述了基带接收机模块的实现算法。

Based on the fact that the interferences after dispreading have been suppressed and the additive noises on different antennas were uncorrelated.

基于智能天线阵的波达方向估计不仅可以用于空间滤波和波束赋形，而且可以用于对目标的测向、定位与跟踪。

The present invention discloses a variable bit spectrum spreading method and a corresponding novel dispreading method based on BP iteration interpretation method.

本发明公开了一种提供一种变码扩频方法、以及提供相应的基于BP迭代译码方法的新解扩方法。

Based on the idea of SOC, this receiver merges some function modules in a FPGA, such as digital downconverter, digital matched filter, digital dispreading and demodulation, demodulation and auto frequency control.

基于片上系统的设计思想，该接收机整合了数字下变频器、数字匹配滤波器、数字解调解扩、自动频率控制等功能模块。

Base on the results computed by the Discrete Fourier Transform in demodulation and dispreading, the scheme can estimate accurately the parameters such as frequency, amplitude and initial phase of single tone jamming by analyzing two spectra lines having higher energy than other.

提出了一种精确估计多载波扩频系统中单音干扰参数的新方法，利用解调解扩中离散傅里叶变换的计算结果，通过选取其中能量最大的两条谱线进行分析，能够对单音干扰的频率、振幅以及初始相位等参数进行精确的估计。

The dispreading module is expressed through a bidirectional chart of a given nonlinear combination sequence. The bidirectional chart is optimized and the information data is decoded with a BP iteration method. The new system has better capability as the new system takes the interrelation between the information bits into consideration.

解扩模块通过给出非线性组合序列的双向图表达，优化双向图，用BP迭代方法来解得信息数据，由于新系统考虑了信息比特之间的相互关系，因此新系统有更好的性能。

For a given dispreading distance,the widths of the two spectrum regions increase until overlay when second-order dispersion approaches zero.

对给定的传输距离，随着光纤向零色散附近靠近，两个频谱区谱宽增加直到相互重叠。

Analyzing the Ergodicity of Aperiodic Markov Chain by C language;2. Recurrent, ergodicity properties for an extended birth-death minimal Q-process;3. In the end,a special experiment is implemented according to actual applications,using pseudorandom code ergodicity instead of related dispreading in se.

结合实际应用进行了专题试验，采用了一种用伪码遍历代替相关解扩进行角误差信号搜索的方法，并对伪码的搜索、捕获和跟踪的实现过程进行了详细设计，实现了扩频信号角误差信号的搜索和跟踪功能。

The receiver can effectively eliminate distortion caused by phase offset of the carrier using quadrature subchannel information for intersect data dispreading.

通过同相、正交支路进行交叉混合数据解扩，能有效消除载波相位偏移对系统性能的影响。

The large area of desert without Vegetation cover is widely distributed in Minqin County and its vicinity, which makes up a region of high temperature and low pressure owing to the desert where significant air pressure gradient is raised with cold high pressure from the west Siberia dispreading towards the south of China.

民勤境内及其周围沙漠广布，且大面积沙漠裸露，易形成以沙漠为中心的高温低压区，与西西伯利亚向东南方向扩散的冷高压形成明显的气压梯度。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。