查询词典 frequency channel

Firstly, the design and implementation of Analog Channel in CR system is introduced, which takes on the responsibility of power control, dynamic frequency switch, and receive terminal for authorized user detection.

本文首先在认知无线电实验系统中设计并实现了模拟通道，其任务包括执行功率控制和动态频谱切换的功能，以及作为授权用户检测的接收通道。

The model selection and parameters optimization for analog channel were discussed. The Laplace model and the Gauss model in common used in the video frequency were researched.

讨论了模拟信道的模型选取和参数优化，研究了视频序列中常用的Laplace模型和Gauss模型，提出了一种带校正系数的虚拟相关信道参数估计方法，验证了虚拟相关信道更接近残差数据的真实分布。

With the change of the interval, analog output channel outputs variant voltage to frequency converter that controls the speed of the motor.

根据载荷设定值的大小，系统根据等比关系将其模糊化成几个区间，并确定当前采集到的载荷的区间号，根据区间的变化赋予采集卡的模拟输出通道一定电压输出到变频器，最终控制电动机的转速，使整个加载过程保持平稳。

"In FDM (typically used for analog signals) the channel is subdivided into subchannels, each with a different frequency width that is assigned to a specific signal."

在分频多任务，信道切割成次信道，每个信道具有不同的频率宽度，指定给特定的讯号。

In accordance with the contradictory between the antinoise ability and detection accuracy, according to the characteristics that the noise is uncorrelation among different frequency channels and the signal has relatively more energy than the noise in each channel, the mutual-energy cross technique is proposed.

针对检测中抗噪能力和检测精度的矛盾，根据噪声在分解的每个频道间彼此互不相关，而信号相对噪声在每个频道却有较大能量的特点，提出了互能量交叉的噪声抑制方法。

In this chapter, we use a simple method to show that if the ratio of the channel traffic to the number of frequiency bins is held constant, the unslotted system can provide the same throughput as the slotted system, when the number of frequency bins approach infinity.

在这一章中，我们还采用了一种简便的方法证明了当信道业务量和频率槽数均趋于无穷，且它们之比恒定时，时槽系统与非时槽系统性能一致，同步系统的最大吞吐量是异步系统的两倍。

Firstly it describes the development ,basic principle and application and propagation characteristic of mobile channel , then investigates the system structure of DAB transmitter and receiver separately and the key technology of realization of the digital audio broadcast system.And then discusses the system component of FFT －the demodulation module of OFDM .The 409- points FFT module employs a radix-4 decimation-in-frequency algorithm, includes arithmetic element , read and write address element ,twiddle factor element and control element , is realized by FPGA. In the end , the result is verified in the matlab .

首先概述了OFDM的发展、基本原理和应用以及移动信道的传播特性，接着分别研究了数字音频广播接收机和发射机的系统结构，以及数字音频广播系统实现的关键技术，然后详细论述了OFDM解调模块FFT的系统结构，主要研究了4096点FFT采用基－4按频率抽取实现的算法，整个FFT模块包括了运算单元、读写地址单元、旋转因子单元以及控制单元，并且在FPGA中进行了硬件实现，并在matlab环境下对结果进行了验证。

However, the fact that one can "layer" multiple channels on the same frequency band means that the system spectrum utilization for a multi-channel CDMA system can be very good.

但是，实际中可以设置多个通道在同一频率带宽中，意味着一个多通道CDMA系统的频谱利用率可以相当好。

Because it is more superior than that of the binary scale FSK and OOK that the binary scale moves the looks key and accuses of the system in resisting noise performance and channel communication frequency band utilization ratio etc., widely used in digital communication.

二进制移相键控方式是受键控的载波相位按基带脉冲而改变的一种数字调制方式。由于二进制移相键控系统在抗噪声性能及信道通信频带利用率等方面比二进制FSK及OOK的优越，因而被广泛应用于数字通信中。

Additional LFE channel low-frequency reinforcement came from two stacks of three 700-HP subwoofers, in cardioid formation.

另外增强型低频通道扩声由2组700-HP组成，每组3只呈心性指向组合。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。