查询词典 modulation

OFDM is actually one kind of multi-carrier modulation .and the main idea of OFDM is Channel will be divided into several subchannels orthogonal,and then turn High-speed data signals into parallel low-speed data-flow , modulation in each of the subchannels on transmission.

OFDM技术实际上是多载波调制的一种。其主要思想是：将信道分成若干正交子信道，将高速数据信号转换成并行的低速子数据流，调制到在每个子信道上进行传输。

The most popular solution to this question is using group adaptive modulation system, and usually group modulation type is decided by the subcarrier which has the worst channel information.

一个最常见的解决方法就是使用group adaptive系统，而通常决定group modulation type的方法都是使用最差的subcarrier的通道资讯。

The modulation port is implemented as a differential input, allowing the modulation control voltage and laser outputs to use different grounds.

调整港口实行差额作为投入，使电压调节和控制激光输出用不同的理由。

As thebiggest hydropower station of two-row placed units in the world, LijiaxiaHydropower Stationinstalled capacity 1600(4×400MWof Yellow River upstreamis the chief station for hump modulation and frequency modulation in northwest area.

李家峡水电站是目前世界上最大的双排机水电站，装机1600(4×400)MW，是西北电网中的骨干调频、调峰电厂。

Finally both SNR and slope of modulation transfer spectra of I2 with different absorption length were compared experimentally while I2 cell temperature was held at -15 ℃. The results of comparison showed that modulation transfer spectra was optimal at three-pass (120 cm).

实验上比较了碘池温度为-15 ℃时一倍程(40 cm)，二倍程(80 cm)，三倍程(120 cm)和四倍程(160 cm)的光谱信号信噪比和谱线中心斜率，得到三倍程时信号信噪比和谱线中心斜率为最大，估算得到相应的激光稳频精度为9×10-14(1 s积分时间)。

D dissertation. Based on GPS C/A code signal structure and performance characteristics, traits of aiming interference and jammer are analyzed. The best interference way is that wideband interference of uniform spectrum is made from wideband saw tooth frequency modulation and narrowband frequency modulation.

根据GPS的易受干扰的C/A码信号的特点，分析了对GPS的C/A码的瞄准式干扰、阻塞式干扰及相关干扰的特性，分析得知对GPS的C/A码的最佳干扰是锯齿宽带调频和噪声窄带调频相结合的均匀频谱宽带干扰。

This controller integrates pulse width modulation and pulse density modulation together,and can easily change between the two modulations.

该设计集成了脉冲宽度调制和脉冲密度调制两种调制方式，并可以在两者间切换。

Combined with the adaptive modulation and coding technology, this algorithm reallocates the residual power by effectively utilizing the discrete modulation orders according to the different prioriti es of sub-channels under the limitation of quality of service over the block fading channel.

在满足服务质量要求的前提下充分利用星座图尺寸的离散性，将残余功率按照各子信道的不同优先级进行二次分配，并结合自适应调制编码技术改善低信噪比时的系统吞吐量。

The transmitter has a physical layer transmitter for receiving data, formatting the received data into packets transmitting the packets and retransmitting packets in response to failure to receive a corresponding acknowledgment for a given packet; an acknowledgment receiver for receiving the corresponding acknowledgment; and an adaptive modulation and coding controller for collecting retransmission statistics and adjusting the particular data encoding/modulation using the collected statistics.

该发射器处的一物理层发射器是接收数据且将该接收到的数据格式化成具有一特殊编码/数据调制的数个分组。该物理层发射器包含n个信道，以发所述分组及相应未接收到相对应一给定分组的一相对应确认信息而再次发送分组。该发射器中的一适应性调制及编码控制器是收集再次发送的统计且使用该收集到的统计来调整该特殊编码/数据调制。该接收器具有一物理层n-信道接收器，以接收所述分组。

Residual amplitude modulation in electro-optical phase modulators results in unequal amplitude of modulation sidebands.

激光经电光相位调制后，由于剩余幅度调制的存在造成调制边带幅度不相等。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。