通信系统

Thus, in OFDM communication sytems, carrier frequency offset must be estimated and compensated at the receiver to minimize the effects of intercarrier interference and maintain orthogonality.

因此，在正交频分复用通信系统中，接收信号必须进行频率偏移估计和补偿来减小载波间干扰并维持子载波之间的正交性。

An efficient and dynamical communication system can provide convenient communication services freely and highly invulnerably.

这种网络无需依赖任何基础设施，移动节点可以通过自组织的方式建立动态、高效、抗毁性高的通信系统。

In broadband communication systems, such as WCDMA and OFDM, the memory effects can no longer be ignored and the performance of traditional memoryless modeling and predistortion method is seriously degraded.

在近年来迅速发展的WCDMA和OFDM等宽带通信系统中，射频功率放大器的记忆效应显著，传统的无记忆建模和预失真技术，很难获得理想的效果。

The LEO/MEO satellite constellation is the research focus of modern satellite communication system.

LEO/MEO双层卫星星座是现代卫星通信系统星座研究的热点。

The LEO/MEO satellite constellation is the research focus of modem satellite communication system.

LEO／MEO双层卫星星座是现代卫星通信系统星座研究的热点。

The modeling of dynamic Topology of inter satellite links network was designed by using Walker constellation for MEO satellite communication system.

MEO卫星通信系统星际链路网络的动态拓扑建模采用Walker星座设计。

The Constant Modulus Algorithm antenna arrays in the GSM systems are analyzed, CMA arrays can overcome the CCI from the intercells and partially overcome the ISI. The CMA is nonsensitive with the phase shift. The CMA criteria having real part and imaginary part can decreased the reliance of the sequentially temporal equalizer and carrier tracking measures

最后本文研究了CMA阵列天线在GSM移动通信系统中应用的可能性，CMA阵列可以有效地克服共道干扰CCI，部分克服码间干扰ISI，这样一种对相位不敏感的盲算法必须进行后处理，考虑复数的实部和虚部的CMA准则能够减少对后序处理的依赖程度。

The synchronous satellite is used to support some small bussinesses in the time with low business amount which nonsynchronous satellite can not cover like late at night and small hours,thus to insure the requirement of satellite communication of China with low investment cost.

本发明公开了一种中国综合卫星通信系统，它是由同步卫星和若干个非同步卫星构成，所述的非同步卫星是由中轨卫星或椭圆轨道卫星星座组成，具有区域性和时限性，即非同步卫星采用只在每天业务高峰期覆盖我国的时限区域性星座，在非同步卫星不能覆盖的低业务量时段如深夜和凌晨，可由同步卫星来支持这些小的业务量。

After transmission over single-mode fiber 20 km, the power penality is less than 2 dB.

标 签 光通信光纤无线通信系统外部调制器光载毫米波光载波抑制下行链路 optical communications radio over fiber system external modulator optical millimeter wave optical carrier suppression downstreem

But the increasement of requirement is challenging this kind of design philosoph.

如何将分散在各个子层的特性参数协调融合，以提升超宽带网络的性能，这些就对超宽带无线通信系统的设计提出了新的挑战。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。