通信系统

Digital transceiver is one of the key factors in satellite communication system.

在卫星通信系统中，数字收发信机是影响卫星通信质量的关键因素之一，而射频收发模块是这一关键因素的重要组成部分。

This paper presents a general method for satellite communication system design,modelling and simulation.

本文给出了卫星通信系统设计、建模和仿真的一般方法，重点是Ka频段卫星通信信道的建模及仿真。

Whether in civil mobile satellite communications or military satellite mobile communication systems, it will have important significance.

所以，无论是在民事卫星移动通信系统中还是在军事卫星移动通信中都有重要应用价值。

With the rapid development of communication technology , the CDMA technology has become a main technology of mobile communications system.

随着通信技术的飞速发展，CDMA技术已经成为现代移动通信系统的主流技术。

The comparison is made on the spectrum and anti-noise performance between π/4-DQPSK and QPSK under the the same channel.

4_DQPSK作为新制定的美国数字移动蜂窝通信系统的调制方式，以其高效的频谱利用率和抗衰落、抗多径效应等优点在现代通信领域具有广阔的发展前景。

Real-time chaotic secure communication system synthesize the new research achievement of nonlinear theory, cryptology and communication technology, and it will be applied widely in the field of information security.

由于实时混沌保密通信系统综合了非线性理论、密码学以及通信技术的新成果，将在信息安全中具有广阔的应用前景。

Therefore, in order to ensure the transmission quality, reliability and economical efficiency, we must master the rainfall attenuation influence of earth station setting areas accurately while the designing the earth-space satellite communication links.

因此，在设计地—空卫星通信线路时，为了保证通信系统传输质量、提高可靠性及经济性，就必须要准确地掌握地面站设置区域的降雨衰减所产生的影响。

In digital communication system,in order to ensure the data be transferred correctly,the error control mechanism is adopted.

在数字通信系统中，为保证数据传输过程的正确性，需要对通信过程进行差错控制。

Data transmission reliably with high-speed rate in execrable wireless environment is the goal of the future cellular mobile communication system.

在恶劣的移动通信环境中可靠、高速地传输数据是未来蜂窝移动通信系统的目标和要求。

Data transmission reliably with high-speed rate in execrable wireless environmentis the goal of the future cellular mobile communication system.

在恶劣的移动通信环境中可靠、高速地传输数据是未来蜂窝移动通信系统的目标和要求。

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。