necessary bandwidth

In accordance to the characteristics of satellite communication system, it is necessary to limit the bandwidth of the signal spectrum and to decrease the ISI.

针对卫星通信信道的特点，为了节约频谱资源，需要对发射信号进行带限；

The result indicates that it is necessary to expand the bandwidth because the bandwidth of standard Ethernet is not big enough to meet the needs of video service.

研究结果表明，标准以太网的带宽不足以满足视频业务，需要拓展带宽。

Occupied bandwidth ( OB) and necessary bandwidth ( NB) are discussed, and it is emphasized that the research on "breaking through Nyquist rate" must be done in the sense of NB.

提出占用带宽和必要带宽的概念，指出突破Nyquist速率的研究必须基于必要带宽才有意义。

It is often necessary to fairly allocate bandwidth among services with different requirements in high-speed packet switching circuits while meeting their QoS parameters.

高速包交换电路常常需要为各种不同要求的服务公平地分配带宽，在公平分配带宽的同时还需要满足这些服务的服务质量（QoS）参数。

A group of curve to show the necessary bandwidth via channel load levels is given for typical microwave communication systems.

同时对一些典型的微波通信系统，给出了频带宽度与话路负载的关系曲线。

When the measured signal has a very wide frequency chart especially in the fast signal measurement field, in order to easily satisfy the high fidelity requirement that Bandwidth of Long Transmission Line, it is necessary for expanding the Bandwidth of Long Transmission Line.

当被测量信号具有很宽的频谱，尤其是在快脉冲信号测量中，为了测量数据在传输过程中满足高保真度的要求，必须对远距离传输线进行带宽扩展。

While high-speed serial port broke I/ O bottleneck to provide necessary bandwidth and expansion capability, it is an important technique used in high backplane interconnection and also reduces the cost of entire system.

本文采用高速串行接口技术可以突破I/O瓶颈，提高需要的带宽和增强扩展能力，降低总体系统成本，是高速通信设备中的重要的背板互连技术。