time selective fading

简明释义

时间选择性衰落

英英释义

例句

1.The impact of time selective fading 时变衰落 is more pronounced in urban environments due to multipath propagation.

由于多路径传播，时变衰落 time selective fading 的影响在城市环境中更为明显。

2.Research on time selective fading 时变衰落 helps improve the performance of mobile networks.

关于时变衰落 time selective fading 的研究有助于提高移动网络的性能。

3.Engineers must consider time selective fading 时变衰落 when designing robust communication systems.

工程师在设计稳健的通信系统时必须考虑到时变衰落 time selective fading。

4.To mitigate time selective fading 时变衰落, adaptive equalization techniques are often employed.

为了减轻时变衰落 time selective fading，通常采用自适应均衡技术。

5.In wireless communication, time selective fading 时变衰落 can cause significant variations in signal strength.

在无线通信中，时变衰落 time selective fading 可能导致信号强度的显著变化。

作文

In the field of wireless communication, one of the significant challenges faced is the phenomenon known as time selective fading. This term refers to the variations in signal strength that occur over time due to changes in the environment and the movement of objects within it. When a signal travels through the air, it can be affected by various factors such as buildings, trees, and even the weather. These obstacles cause the signal to reflect, scatter, and diffract, leading to fluctuations in the received signal strength at different times. Understanding time selective fading is crucial for engineers and researchers who design communication systems, as it directly impacts the quality and reliability of wireless transmissions.To grasp the concept of time selective fading, it is helpful to consider how wireless signals are transmitted. A transmitter sends out a signal that travels through the air to a receiver. However, if there are moving objects or changes in the environment, the signal can take multiple paths to reach the receiver. This phenomenon is known as multipath propagation. As the signal arrives via different paths, they can interfere with each other, causing constructive or destructive interference. This interference can result in varying signal strengths at the receiver, which is where time selective fading comes into play.The impact of time selective fading can be particularly pronounced in mobile communication systems, where users are constantly on the move. For instance, when a person is driving in a car, the signal they receive can change rapidly as they pass by buildings or other obstacles. This can lead to dropped calls or poor quality in voice and data services. To mitigate these effects, engineers employ various techniques, such as diversity schemes and equalization methods, to enhance the reliability of the communication link.Another important aspect of time selective fading is its correlation with the Doppler effect. When a signal source moves relative to the receiver, the frequency of the received signal can shift, causing further variations in the signal strength. This relationship between the movement of the transmitter or receiver and the fading characteristics is essential for predicting how a wireless system will perform under different conditions.In conclusion, time selective fading is a critical concept in understanding the challenges of wireless communication. It describes how signal strength can fluctuate over time due to environmental changes and the movement of objects. By recognizing the implications of this phenomenon, engineers can develop more robust communication systems that can maintain reliable connections, even in dynamic environments. The ongoing research in this area continues to improve our ability to combat the adverse effects of time selective fading, ensuring that wireless technology remains efficient and effective for users around the world.

在无线通信领域，一个重要的挑战是被称为时变衰落的现象。这个术语指的是由于环境变化和物体移动而导致的信号强度随时间变化。当信号通过空气传播时，它会受到建筑物、树木甚至天气等各种因素的影响。这些障碍物会导致信号反射、散射和衍射，从而导致接收信号强度在不同时间的波动。理解时变衰落对设计通信系统的工程师和研究人员至关重要，因为它直接影响无线传输的质量和可靠性。为了掌握时变衰落的概念，考虑无线信号的传输方式是有帮助的。发射器发送一个信号，该信号通过空气传播到接收器。然而，如果有移动的物体或环境变化，信号可能会通过多条路径到达接收器。这种现象被称为多径传播。当信号通过不同路径到达时，它们可能会相互干扰，导致建设性或破坏性的干扰。这种干扰可能导致接收器的信号强度变化，这就是时变衰落的作用所在。时变衰落的影响在移动通信系统中尤为明显，因为用户不断移动。例如，当一个人开车时，他们接收到的信号可能会迅速变化，因为他们经过建筑物或其他障碍物。这可能导致通话中断或语音和数据服务质量差。为了减轻这些影响，工程师采用各种技术，例如多样性方案和均衡方法，以增强通信链路的可靠性。时变衰落的另一个重要方面是其与多普勒效应的相关性。当信号源相对于接收器移动时，接收信号的频率可能会发生偏移，导致信号强度的进一步变化。发射机或接收机的运动与衰落特征之间的这种关系对于预测无线系统在不同条件下的性能至关重要。总之，时变衰落是理解无线通信挑战的关键概念。它描述了由于环境变化和物体移动，信号强度如何随时间波动。通过认识到这一现象的影响，工程师可以开发出更强大的通信系统，即使在动态环境中也能保持可靠的连接。该领域的持续研究不断提高我们抵御时变衰落不利影响的能力，确保无线技术对全球用户保持高效和有效。