code division multiple access

简明释义

码分多址

英英释义

例句

1.Many modern smartphones support code division multiple access technology.

许多现代智能手机支持码分多址技术。

2.The mobile network uses code division multiple access to allow multiple users to share the same frequency band.

移动网络使用码分多址技术，使多个用户能够共享相同的频带。

3.In code division multiple access, users can transmit data simultaneously without interference.

码分多址允许用户同时传输数据而不会互相干扰。

4.With code division multiple access, each call is assigned a unique code for better signal separation.

通过码分多址，每个通话被分配一个唯一的代码，以便更好地分离信号。

5.The efficiency of code division multiple access makes it ideal for cellular networks.

由于码分多址的高效性，它非常适合用于蜂窝网络。

作文

In the world of telecommunications, efficient use of the available spectrum is crucial for supporting the ever-increasing demand for wireless communication. One of the most innovative techniques that have emerged in this field is code division multiple access. This method allows multiple users to share the same frequency channel simultaneously without interference, which is essential for modern communication systems. To understand how code division multiple access works, we need to delve into its fundamental principles and applications.Code division multiple access, often abbreviated as CDMA, is a technology that uses unique codes to differentiate between different users. Each user is assigned a distinct code, which is used to modulate their signal. When these signals are transmitted over the same frequency, they can be separated at the receiver's end using the corresponding codes. This technique not only increases the capacity of the network but also enhances the quality of the communication by reducing the chances of interference.The concept behind code division multiple access can be compared to a group of people speaking different languages in the same room. Even though they are all communicating at once, each person understands only their own language. In a similar manner, CDMA allows multiple signals to coexist on the same frequency, as long as they are encoded with different spreading codes.One of the significant advantages of code division multiple access is its ability to provide secure communication. Since the signals are spread across a wide bandwidth and are encoded with unique keys, it becomes challenging for unauthorized users to intercept or decipher the communication. This feature is particularly valuable in military and government applications where confidentiality is paramount.Moreover, code division multiple access has been widely adopted in various mobile communication standards, including 3G and some implementations of 4G networks. The technology has proven to be highly efficient in managing the growing number of mobile users while maintaining high-quality service. For instance, in densely populated urban areas, where many users are trying to connect to the network simultaneously, CDMA can manage the traffic effectively without causing significant degradation in service quality.Despite its numerous benefits, code division multiple access is not without challenges. One of the primary concerns is the issue of power control. In a CDMA system, users who are farther from the base station may require more power to maintain a good connection. If power levels are not properly managed, it can lead to near-far problems, where closer users overpower the signals of those farther away. This requires sophisticated algorithms and mechanisms to ensure that all users receive adequate service.In conclusion, code division multiple access represents a significant advancement in the field of telecommunications. Its ability to allow multiple users to share the same frequency channel efficiently makes it an invaluable tool in today's wireless communication landscape. As technology continues to evolve, the importance of CDMA will likely grow, enabling even more innovative applications and services. Understanding code division multiple access is essential for anyone interested in the future of communication technology, as it lays the groundwork for the next generation of wireless systems.

在电信领域，有效利用可用频谱对于支持日益增加的无线通信需求至关重要。在这个领域中，出现了一种创新技术，即码分多址。这种方法允许多个用户同时共享相同的频率通道而不产生干扰，这对于现代通信系统是必不可少的。要理解码分多址的工作原理，我们需要深入探讨其基本原则和应用。码分多址，通常缩写为CDMA，是一种使用唯一代码来区分不同用户的技术。每个用户被分配一个独特的代码，用于调制他们的信号。当这些信号在相同频率上发射时，它们可以在接收端通过相应的代码进行分离。这种技术不仅提高了网络的容量，还通过减少干扰的可能性来增强通信质量。码分多址背后的概念可以与一群人在同一个房间里说不同语言进行比较。尽管他们都在同时交流，但每个人只理解自己的语言。以类似的方式，CDMA允许多个信号在同一频率上共存，只要它们用不同的扩展代码进行编码。码分多址的一个显著优点是能够提供安全的通信。由于信号在宽带宽上扩展，并且使用独特的密钥进行编码，因此未经授权的用户拦截或解密通信变得非常困难。这个特性在军事和政府应用中尤为重要，因为保密性至关重要。此外，码分多址已被广泛采用于各种移动通信标准，包括3G和一些4G网络的实现。这项技术已被证明在管理不断增长的移动用户数量的同时保持高质量服务方面非常有效。例如，在人口稠密的城市地区，许多用户试图同时连接到网络时，CDMA可以有效管理流量，而不会导致服务质量显著下降。尽管有许多好处，码分多址也面临挑战。主要关注的问题之一是功率控制。在CDMA系统中，距离基站较远的用户可能需要更多的功率才能维持良好的连接。如果功率水平未得到适当管理，可能会导致近远问题，即较近的用户会压倒较远用户的信号。这需要复杂的算法和机制，以确保所有用户都能获得足够的服务。总之，码分多址代表了电信领域的重要进步。它能够有效地让多个用户共享相同的频率通道，使其成为当今无线通信环境中不可或缺的工具。随着技术的不断发展，CDMA的重要性可能会进一步增长，从而使更多创新的应用和服务成为可能。理解码分多址对于任何对通信技术未来感兴趣的人来说都是至关重要的，因为它为下一代无线系统奠定了基础。