phase modulated signal

简明释义

掂信号

英英释义

例句

1.A phase modulated signal is essential for modern digital communication techniques.

在现代数字通信技术中，相位调制信号是必不可少的。

2.The use of a phase modulated signal allows for better performance in noisy environments.

使用相位调制信号可以在嘈杂环境中获得更好的性能。

3.In telecommunications, a phase modulated signal can be used to transmit voice and video with minimal interference.

在电信中，相位调制信号可用于以最小干扰传输语音和视频。

4.The transmission of data over long distances often utilizes a phase modulated signal to enhance signal integrity.

在长距离数据传输中，通常使用相位调制信号来增强信号完整性。

5.Engineers often analyze the characteristics of a phase modulated signal to improve communication systems.

工程师们经常分析相位调制信号的特性，以改善通信系统。

作文

In the realm of communication systems, various techniques are employed to transmit information efficiently and effectively. One such technique is known as phase modulated signal, which plays a crucial role in modern digital communication. To understand its significance, we must first delve into what phase modulation entails and how it differs from other modulation methods.Phase modulation (PM) involves varying the phase of a carrier wave in accordance with the information signal being transmitted. Unlike amplitude modulation (AM), which alters the strength of the signal, or frequency modulation (FM), which changes the frequency, PM focuses solely on modifying the phase angle of the carrier wave. This unique approach allows for more efficient use of bandwidth, making it particularly advantageous for high-frequency communications.A phase modulated signal can be visualized as a sine wave where the phase shifts at specific intervals, corresponding to the data being sent. For instance, when transmitting binary data, a phase shift might represent a '0' or a '1', depending on the encoding scheme used. The result is a signal that maintains a constant amplitude while its phase varies, providing robustness against certain types of interference and noise.One of the key benefits of using phase modulated signals is their resilience to signal degradation. In environments where noise and interference are prevalent, such as urban areas or during severe weather conditions, PM can maintain data integrity better than AM or FM. This characteristic makes it a preferred choice in satellite communications and mobile telephony, where maintaining a clear signal is paramount.Moreover, phase modulation is integral to many advanced technologies, including spread spectrum techniques. These methods spread the signal over a wider bandwidth, further enhancing resistance to interference and allowing multiple users to share the same frequency band without significant degradation in performance. The application of phase modulated signals in such technologies illustrates their versatility and importance in the ever-evolving landscape of telecommunications.In practical applications, digital modulation schemes like Quadrature Phase Shift Keying (QPSK) and Differential Phase Shift Keying (DPSK) utilize phase modulated signals. QPSK, for example, encodes two bits of information per symbol by shifting the phase of the carrier signal among four distinct states. This efficiency in data transmission is vital for meeting the increasing demand for higher data rates in various applications, from streaming services to online gaming.In conclusion, the concept of a phase modulated signal is fundamental to understanding modern communication systems. Its ability to convey information through phase variations, while offering resilience against noise and interference, makes it an essential tool in the field of telecommunications. As technology continues to advance, the importance of phase modulation will only grow, paving the way for faster, more reliable communication methods that meet the demands of our increasingly connected world.

在通信系统的领域中，采用各种技术来高效而有效地传输信息。其中一种技术被称为相位调制信号，在现代数字通信中发挥着至关重要的作用。要理解其重要性，我们必须首先深入了解相位调制的含义以及它与其他调制方法的区别。相位调制（PM）涉及根据所传输的信息信号改变载波波的相位。与振幅调制（AM）不同，后者改变信号的强度，或者频率调制（FM），后者改变频率，PM仅专注于修改载波波的相位角。这种独特的方法允许更有效地使用带宽，使其在高频通信中尤其具有优势。可以将相位调制信号可视化为一个正弦波，其中相位在特定间隔内变化，以对应所发送的数据。例如，在传输二进制数据时，相位变化可能表示“0”或“1”，具体取决于使用的编码方案。结果是一个保持恒定幅度的信号，而其相位发生变化，从而提供对某些类型干扰和噪声的鲁棒性。使用相位调制信号的主要好处之一是其对信号降解的抵抗力。在噪声和干扰普遍存在的环境中，例如城市地区或恶劣天气条件下，PM能够比AM或FM更好地保持数据完整性。这一特性使其成为卫星通信和移动电话的首选，因为在这些领域中保持清晰信号至关重要。此外，相位调制在许多先进技术中也是不可或缺的，包括扩频技术。这些方法将信号扩展到更宽的带宽，进一步增强对干扰的抵抗力，并允许多个用户共享同一频段，而不会显著降低性能。相位调制信号在此类技术中的应用说明了其在快速发展的电信领域中的多功能性和重要性。在实际应用中，像四相位移键控（QPSK）和差分相位移键控（DPSK）这样的数字调制方案利用了相位调制信号。例如，QPSK通过在四个不同状态之间移动载波信号的相位来每个符号编码两个比特的信息。这种数据传输的效率对于满足各种应用中对更高数据速率的日益增长的需求至关重要，从流媒体服务到在线游戏。总之，相位调制信号的概念对理解现代通信系统至关重要。它通过相位变化传达信息的能力，同时对噪声和干扰提供抵抗力，使其成为电信领域的基本工具。随着技术的不断进步，相位调制的重要性只会增加，为满足我们日益互联的世界的需求铺平道路，提供更快、更可靠的通信方法。