phase-shift keying

简明释义

相移键控

英英释义

例句

1.The use of phase-shift keying allows for more efficient transmission of data over radio waves.

使用相位键控可更高效地通过无线电波传输数据。

2.Many modern modems utilize phase-shift keying to achieve higher data rates.

许多现代调制解调器利用相位键控来实现更高的数据传输速率。

3.In digital communication, phase-shift keying is used to encode data by varying the phase of the carrier signal.

在数字通信中，相位键控用于通过改变载波信号的相位来编码数据。

4.The simplicity of phase-shift keying makes it a popular choice for many wireless applications.

由于相位键控的简单性，它在许多无线应用中成为流行选择。

5.In satellite communications, phase-shift keying helps in reducing errors during data transmission.

在卫星通信中，相位键控有助于减少数据传输中的错误。

作文

In the realm of digital communication, various modulation techniques are employed to transmit data efficiently and reliably. One such technique is phase-shift keying, which plays a crucial role in modern telecommunications. Understanding phase-shift keying is essential for anyone interested in the field of communications, as it provides a foundation for more advanced concepts.Phase-shift keying (PSK) is a form of digital modulation that conveys data by changing the phase of a carrier wave. This technique allows for the transmission of information over radio waves, making it a vital component in systems like Wi-Fi, satellite communication, and mobile networks. The basic idea behind phase-shift keying is to encode data into the phase of the signal rather than the amplitude or frequency, which can be affected by noise and interference.The simplest form of phase-shift keying is Binary PSK (BPSK), where two different phases represent binary digits 0 and 1. For instance, a phase shift of 180 degrees might represent a binary '1', while 0 degrees represents a binary '0'. This method is effective and straightforward but has limitations in terms of data rate. To overcome this, variations like Quadrature PSK (QPSK) were developed, which use four phases to encode two bits per symbol, effectively doubling the data rate without requiring additional bandwidth.One of the main advantages of phase-shift keying is its robustness against noise. Since the information is carried in the phase of the signal, it can maintain integrity even in challenging conditions. This characteristic makes it particularly suitable for wireless communication where signals may be subject to various forms of interference. Additionally, phase-shift keying can achieve high spectral efficiency, meaning it can transmit more data within a given bandwidth compared to other modulation schemes.However, phase-shift keying also has its challenges. One significant issue is the requirement for precise synchronization between the transmitter and receiver. Any phase misalignment can lead to errors in data interpretation. To mitigate this, systems often incorporate complex algorithms and techniques, such as phase-locked loops, to ensure accurate demodulation of the received signal.In conclusion, phase-shift keying is a fundamental concept in digital communication that enables efficient and reliable data transmission. Its ability to encode information through phase changes makes it a preferred choice for many modern communication systems. As technology continues to evolve, understanding phase-shift keying will remain crucial for engineers and professionals working in the telecommunications industry. By grasping the principles and applications of phase-shift keying, one can appreciate its significance in facilitating seamless communication in our increasingly connected world.

在数字通信领域，各种调制技术被用于高效和可靠地传输数据。其中一种技术是相位键控，它在现代电信中发挥着至关重要的作用。理解相位键控对任何对通信领域感兴趣的人来说都是必不可少的，因为它为更高级的概念提供了基础。相位键控（PSK）是一种数字调制形式，通过改变载波波的相位来传达数据。这种技术允许通过无线电波传输信息，使其成为Wi-Fi、卫星通信和移动网络等系统的重要组成部分。相位键控的基本思想是将数据编码到信号的相位中，而不是幅度或频率，这些可能会受到噪声和干扰的影响。相位键控最简单的形式是二进制PSK（BPSK），其中两个不同的相位代表二进制数字0和1。例如，180度的相位移可能表示二进制'1'，而0度表示二进制'0'。这种方法有效且简单，但在数据速率方面存在限制。为了克服这一点，开发了像正交PSK（QPSK）这样的变体，它使用四个相位来对每个符号编码两个比特，有效地在不需要额外带宽的情况下将数据速率加倍。相位键控的主要优点之一是其抗噪声能力。由于信息通过信号的相位传递，即使在恶劣条件下也能保持完整性。这一特性使其特别适合无线通信，因为信号可能受到各种干扰。此外，相位键控可以实现高频谱效率，这意味着它可以在给定带宽内传输比其他调制方案更多的数据。然而，相位键控也面临着挑战。一个显著的问题是发射机和接收机之间对精确同步的要求。任何相位失调都可能导致数据解释错误。为了减轻这一问题，系统通常采用复杂的算法和技术，例如锁相环，以确保对接收信号的准确解调。总之，相位键控是数字通信中的一个基本概念，使高效和可靠的数据传输成为可能。它通过相位变化编码信息的能力使其成为许多现代通信系统的首选。随着技术的不断发展，理解相位键控将继续对在电信行业工作的工程师和专业人员至关重要。通过掌握相位键控的原理和应用，人们可以欣赏到它在促进我们日益互联的世界中无缝通信的重要性。