在如今这个信息化时代，手机已成为人们生活中必不可少的通讯工具。而提到手机，人们自然会想到它的天线。那么，为什么我们现在几乎看不到手机外部的天线了呢？这都要归功于调制技术的发展。
调制技术，如同给电波插上了翅膀，使得通信过程更加高效和稳定。它是一种对信号源的信息进行处理，使其适合传输形式的过程。通过调制技术，发射信号的频率得以提高，从而减少手机终端中接收天线的长度。如今，手机中的天线都可以内置到手机中，使得外观更美观，携带更方便。
具体来说，调制技术在通信过程中的应用有很多，如匹配信道特性、减小天线尺寸、提高辐射效率、实现信道的多路复用等。这些技术的发展使得手机通信更加便捷，同时提高了通信系统的性能。
在3G/4G/5G通信中，数字调制技术QAM（Quadrature Amplitude Modulation，正交幅度调制）应用最为广泛。QAM是一种在两个正交载波上进行幅度相位调制的调制方式，能够提高通信速率。通过QAM调制，每个符号可以传输4、6、8、10等不同数量的信息，使得通信过程更加高效。
然而，高阶调制方案对噪声和干扰的适应性相对较差。较高阶的调制方式对接收双方的器件要求更高，同时对环境的要求也更严格。因此，在实际应用中，需要根据具体情况选择合适的调制技术。
总之，调制技术在手机通信中起到了至关重要的作用。通过不断发展与创新，调制技术让手机天线变得更加隐形，使得通信过程更加便捷、高效。未来，随着科技的进步，我们有理由相信，通信技术将更好地服务于人类社会。
英文翻译：
News Title: Uncovering the Mysteries of Mobile Phone Antennas: How Modulation Technology Makes Communication More Convenient?
Keywords: Mobile phone antennas, modulation technology, communication convenience
News Content:
In today’s information age, mobile phones have become an indispensable communication tool in people’s lives. When it comes to mobile phones, people naturally think of their antennas. So, why can’t we see the external antennas on mobile phones anymore? This is all thanks to the development of modulation technology.
Modulation technology, like giving radio waves wings, makes communication processes more efficient and stable. It is a process of processing signal source information to make it suitable for transmission. Through modulation technology, the frequency of the transmitted signal is increased, thereby reducing the length of the receiving antenna in mobile terminal devices. Nowadays, antennas in mobile phones can be built-in, making the appearance more attractive and portable more convenient.
Specifically, modulation technology is applied in the communication process in many ways, such as matching channel characteristics, reducing antenna size, improving radiation efficiency, and implementing channel multiplexing. The development of these technologies makes mobile communication more convenient while improving the performance of communication systems.
In 3G/4G/5G communication, digital modulation technology QAM (Quadrature Amplitude Modulation) is the most widely used. QAM is a modulation method that performs amplitude and phase modulation on two orthogonal carriers, enabling higher communication rates. Through QAM modulation, each symbol can transmit different amounts of information, ranging from 4 to 10, making the communication process more efficient.
However, higher-order modulation schemes are relatively less adaptable to noise and interference. Higher-order modulation requirements for receiving devices are higher, and the environment is also more stringent. Therefore, in practical applications, it is necessary to choose appropriate modulation technologies according to specific circumstances.
In conclusion, modulation technology plays a crucial role in mobile communication. With the continuous development and innovation of technology, mobile phone antennas have become more invisible, making the communication process more convenient and efficient. Looking to the future, as science and technology advance, there is reason to believe that communication technology will better serve society.
【来源】https://www.ithome.com/0/743/744.htm
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