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1.前言: 现在,在移动无线通信方式中,几乎所有的场合都采用FM制。但是最近一个时期,由于编解码技术的迅速发展,各种高效率调制解调器的研究和社会发展的需要,使得采用SCPC(Single—ChannelPer—Carrier)方式的数字式移动无线通信的实现有了可能性。本文要叙述为达此目的而研制的一种数字无线通信用的调制解调器。在考虑无线通信用的调制解调器时,须注意以下一些重要事项: (1).调制波的包络为恒定幅度。 (2).发送频谱要窄。 (3).解调信号里无波形效应(眼图
1. Introduction: Nowadays, FM is used in almost all occasions in mobile wireless communication. However, due to the rapid development of codec technology and the demand of various high-efficiency modems and social development in recent days, it is possible to realize the digital mobile wireless communications using SCPC (Single-Channel Per-Carrier). This article describes a modem for digital wireless communication developed for this purpose. When considering modems for wireless communications, some important things to note are as follows: (1) The envelope of the modulated wave is constant amplitude. (2) to send the spectrum should be narrow. (3). No waveform effect in the demodulated signal (eye diagram