实际GMSK数据传输

中文字数:5168,中文页数:10  英文字数:3032页数:11

Introduction

 The proliferation of computers in today's society has increased the demand for transmission of data over wireless links. Binary data, composed of sharp "one to zero" and "zero to one" transitions, results in a spectrum rich in harmonic content that is not well suited to RF transmission. Hence, the field of digital modulation has been flourishing. Recent standards such as Cellular Digital Packet Data (CDPD) and Mobitex*specify Gaussian filtered Minimum Shift Keying (GMSK) for their modulation method.

 GMSK is a simple yet effective approach to digital modulation for wireless data transmission. To provide a good understanding of GMSK, we will review the basics of MSK and GMSK, as well as how GMSK is implemented in CDPD and Mobitex systems.
 
 GMSK modems reduce system complexity, and in turn lower system cost. There are, however, some important implementation details to be considered. This paper will cover some of these details, focusing on interfacing a single chip baseband modem to the IF/RF section of a "typical" FM radio topology.

引言

 随着计算机的普及，数据传输在当今社会的需求也在不断的增加，进而出现了传输数据的无线链路。二进制数据组成的“一零”和“零一”的过渡，产生了丰富的谐波频谱内容，这并不适合射频传输。因此，数字调制领域已得到了蓬勃的发展。从最近的标准可以看到，如蜂窝数字分组数据（CDPD）和Mobitex*指定高斯滤波最小频移键控（GMSK）的调制方法就是数字调制领域的先进技术。
 
 GMSK是一种简单而有效的数字调制的无线数据传输办法。为了使我们更好的理解GMSK数字调制的方法，我们会分析MSK和GMSK的基本理论知识，以及如何运用GMSK数字调制方法来实现CDPD和Mobitex系统。
 
 GMSK调制解调器降低了系统的复杂性，从而降低系统的成本。但是，也有一些重要的实施细则需要加以考虑。本文将涵盖其中的一些细节，把重点放在“典型”调频收音机拓扑接口的单芯片中的基带调制解调器的中频/射频部分。
 

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