频移键控

频移键控信号解调方法研究

A Study on the FSK Signal Digital Demodulation

频移键控（FSK）信号在通信系统的广泛应用，使其解调技术也成为一种核心技术。

As a kernel method , FSK demodulation technique is widely applied in communication systems .

以4级频移键控为核心，设计了一种用于FLEX编码的寻呼机调频中频接收电路。

A FM / IF receiver system used in FLEX pager is designed . 4 level FSK circuit is emphasized .

并把它用在以频移键控（FSK）方式调制的频分复用系统中，得到了比较理想的结果。

Also , We applied the filter to the FDM-FSK system and achieved good results .

数字调制信号分三种基本类型：多进制幅度键控MASK、多进制相移键控MPSK和多进制频移键控MFSK。

There are three basic types of digitally modulated signal : MASK , MPSK and MFSK .

本系统采用频移键控，用作DFT的方式解调，本文对抗噪性能进行了分析。

The system adopts FSK signal as modulation and DFT as demodulation . And the capability of noise rejection of DFT is discussed .

其中，硬件设计电路产生的最小频移键控MSK信号是后续GMSK等信号产生的基础。

The method to generate MSK signal is the foundation of generating the follow up GMSK signal .

以两种二进制频移键控（binarysystemfrequencyshiftkeying，2FSK）调制解调器搭建系统进行实验，验证了该方法的有效性。

Through the experiments with two systems , which based on two kinds of the binary system frequency shift keying ( 2FSK ) modems , the algorithm 's validity is tested .

在FSK（频移键控）数字接收机中，信号的解调主要以鉴频为主。

On the FSK ( Frequency Shift Keying ) digital receiver , the signal is demodulated mainly by frequency discrimination .

文章提出了采用最小频移键控（MSK）技术与调频超短波无线电技术相结合传输信号的方法。

This paper puts forward the signals transmission method combining the MSK technique with the radio technique of frequency modulated ultra short waves .

天线相关性对空时频移键控（ST-FSK）系统性能的影响

Effect of Antenna Correlation on ST-FSK System Performance

详细地介绍了空时频移键控（ST-FSK）调制解调理论和卷积码编码、维特比译码理论。

Introduced the space-time frequency shift keying and the convolutional code theory in detail .

本文研究了一种采用全数字锁相环实现频移键控FSK信号解调的新方案。

This paper discusses a method to demodulate FSK signal , on the basis of FPGA chip , by applying all - digital phase locked loop .

提出一种基于时域分析测量低频频移键控（FSK）信号频率的相位推算法，并分析了测量误差产生的原因。

This paper provided the phase deducted method in time domain to measure frequency of low FSK signal . The cause of the metrical error was analyzed .

由于最小频移键控（MSK）信号具有较为理想的功率谱特性，近年来已得到广泛关注。

In recent years , minimum shift keying ( MSK ) has gained increasing popularity as a modulation technique because of its desirable spectral properties .

多频移键控调制技术（MFSK）对信道衰落有良好的适应性，是远程水声通信的重要技术。

Multi-frequency shift keying ( MFSK ) modulation , which is suitable to fading channels , is an important technique in long-range acoustic communications .

连续相位频移键控（CPFSK）信号广泛应用于便携式移动通信系统。

The Continuous Phase Frequency Shift Keying ( CPFSK ) signaling scheme has been widely used in mobile applications .

视频信号传输采用脉冲频率调制（PFM）技术，而数据信号传输利用频移键控（FSK）技术。

In the design , the PFM ( pulse frequency modulation ) technology is used for video transmission , and the FSK ( frequency shift key ) technology is used for data transmission .

采用谱分析方法实现接收的方案，除在电子侦察接收机、MFSK（多进制频移键控）接收机或OFDM（正交频分复用）接收机中应用外，很少在常规数字接收机中使用。

Except electronic reconnaissance receiver , MFSK ( M-ary Frequency Shift Keying ) receiver , OFDM ( Orthogonal Frequency Division Multiplexing ) receiver , spectrum analysis method of receiver scheme is rarely used in conventional receiver .

在第三章中，详细介绍了有关最小频移键控调制方式的基本原理，并在第四章中给出了MSK信号生成方法及仿真实验结果。

In the third chapter , the detailed basic principles of minimum shift keying modulation is introduced , and the MSK signal generation method and simulation results are given in the fourth chapter .

研究了一种基于多进制频移键控（MFSK）调制的水声远程信息传输技术，介绍了通过谱分析进行解调的方法。

A long-range underwater acoustic information transmission technique based on Multiple Frequency Shift Keying ( MFSK ) modulation is studied , and the demodulation method based on spectrum estimation is introduced .

高斯最小频移键控（GMSK）具有极好的频谱利用率、功率效率和可以采用非相干解调等优点，已经广泛应用于无线通信系统，尤其是移动通信领域。

With the advantages of good spectrum utilization and power efficiency as well as noncoherent demodulation can be employed , GMSK ( Gaussian Minimum Shift Keying ) has been widely applied in the wireless system .

空时频移键控（ST-FSK）具有良好的抗衰落特性、较低的译码复杂性，最近正受到广泛的重视。

Recently , there has been great interest in Space-Time Frequency Shift Keying ( ST-FSK ) because it has superior performance against fading and enjoys a low decoding complexity .

介绍了简易V.23二进制频移键控（2FSK）调制解调器的工作原理、算法分析以及基于可编程器件DSP的软件设计方法。

The working principle , algorithm analysis and software design method of a simplified V.23 2 FSK modem based on DSP which is a kind of programmable chip are introduced in this article .

该文针对中程（10~30km）多载波水声通信系统提出一种非对称升余弦频移键控调制（ARC-FSK）信号。

In this paper , a new Asymmetric-Raised-Cosine Frequency Shift Keying ( ARC-FSK ) modulation signal used for the middle range multi-carrier UWA communication is proposed .

空时频移键控（ST-FSK）结合了空时分组码和频移键控的优点，在瑞利衰落信道条件下无需信道信息，可采用非相干的最大似然（ML）检测器。

Combining the advantages of space-time block codes and frequency-shift keying , space-time frequency-shift keying ( ST-FSK ), which does not require any channel state information at the transmitter and the receiver , can adopt the noncoherent ML detector under the Rayleigh fading channels .

对使用了相位连续的频移键控编码方式（FSK）的信号传输系统中的几种传输信号现代检测方法进行了探讨，并对其所对应的信号特征的提取方法进行了数学描述；

Discusses the modern test method for the transmission signal in the signal transmission system with phase-consecutive frequency shift keying ( FSK ) encoded mode , and describes the relative signal characteristic extraction method with mathematics and presents the characteristic function for the communication signal characteristic extraction method .

目前随着频谱分析技术在铁路中的应用，人们发现当调制系数较小时的频移键控（FSK）信号（如UM71轨道电路信号）与调幅（AM）信号的频谱图非常相似，很难区分。

With the wide application of spectrum analysis techniques in railway , it is discovered that the spectrums of FSK signal and AM signal are very similar , and very difficult to be distinguished . A theoretical analysis is done to the spectrums of these two signals in this paper .

通过对传统载波数据传输方式的分析，介绍一种新型电力线载波数据传输装置，采用八进制正交振幅调制替代频移键控调制，实现上音频复用传输1200bps数据。

With the analysis of traditional data transmitting method in power line carrier channel , this paper introduces a new transmission device which adopts octal quadrature amplitude modulation instead of frequency shift keying to achieve the requirement of multi-purpose 1 200 bps data transmitting .

频移键控调制的直序列扩频技术在水声遥控引信中的应用研究

Study on Application of DSSS-FSK Technique to Underwater Acoustic Remote Control Fuze