They do not occur in a decided frequency, but rather through a special modulation, the radio waves identity.
他们通常不发生在确定的频率，而是通过一个特定的调治，来确定无线电波。
AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.
调幅广播可以发送更远的距离，但它的声音质量却不及后来一种被称为频率调制的无线电信号处理方式优越。
The structure of receiver in typical modulation Impulse Radio Ultra Wide Band (IR-UWB) is discussed, and the best IR-UWB receiver on AWGN cannels is given.
在分析AWGN信道特性的基础上，通过研究典型调制方式下的超宽带冲激无线电信号(IR -UWB)的接收机结构，找到了一种IR - UWB最佳接收机。
The first radio broadcasts were made using amplitude modulation.
最初的无线电广播设备采用的是波幅调制。
Modulation Demodulation algorithm is the core of software radio and affects the system performance directly.
调制解调算法在每一个软件无线电中发挥着核心的作用，并且直接影响到系统的性能。
The UWB impulse radio technology is a new kind of communication method these years, in which the swash impulse and time-hopping code modulation techniques are mainly applied.
超宽带冲激无线电技术是近年来新兴的通信技术，其主要核心技术是采用了冲激脉冲技术和跳时码调制。
Therefore, the tuner is essential to the frequency modulation radio.
所以调频收音机中的频率调谐器是至关重要的。
The automatic identification of the modulation types has been applied to many fields such as signal identification, interference identification, radio interception, signal monitoring, etc.
通信信号调制类型的自动识别广泛应用于信号确认、干扰识别、无线电侦听和信号监测等领域。
The basic tasks of radio signals modulation identification are analysis, decision and classification of modulation type for intercepted unknown signals.
无线电信号调制识别的基本任务就是对所截获的不明信号的通带调制种类进行分析、判决和归类。
Automatic identification of the modulation type of a signal has found applications in many areas, especially important for military software radio interception receiver.
自动调制方式识别应用范围广泛，对于军用软件无线电侦察接收机更具有十分重要的意义。
The design scheme of a RFID (Radio Frequency Identification)System is given in this paper. The backscatter modulation technique is used to transmit the data to the reader from a tag.
文中给出射频识别系统的设计方案，系统采用反向散射调制技术完成从电子标签到读写器的数据传输。
Automatic modulation recognition and modulation parameters estimation are key problems in non-cooperative communication systems and Software Defined Radio.
通信信号调制方式的自动识别和调制参数的自动估计是非协作通信和软件无线电中的重要问题。
From this point, M-ary Quadrature Amplitude modulation (MQAM), MultiCarrier modulation (MCM) and adaptive modulation techniques are good candidates in next generation mobile radio system.
从这一点出发，多元正交幅度调制(MQAM)、多载波调制(MCM)及自适应调制技术成为下一代移动无线系统中最有竞争力的几种候选技术。
In order to make a research on the software radio, this thesis focuses on key techniques for radio receiver including: DDC technology, the channelization model, modulation and demodulation algorithm.
为了对软件无线电进行探索性研究，本论文主要研究了软件无线电接收机中的部分关键技术：包括数字下变频算法，多通道并行接收的信道化模型以及调制解调部分的实现。
Having realized the modulation and demodulation algorithm of ASK, FSK, QPSK on the software radio platform, and has provided the modulation and demodulation flow chart and the main part procedure.
在软件无线电平台上研究并实现了ASK、FSK、QPSK等方式的调制解调算法，并给出了调制解调的流程图和主要部分的程序。
The principle of impulse radio (IR), several kinds of pulse generators, pulse modulation and signal emission for UWB radio, as well as characteristics of UWB-IR are mainly presented and concluded.
重点分析了脉冲无线电方式的原理，脉冲的几种产生方法，调制、发射以及脉冲信号的技术特点。
The technical project of adaptive radio fuze jamming is designed and the signal modulation identification technique of radio fuze is analyzed.
根据无线电引信的工作特点，提出了可重构自适应无线电引信干扰技术。
The ultra wideband (UWB) radio models have been introduced with pulse-position-modulation (PPM), on-off-keying (OOK) and pulse-amplitude-modulation (PAM).
分析了超宽带冲激无线电的脉位调制、通断键控调制和脉冲幅度调制的信号模型。
The main target of this thesis is description the de-modulation algorithm of the RDS (Radio Data System) system in FM radio and further research in this topic.
论文主要研究了调频收音机中RDS信号解调算法及其算法的进一步探讨。
Two mathematic models of software radio receiver are introduced and they provide theoretic basis for designing multi-modulation scheme software radio receiver.
首先介绍了两种软件无线接收机的数学模型，为多制式软件无线电接收机的设计提供了理论依据。
In modern wireless communication system, the direct RF-modulation for transmitting signal is a new developing trend of RF radio.
在现代无线通信系统中，对发射信号进行直接射频调制已成为射频无线电的发展趋势。
Traditionally, DSP only concerns in source coding as well as channel coding, but today, it begins to set foot in radio frequency modulation field.
信源编码，信道编码是DSP在通信信号处理中的传统经典应用，而如今DSP已深入射频调制部分。
In this paper, according to the thinking of software radio, a PSK soft-modulation and soft-demodulation system based on audio-card and DSP is studied and implemented.
本文基于软件无线电的思想，研究并实现了以 多媒体计算机声卡和DSP为基本 硬件平台的PSK信号的软件调制解调。
This paper gives a simple algorithm of quasi-optimal frequency distribution for mobile radio systems, in which the third-order inter-modulation does not appear. The computation results are given.
本文提出了移动电台无三阶互调的准最优频率分配的简化算法，并给出了计算结果。
G function arithmetic of a HF high speed FH CHESS radio produced in U. S. is deeply studied in this paper, which involves FH pattern and the modulation and demodulation etc.
本文深入研究了美国推出的短波高速跳频CHESS电台的G函数算法，涉及到跳频图案、信息调制与解调等。
This thesis is concerned with the study of designing multi-modulation scheme software radio receiver.
本文对多制式软件无线电接收机的设计进行了研究。
This thesis is concerned with the study of designing multi-modulation scheme software radio receiver.
本文对多制式软件无线电接收机的设计进行了研究。
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