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这是一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模块，并统括系统性能的仿真验证了系统设计的可靠性。
-This is a relatively complete simulation of OFDM communication system design, including coding, modulation, IFFT, the upper and lower frequency, Gaussi
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幅度调制,双边带信号产生、双边带调幅的时域表示式及频谱-Amplitude modulation (AM),double side-band signal generation,the time domain expression and frequency spectrum of double side-band Amplitude modulation
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模拟调制：幅度调制中的双边带幅度调制的时域表示式和频谱，及代码实现
-Analog modulation: amplitude modulation with amplitude modulation in bilateral expression in time domain and frequency spectrum, and code implementation
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双边带调制及频谱仪的设置，如何在高频、低频中观测频谱特性-Modulation and spectrum analyzer with a bilateral setting, how high-frequency, low-frequency spectrum observed
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Modulation Index and varying carrier frequency for PWM inverter with outputs
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对讲机的用途很广泛，发送原理是把音频信号转换成电信号,再通过调制之后利用特定的频率范围发送出去。
接收是利用接收器对特定的频率范围之内收到的信号通过解调之后通过扬音器发出收到的信息声音
-Radio is so widely used, principle is to send the audio signals into electrical signals, then through the modulation after the use of a particular freq
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Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. High Peak-to-Average Power Ratio (PAPR), which leads to power inefficiency
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In this paper, we describe a novel approach for reducing the power consumption and complexity of a multiband orthogonal frequency-division multiplexing (MB-OFDM) ultrawideband (UWB) system by applying ideas from pulsed UWB ystems. The approach is qui
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红外测试程序，用单片机通过发射管发射38K的调制频率码，由一体化接收并解码由发光管显示。-Infrared testing procedures, with the microcontroller through the launch tube launch 38K code modulation frequency, from integration to receive and decode the LED display.
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FSK modulation matlab model
frequency deviation
FSK modulacia so spojitou fazou je zalozena na frekvenciach,
t.j. ak k=f/tb a k je celociselny nasobok oboch frekvencii.
Ak k nie je celociselny nasobok, potom je to FSK modulacia s nespoji
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EVA下面的通用定时器T1工作于连续增/减计数模式，产生三角载波，载波频率为3000Hz，载波比N=60，因此调制波形正弦波的频率为50Hz。-EVA below T1 work general timer continuous increase/decrease counting mode, triangle, carrier frequency modulated carrier for 3000Hz, N = 60, therefore the sine wave modulation f
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该高频正弦信号发生器基于直接数字频率合成（DDS）和数字锁相环技术（DPLL），以微控制器（MCU）和现场可编程逻辑门阵列（FPGA）为核心，辅以必要的外围电路设计而成。系统主要由正弦信号发生、红外遥控、高速模数（A/D）－数模（D/A）转换、信号调制和后级处理等模块组成。-The high-frequency sinusoidal signal generator based on Direct Digital Synthesis (DDS) and digital PLL (DPLL), a
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本书是关于无线衰落信道方面的一本好书，书中内含MATLAB代码！
-All relevant components of a mobile radio system, from digital modulation techniques over channel coding through to network aspects, are determined by the propagation characteristics of the channel. Therefore, a pr
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the comb pilot aided channel estimation in ofdm modulation is considered. the power of pilot subchannels is under the control.
The data experience frequency selective channel then the AWGN noise is added to make the situation worse. The bit error
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binary frequency shife keying amplitude modulation
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直接序列扩频系统（DS，Direct Sequence）又称为直接序列调制系统或伪噪声系统（PN 系统），简称为直扩系统，是目前应用较为广泛的一种扩展频谱系统。要传送的信息经伪随机序列编码后对载波进行调制。在发信端越冬用扩频序列去扩展信号的频谱，在收信端，用相同的扩频友序列进行解扩，将展宽的频谱扩展信号还原成原始信号。因为伪随机序列的速率远大于要传送信息的速率，所以受调信号的频谱宽度将远大于要传送信息的频谱宽度，帮称之为扩频-Direct sequence spread spectrum (DS
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通信原理课程设计项目之移频键控FSK调制与解调系统设计实验-Principles of course design project communication frequency shift keying FSK modulation and demodulation system design experiments
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Adaptive equalization教程-Adaptive equalizers compensate for signal distortion
attributed to intersymbol interference (ISI), which is
caused by multipath within time-dispersive channels.
Typically employed in high-speed communication
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产生频率三角形的信号，进行时域调制，并进行解调，最终恢复原信号-Frequency triangular signal generated, time-domain modulation and demodulation, and ultimately restore the original signal
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在信号处理中，信号发射时，信号通过载波，调制，以电磁波的形式发射出来
在接收端，射频信号通过天线接收，超外差式等方式进行处理，变频到中频
然后通过数字技术对中频信号进行处理，此时的中频信号采样率很高，多达几十兆赫
而要解调出来的信号很小，此时就要经过滤波来得到我们需要的信号
如果直接设计滤波器，阶数会非常庞大，软件，硬件设备都承受不了
因此，一般常用的技术是进行下变频处理，其主要技术就是通过抽取滤波进行下变频
常用的滤波器就是CIC抽取, 希望可以帮助一些坛友解决基本的问
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