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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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在环境MaxplusII下仿真FSK调制 高电平是输出频率是低电平输出频率的2倍 -MaxplusII FSK modulation Under simulated environmental
High output frequency is 2 times of low output frequency
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16apsk Modulation (Carrier center frequency,Carrier cycle,
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ＷＣＤＭＡ ＦＤＤ 物理层ｍａｔｌａｂ仿真-The WCDMA Physical Layer Demo consists of an end-to-end (transmitter-to-receiver) simulation of the Frequency Division Duplex (FDD) Downlink physical layer for several Dedicated Channels (DCH) as specified by the 3GPP standard (
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蓝牙协议语音通信ｍａｔｌａｂ仿真程序，包含语音传输， I/O, CVSD speech coding, HEC, FEC, framing, GFSK Modulation, frequency hopping, 和802.11b interferer.-Simulink model of a Bluetooth communication link transmitting HV1, HV2 or HV3 voice packets. Includes wave file I/O, CVSD
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As a multi-carrier modulation scheme, Orthogonal Frequency Division Multiplexing (OFDM)
technique can achieve high data rate in frequency-selective fading channels by splitting a
broadband signal into a number of narrowband signals over a number
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设计一个正弦信号发生器，使用凌阳公司的16位单片机SPCE061A作为中央控制器，结合DDS芯片AD9850，产生0～15MHz频率可调的正弦信号,正弦信号频率设定值可断电保存；使用宽频放大技术，在50Ω负载电阻上使1K～10MHz范围内的正弦信号输出电压幅度VP-P=6V±1V；产生载波频率可设定的FM和AM信号；调制信号为1KHz的正弦波，调制信号的产生采用DDS技术，由CPLD和Flash ROM加上DAC进行直接数字合成；二进制基带序列码由CPLD产生，在100KHz固定载波频率下进行数
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对OFDM（正交频分复用）的调制和解调过程的仿真-On OFDM (Orthogonal Frequency Division Multiplexing) modulation and demodulation process simulation
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matlab源码编写的QPSK调制与解调程序，含载波及采样频率-matlab source code written in QPSK modulation and demodulation process, including the carrier and sampling frequency
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Delta_Sigma调制 锁相频率合成器的设计与实现-Delta_Sigma modulation PLL Frequency Synthesizer Design and Implementation
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Mean square error calculation in Orthogonal frequency division multiplexing system using Quadrature Amplitude modulation.-Mean square error calculation in Orthogonal frequency division multiplexing system using Quadrature Amplitude modulation.
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Multiple input multiple output orthogonal frequency division system using space time block codes with 8PSK modulation.
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This scr ipt simulates Amplitude Modulation. I have simulated Double Side Band with Large as well as supressed Carriers.
The Output shows the two modulations in both frequency and time domains.
Hope this will help out people.
Good Luck.
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设计并制作一个发射频率在30MHz~40MHz之间自行选择，发射峰值功率不大于20mW(50 假负载电阻上测定)的主站来传送一路语音信号，射频信号带宽及调制方式自定-Design and production of a transmitter frequency 30MHz ~ 40MHz to choose between the emission peak power less than 20mW (50 false load resistance on the determination
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