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系统组织部分: 信号发生芯片AD9850+单片机STC89C52+显示LCD1206+按键
芯片功能简单介绍(详细资料可参见21ic网站参阅.)
AD9850采用DDS(直接数字频率合成)技术, 即输入频率值, 通过内部调制, 经DAC产生信号 理论上可产生0~40MHz的正弦波信号
在此设计运用上, 用户通过按键电路经单片机设置的频率值送至AD9850,产生正弦波信号.
-Program: the system part of the organiza
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6. 在三条径的瑞利信道中，对于OFDM：
(1) 请设计一种具体的导引辅助的信道估计方法，用Simulink进行仿真，测量BPSK调制时的误码率性能。画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线。
(2) 设频率已同步，请设计OFDM一种具体的采用循环前缀进行时间同步方法，用Simulink进行仿真，画出比特信噪比与捕获概率的关系曲线。
(3) 设时间已同步，请设计OFDM一种具体的采用循环前缀进行频率同步方法，用Simulink进行仿真，画出比特信
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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。*正常情况下，由于反射和高灵敏度接收，LED4（P1.3)一直闪烁，可以用黑色纸片完全遮挡接收头使*之不能接收到发射管的信号，这是LED4熄灭。说明功能性正常-Infrared testing program, microcontroller through the launch tube with a 38K code modulation frequency, from integration to re
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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。*正常情况下，由于反射和高灵敏度接收，LED4（P1.3)一直闪烁，可以用黑色纸片完全遮挡接收头使之不能接收到发射管的信号，这是LED4熄灭。说明功能性正常-Infrared testing program, microcontroller through the launch tube with a 38K code modulation frequency, from integration to rec
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本文以高性能数字信号处理芯片TMS320F2812为核心,设计生成了基于不对称规则采样算法的SPWM波形,键盘输入参数设定调制波频率。本文首先分析了不对称规则算法的原理,接着设计了基于TMS320F2812芯片的软件设计流程,最后在数字示波器上显示了实验波形,验证了设计的有效性和可行性-In this paper, high-performance TMS320F2812 digital signal processing chip as the core, designed to genera
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用at89c2051单片机产生15HZ~~~50KHZ的方波，并且实现频率和脉宽的独立调制。-Microcontroller with at89c2051 produce 15HZ ~ ~ ~ 50KHZ square wave, and independent of frequency and pulse width modulation.
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modulation frequency shifting
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由MATLAB程序产生2Gbi/s的基带OFDM信号先将2^15-1个伪随机序列映射到256个进行4QAM编码调制的子载波上，编码后的OFDM符号再经过IFFT变换将其转换为时域波形，接着添加6.4ns的循环前缀（CP），产生的数据波形再装载到Tektronix任意波形发生器（AWG）中，产生2Gbit/s的基带OFDM信号。基带OFDM信号频谱示意图如图3所示。其中包括256个OFDM子载波256个子载波中200个子信道用来传送数据信号，27个高频和28个低频子信道为了过采样的需要置0，OFD
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正弦波发生器，产生频率、相位可调的正弦波，并且实现了AM调制，已通过仿真-Sine wave generator to produce the frequency, phase adjustable sine wave, and the realization of the AM modulation, has been through the simulation
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Orthogonal frequency-division multiplexing (OFDM), essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large numb
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Orthogonal frequency-division multiplexing (OFDM), essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large numb
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Orthogonal frequency-division multiplexing (OFDM), essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large numb
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Orthogonal frequency-division multiplexing (OFDM), essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large numb
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Orthogonal frequency-division multiplexing (OFDM), essentially identical to coded OFDM (COFDM) and discrete multi-tone modulation (DMT), is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large numb
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scr ipt for computing the SNR loss due to frequency offset in OFDM modulation
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The major evolution of UMTS (Universal Mobile Telecommunications System) in recent years
is the High Speed Downlink Packet Access (HSDPA)which provides data rates up to 10Mbps. The
implementation of HSDPA includes multicodes transmission in joint
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基于BPSK调制方式的正交频分复用的源代码-BPSK modulation based on orthogonal frequency division multiplexing source
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4路子载波调制的正交频分复用源代码，以及误比特率的计算，画图-4 way carrier modulation orthogonal frequency division multiplexing source code, and bit error rate calculation, drawing
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高频电子技术的仿真实验包括：LC选频。AM,FM,DSB,SSB的调制。利用EWB仿真-High-frequency simulation of electronic technology, including: LC frequency selection. AM, FM, DSB, SSB modulation. EWB simulation using
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用DSM调制1-bit输出，经简单模拟滤波电路，产生VGA控制电压。对于内部频率高、但VGA变化速度较慢的场合，可以达到很高的控制精度，从而省却了内部高精度DAC的模块-DSM modulation with 1-bit output, through a simple analog filter circuit, producing VGA control voltage. in the circumstance of high internal frequency, but need a s
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