The local oscillator generates the needed frequency demodulation signals, which are in-phase and quadrature signals. QAM is a modulation technology that combines two amplitude modulated signals into a single channel, thus doubling a system’s bandwidth. QAM is also known as quadrature carrier ...
studiedtheQAMmodulationanddemodulationprinciple,itscharacteristicsare analyzed,anddiscussestheQAMmodulationtechnologyintheapplicationofthe communicationsystem.Finally,simulatedinMATLABbycoding,theresulting constellation,eyediagramandBERcurveswereanalyzed, after get the simulation ...
When it is judged that the convergence is completed, the correction of the automatic equalizer 12 is switched to a method performed by the error signal of a coordinate judging apparatus 15, and the transmission of the signal of 3.4kHz is interrupted at a transmission side. In such a way, ...
Use4-QAM baseband modulationto send 20 bits (bits10010 01010on I and bits11101 01001on Q) at an overall transmission rate of 2 bits per millisecond using three pulse shapes given below. Use a carrier whose frequency is 10kHz. Plot the following signal in time and frequency domain for ea...
QAM Modulation and Demodulation 上传者:weixin_42662605时间:2022-09-19 OFDM MATLAB 通信系统仿真程序 OFDM MATLAB 通信系统仿真程序 内含发射和接收、定时、频偏检测,信道估计 上传者:sw6618620时间:2010-04-14 fftDebug_FFT频偏估计_fft_频偏_载波频偏_频偏估计_ ...
[4] Yang Runfeng,SHERRATT R S.Multiband OFDM modulation and demodulation for ultra wideband communications[C].in:Novel Applications of The UWB Technologies,Croatia,InTech,2011. [5] YANG R,SHERRATT R S.Dual carrier modulation demapping methods and performances for Wireless USB[C]. the 9th Annual...
and dependability.Thedevelopment ofmodulationanddemodulation technologyistoreflectthis thought.From theearliest integrity ofthe analog amplitude moddationand frequency modulation technologies,to the widelyuse of digital modulation technologiesnowadays,alltechnologies makethe inforillationtraasmissionmoreeffectiveandllab...
Keyword: QAM modulation and demodulation;Simulink;Simulation 1 绪论 (1) 1.1 QMA简介及应用 (1) 1.2 Simulink软件与通信仿真 (1) 1.3论文主要内容 (2) 2 现代数字调制技术QAM (3) 2.1 QAM调制原理 (3) 2.2 QAM解调原理 (4) 2.3 MQAM信号星座图 (5) 2.4 QAM的误码率性能 (6) 3 QAM调制解调的实现...
正交幅度调制解调(quadrature amplitude modulation and demodulation)就是一种高效的数字调制解调方式,他在中、大容量数字微波系统、有线电视网络高数据传输、卫星通信等领域被广泛应用。单独使用振幅何相位携带信息时,不能最充分利用信号平面,这可由矢量图中信号矢量端点的分布直观观察到。多进制振幅调制时,矢量端点在一...
QAM Modulation and Demodulation Analysis Base on MATLAB 【Abstract】Today, a large part of the spectrum resources has already been used, as the number of users and the demand for business constantly increasing, QAM relying on its high spectrum utilization ratio and low error rate, strong anti-in...