Search - symbol factor

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[Other] 16QAM DL : 0: 仿真练习（第六次刘课件中有关于噪声的添加方法）？编写一个含QAM传输的发送和接收模块？分别采用复基带仿真和实带通仿真两种形式？复基带仿真时过采样率为4倍,实带通仿真时过采样率为20倍, 实带通仿真时, 载波频率为符号率的4倍？发端采用滚降系数0.5的根号升余弦滤波器？画出Eb/N0=15dB时的接收波形(收滤波前),取100个采样？画出发端输出的眼图和收端过匹配滤波后的眼图(画眼图时不加噪声) ？统计误符号率和误比特率与Eb/N0的关系,画出曲线, 与理论计算的曲线相对比-Simulation exercises about noise (sixth Liu courseware Add method) ? Preparation of the one containing the transmission and reception of QAM transmission module ? Complex baseband simulation and real bandpass simulation were used in two forms ? When the simulation of the complex baseband oversampling rate 4 times, real bandpass simulation over-sampling rate of 20 times the real bandpass simulation, the carrier frequency is 4 times the symbol rate ? Originator using the square root raised cosine filter roll-off factor of 0.5 ? Draw Eb/N0 = 15dB received waveform (received before filtering), take the 100 samples ? Draw originator output eye diagram and eye diagram after the receiving end matched filtering plus noise (painted eye diagram) ? Statistics symbol error rate and bit error rate and Eb/N0 relationship, draw curves, and compared with the theoretical calculation of the curve
Date : 2025-12-25 Size : 7kb User : Chang
[Other] 16qam DL : 0: 16QAM通过带限信道，设码元速率为1000波特，传输的滚降系数是0.75的滚降升余弦滤波器-16QAM by band-limited channel, set the symbol rate is 1000 baud, roll-off factor of transmission is 0.75 rolloff raised cosine filter
Date : 2025-12-25 Size : 4kb User : 王幕林
[Other] cognitivel DL : 0: frequency expander. Matlab code for expander.When x is a vector, this function adds L-1 after each element of x. When x is a matrix, each column of it treated as vector and expanded L fold. SQUARE-ROOT RAISED-COSINE PULSE: h=sr_cos_p(N,L,alpha) This function generates a square-root raised-cosine pulse of length N+1. There are L samples per symbol period. alpha is the roll-off factor.
Date : 2025-12-25 Size : 1kb User : kris
[Other] PST部分传输序列法 DL : 0: PTS的基本思想是：将输入的OFDM符号X，分割成V个互不重叠的独立的子序列Xv，每个子块向量大小相等且子块中没有继承原符号相应位置的取值为0。经过N点快速傅里叶逆变换后获得时域信号xv，再与相位旋转因子系数bv相乘，最后将每个子块的结果求和。然后将使PAPR最小的旋转因子的最佳组合作为边带信息传送给接收机以恢复信号。在PTS方法中，可以通过改变子序列的分割方式降低系统计算复杂度和改善系统性能。有三种常用的分割方法：相邻分割、伪随机分割和交织分割。(The basic idea of the partial transmission sequence method (PTS) is to split the input OFDM symbol X into V independent non-overlapping subsequences Xv, each of equal size and no inheritance of the corresponding position of the original symbol in the sub-block to take the value of 0. After N-point fast Fourier inversion to obtain the time domain signal xv, and then multiply with the phase rotation factor bv, and finally sum up the results of each sub-block . The best combination of rotation factors that minimizes the PAPR is then transmitted to the receiver as sideband information to recover the signal. In the PTS method, the system computational complexity can be reduced and the system performance improved by changing the segmentation of the subsequence. There are three commonly used segmentation methods: adjacent segmentation, pseudo-random segmentation, and interleaved segmentation.)
Date : 2025-12-25 Size : 3kb User : zsdslehqm