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数字通信中的16QAM映射
- 数字通信中的16QAM映射,采用格雷码编码,包括星座图的显示,简单明了清晰,由此可以退出64,128QAM的matlab编码-Digital communication 16QAM mapping, the use of Gray coding, including the constellation display, simple clear, it can be out of the 64,128 QAM matlab code
QAM
- QAM是一种矢量调制,将输入比特先映射(一般采用格雷码)到一个复平面(星座)上,形成复数调制符号,然后将符号的I、Q分量(对应复平面的实部和虚部,也就是水平和垂直方向)采用幅度调制,分别对应调制在相互正交(时域正交)的两个载波(cos wt和sin wt)上-QAM is a modulation vector, the first mapping the input bits (Gray code commonly used) to a complex plane (constellation
1
- QPSK利用载波的四种不同相位来表征数字信息。由于每一种载波相位代表两个比特信息,因此,对于输入的二进制数字序列应该先进行分组,将每两个比特编为一组,然后用四种不同的载波相位来表征。我们把组成双比特码元的前一信息比特用a代表,后一信息比特用b代表。双比特码元中两个信息比特ab通常是按格雷码排列的,它与载波相位的关系如表1-1所示,矢量关系如图1-1所示。图1-1(a)表示A方式时QPSK信号矢量图,图1-1(b)表示B方式时QPSK信号的矢量图。 -should first group,
QPSK_AWGN_GRAy_ErrorCalculate
- 信息经格雷码映射,进行QPSK调制并通过AWGN信道发射,在接收端进行QPSK解调,并统计误符号率和误码率。-Information on the Gray code mapping, QPSK modulation and emission through the AWGN channel, QPSK demodulator at the receiving end, and the statistical symbol error rate and bit error rate.
gelei_Untitled
- 降低PAPR编码方法中的格雷码仿真程序,能仿真出结果。仿真参数为:子载波数目N=16,BPSK调制,过采样因子w=16,-Reduce the PAPR coding method of Gray code emulator, simulation results. The simulation parameters: number of subcarriers N = 16, BPSK modulation over-sampling factor w = 16,
num2gray
- 二进制数转格雷码程序,输入一个二进制数,直接输出该二进制数的格雷码及其对应的十进制的数值-Binary Gray code value transfer program, enter a binary number, the direct output of the binary Gray code and its corresponding decimal
256QAM
- 256QAM调制及解调程序,采用格雷码编码格式。-256QAM modulation and demodulation
QPSK_daitong
- QPSK信号,数字带通传输,格雷码编码,根升余弦滤波器,加性高斯白噪声-QPSK signal, a digital bandpass transmission, gray code, root raised cosine filter, additive white gaussian noise