从这个意义上讲,数字调制和模拟调制并无本质区别。数字调制信号只须表示离散的调制状态,这些离散状态在矢量图上称为符号点 (symbol point),符号点的组合称为星座图(constellation)。 OFDM原理 - 数字调制信号完成对时间离散状态的描述 星座图和符号 星座图展示了 QAM 格式的可用符号。以 16QAM星座图为例,每个符号表示...
signal synthesis, coherent demodulation, sample sentences and string conversion, and a series of system design, the QPSK constellation diagram and the modulation and demodulation of the simulation, and the performance of the system are analyzed, and then proved the superiority of QPSK modulation techno...
12、emodulation, sample sentences and string conversion, and a series of system design, the QPSK constellation diagram and the modulation and demodulation of the simulation, and the performance of the system are analyzed, and then proved the superiority of QPSK modulation technology.Keyword: QPSK Mo...
98 grid on; 99 title('constellation of matched filter output'); 100 figure(8) 101 plot(Isam,Qsam,'X'); 102 axis([-1.2 1.2 -1.2 1.2]); 103 grid on; 104 title('constellation of sampler'); 105 figure(9) 106 subplot(211) 107 stem(final); 108 axis([0 data -2 2]); 109 grid ...
Signal constellation distortion and BER degradation due to hardware impairments in six-port receivers with analog I/Q generation Compact and powerful, the Vyper is fully compliant to the EN302307 standard, meaning it integrates constant coding, variable coding, and adaptive coding and modulation modes...
func_constellation(Srx,Stx,0.5) figure; semilogy(SNR,mean(err,2),'b-o'); grid on xlabel('SNR'); ylabel('误码率'); legend('QPSK误码率'); figure plot(yfit,'-r>',... 'LineWidth',1,... 'MarkerSize',6,... 'MarkerEdgeColor','k',... ...
func_constellation(Srx,Stx,0.5) figure; semilogy(SNR,mean(err,2),'b-o'); grid on xlabel('SNR'); ylabel('误码率'); legend('QPSK误码率'); figure plot(yfit,'-r>',... 'LineWidth',1,... 'MarkerSize',6,... 'MarkerEdgeColor','k',... ...
comm.QPSKConstellation(modulatedSig); 在这个示例中,我们首先生成一个随机比特流。然后,我们使用简单的映射将这个比特流转换为 QPSK 符号。然后,我们创建一个 QPSK 调制器对象,并使用它来调制符号。最后,我们画出调制信号的 constellation。 这只是一个非常基本的示例,并没有包含解调、误码率计算等更复杂的内容。如...
基于Anti-Gray映射的4D-QPSK星座设计方法 Based on 4D-QPSK Constellation Design Anti-Gray mapping本发明公开了一种基于AntiGray映射的4DQPSK星座设计方法,包括以下步骤:步骤S1,基于AntiGray映射的2DQPSK星座,按照最小欧氏距离的汉明距离大于等于2的原则,产生AntiGray映射的3DQPSK星座;步骤S2,修正3D的比特标识为4D的...
signal synthesis, coherent demodulation, sample sentences and string conversion, and a series of system design, the QPSK constellation diagram and the modulation and demodulation of the simulation, and theSER&BERof the system are analyzed, and then proved the superiority of QPSK modulation technology...