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一种用于电力线载波机的π/4-QPSK调制解调器

π/4-QPSK modem used in power line carrier
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摘要 π/4-QPSK是四进制相移键控(QPSK)的改进方式,具有较高的频谱效率和较好的抗噪声性能。π/4-QPSK调制解调器可用于电力线载波机传输远动装置信号。输入数据经并/串变换、差分相位编码、低通滤波器后正交调制而合成π/4-QPSK信号;π/4-QPSK的解调采用基带差分解调使用数字信号处理器实现。使用Matlab6.5仿真了数字方案解调在不同信噪比下的误比特率,理论分析与仿真实验结果表明:误比特率随着频率偏差的增加呈指数增加。 π/4-QPSK（Quaternary Phase Shift Keying）,an improved QPSK modulation,possess higher frequency efficiency and antinoise ability. π/4-QPSK may apply to PLC（Power Line Carrier） for telecontrol information transmission. Having been processed by parallel/series converter,differential phase coder and low-pass filter,the input data are orthogonally modulated to compose π/4- QPSK signal. The baseband differential demodulation is done by DSP. The demodulation BERs under different SNR conditions are simulated with Matlab 6.5. Theoretical analysis and simulative results show that the BER is exponential times of frequency differential.
作者 曾筝 李玉柏 李桓
机构地区 电子科技大学通信学院
出处 《电力自动化设备》 EI CSCD 北大核心 2005年第11期72-75,共4页 Electric Power Automation Equipment
关键词 Π/4-QPSK 基带差分解调 数字信号处理器 MATLAB π/4- QPSK baseband differential demodulation DSP Matlab
分类号 TM73 [电气工程—电力系统及自动化] TN76 [电子电信—电路与系统]
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共引文献45

电力自动化设备
2005年 第11期

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