无源数据传输系统的改进型Manchester码

针对能量传输效率和位定时信息提取的要求,提出了一种基带码型即改进型Manchester码。文中给出了该码的编码方法,分析能量传输效率、功率谱及AWGN信道非相干解调的误码性能,提出了解码方法并实测出系统关键节点的电压波形。该编码的能量传输效率比Manchester码高55%,同时具备位定时信息易于提取的优点,可以在非相干解调中充分利用其位定时信息解决接收端内部震荡器不稳定造成的采样时刻误差累积问题。

Improved Manchester Code of Passive Data Transmission System

To fit the energy transmission efficiency and bit timing extracting of passive data transmission system, an improved Manchester code is proposed. After its encoding method is proposed, its properties are analyzed, such as energy transmission efficiency, power spectrum and the error probability in incoherent demodulation in AWGN channel. Its decoding method and measured voltage waveform of key system point is proposed. Energy transfer efficiency of this code is 55 % higher than the Manchester code. It is not only beneficial to energy transmission, but also has the merit that the bit timing information is extracted easily, which is fully utilized in incoherent demodulation to solve the sampling moment error problem resulted from the instability of internal oscillator.