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中文摘要：
针对现有编码在无源感应装定系统中能量传输效率不高的问题,在使用2ASK调制的条件下,通过改变1个码元周期内高电平的等效平均持续时间的方法,设计了一种改进型传号反转码（coded mark inversion,CMI）作为基带码,并分析了该码的能量传输效率、功率谱及AWGN信道非相干解调的误码性能,并成功地运用于无源感应装定系统中,最后给出了解码方法和实测电压波形。该编码相对于CMI码的能量传输效率提高了60%,而且具备CMI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。
英文摘要：
Aiming at the low energy transmission efficiency of the passive induction setting system with the existing codes,an improved CMI code is proposed as baseband code by changing the equivalent average time of high level during a code cycle under 2ASK modulation. The properties are analyzed,such as energy transmission efficiency,power spectrum and the error probability in incoherent demodulation in AWGN channel. The code is successfully applied to passive induction setting system,and the decoding method and measured voltage waveform are given. With the code,the energy transfer efficiency is improved by 60% than that of CMI code. It is not only beneficial to energy transmission,but also has the merit of CMI code that the bit timing information is extracted easily,which is fully utilized in incoherent demodulation to solve the sampling moment error accumulation problem resulted from the instability of internal oscillator.
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