| Improved CMI code in passive induction setting system 〖JP〗 |
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| 作者姓名： | LIU Xiao-min XIONG Dong ZHU Zhou-xian YANG Xue-min and WANG Feng |
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| 作者单位： | College of Communication Engineering,Chongqing University, Chongqing 400044,P.R.China;College of Communication Engineering,Chongqing University, Chongqing 400044,P.R.China;College of Communication Engineering,Chongqing University, Chongqing 400044,P.R.China;Chongqing College of Electronic Engineering, Chongqing 401331,P.R.China;College of Communication Engineering,Chongqing University, Chongqing 400044,P.R.China;College of Communication Engineering,Chongqing University, Chongqing 400044,P.R.China |
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| 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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| 关 键 词： | passive induction setting improved CMI code energy transmission power spectrum |
| 收稿时间： | 2010/7/12 0:00:00 |
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