EM-MWD Power Saving Technique Based on DPPM
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摘要: 为了延长EM-MWD电池的使用周期，研究了一种EM-MWD节电技术。利用差分脉冲位置调制（DPPM）编码占空期较长的特点，采用DPPM编码进行调制，在占空期关闭EM-MWD发射机和射频电路，仅在脉冲信号发生期发射无线电磁波载波，达到降低EM-MWD发射机能耗的目的。根据节电效率和编码效率的定义，指出DPPM编码码组位数和编码时隙是确定其节电效率和编码效率的2个关键参数。编码码组位数增加，节电效率增大，而编码效率降低，兼顾编码效率和节电效率的最优码组位数为3或4。缩短编码时隙，可以显著提高编码效率，而节电效率下降要缓慢些。几种常用时隙的分析表明，在保证适当误码率的情况下，较短的时隙，有利于在编码效率与节电效率之间做到平衡。研究结果表明，在DPPM编码占空期关闭发射机和射频电路，可以显著降低能耗，延长电池更换周期。Abstract: A kind of power saving technique has been developed in order to extend the battery replacement cycle of EM-MWD.With longer duty period,DPPM is employed for signal modulation of EM-MWD to save power.The transmitter and radio frequency circuit of EM-MWD are shut off power during the loner duty period and only powered on for radio emission in pulse phase,which can significantly reduce the EM-MWD transmitter power consumption.Coding block bits and time slot are two key parameters to determine energy saving efficiency and coding efficiency of DPPM.Energy saving efficiency increases with coding block bits,but coding efficiency decreases.Matching the coding efficiency and energy saving efficiency,the optimal block bits number is 3 or 4.Shortening coding time slot can significantly improve coding efficiency,while energy saving efficiency slowly decreases.On the premise of ensuring appropriate bit error rate,three kinds of common time slot were analyzed,which showed that the shorter time slots was favorable for the tradeoff between coding efficiency and energy saving efficiency.Analysis and examples showed that powering off transmitter and radio frequency circuit during DPPM code duty period could significantly reduce the energy consumption and prolong battery replacement cycle.
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Keywords:
- EM-MWD /
- energy saving efficiency /
- DPPM /
- coding efficiency /
- battery /
- time slot
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