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- 2017
基于钻柱声波信道的随钻数据V-OFDM传输方法研究
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Abstract:
随钻数据声波传输系统利用声波沿钻柱信道传播，实现井下和地面信息准确高效的实时通信。钻柱信道由钻杆和接箍周期性构成，通过理论分析和建模仿真，得到通阻带交替存在的梳状频谱特性，并采用FIR滤波器逼近，建立信道仿真平台。矢量正交频分复用技术（V-OFDM）可以将多径衰落信道分解为多个矢量子信道，通过加入适量的循环前缀，在消除符号间干扰（ISI）的同时，利用分集增益，可以减小由于信道频谱零点造成的误码，增加系统的鲁棒性。仿真和实测结果表明，该方法在满足低误码率的同时，能降低数据冗余，提高传输效率。
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