声波沿钻柱通信BPSK调制系统时钟恢复

BPSK(Binary Phase Shift Keying)调制相位的载波信号为双相标记编码信号。由于声波换能器的非线性特性,以及钻柱信道带来相位偏移,可能会导致在每个位周期之间和不同码元的过渡期之间产生不依赖于数据的过度过程;以及由于换能器起振不能立刻达到很好的状态,致使相位未能达到理想的偏移,从而引发解码过程的错误。为了保证正确的解码操作,锁定过渡期,逐步恢复时钟尤为重要。针对BPSK载波信号的特点,设计时钟恢复系统,克服传统锁相技术的确定,可以很好地根据输入信号保证传输的独立性,使相位不受换能器和信道中间过渡的相位偏移的影响,锁定正确相位从而恢复系统时钟,保证后续解码工作正确稳定地进行。

Code Clock of Acoustic Communications Using BPSK

BPSK are similar in that they have one regular transition every bit period and an intermediate-transition which may or may not be present dependent on the data;the magnetostriction is known to have non-linear characteristics and transmitter may not achieve a good start-up state,immediately.Those factors which may lead to phase error,for correct operation,the recovered clock must be phased locked to the regular transitions.A problem with phase lock loop designs can be that incorrect phase lock can be established on an input which contains a large proportion of data dependent transition.In this paper,the closed-loop system ensures the input signal transmit independently.The recovery clock system recovers the clock from the transmission signal to ensure data recovery correctly.