A two-step MF signal acquisition method for wireless underground sensor networks
2016
Signal acquisition plays a critical role on the bit error rate (BER) of a
direct sequence spread spectrum (DS/SS) communication system working with
low frequency. In this paper, we propose a new signal acquisition method.
The acquisition process includes coarse matched filter (MF) location in the
first stage and an accurate MF acquisition as a verification mode for the
second stage. The performance metrics, including mean acquisition time (MAT)
and power consumption, are accuracy. The results indicate that when the
signal-to-noise ratio (SNR) keeping consistent, the MAT of the proposed
method is less than the original one. When the SNR is around -5dB, the
system mismatch rate is about 5:6 x 10-4, which takes only one percent of
those achieved in the original acquisition algorithms. The two-step MF
acquisition method is stable except its power consumption being a little
higher than the original method.
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