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Interference-insensitive synchronization scheme of MSK for transmit-only Wireless Sensor Network

In this paper, we propose a complete data-aided (DA) synchronization algorithm for minimum-shift keying (MSK) transmission, which addresses features of the transmit-only Wireless Sensor Network (WSN). To provide reliable packet detection even under a packet overlapping scenario, our frame synchronization metric is based on a pseudo-random (PN) sequence preamble and keeps a constant low false alarm by dynamic thresholding based on real-time error floor level. The carrier frequency offset algorithm exploits the Discrete Fourier Transform (DFT). Meanwhile, the preamble is also used as the training sequence for phase offset estimation based on a least-square (LS) estimator, to reduce the transmit energy. We simulate the packet detection rate, false alarm rate, and the root mean square (RMS) error of all synchronization parameters for the scenarios with and without packet overlapping. The computer simulation shows the robust performance of the synchronization process and reveals the great flexibility and trade-off control between complexity and performance by adjusting system design parameters.