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This paper proposes a preamble detection-based cooperative transmit time pre-synchronization technique specially for Concurrent Cooperative Transmission (CCT). CCT enables a collection of power-constrained radios to transmit as a group and achieve a transmit range that is much greater than the range of a single device. In the absence of a GPS system or a globally synchronized clock, each cooperating node can derive it's transmit time autonomously by detecting the preamble from a received signal. The paper first compares two methods for estimating the Start Of Packet (SOP) received in the presence of a Carrier Frequency Offset (CFO): the peak method, which is optimal in a single diversity channel without CFO, and a mean method, which outperforms peak with large CFO.
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