Synchronization of multiple independent sub-array antennas for IoT applications

In this paper we present a new technique to synchronize multiple individual unsynchronized subarray antenna systems to form one large aperture array antenna system. The proposed technique synchronizes the time and the frequency of the different sub array antenna systems, using a joint Maximum Likelihood (ML) optimization for a data aided received signal, while the phase coherency between the sub arrays is achieved using a combination of least mean square (LMS) and ML algorithms. The experimental results show that the proposed technique is stable in estimating the global array antenna pattern and converges within the first 50 samples of the received data.