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In recent years, wireless mesh network functioning as backbone for other sensor network applications has been attracting much of attention. For realization of a high data rate and reliable mesh network, a synchronized mesh network technology employing OFDM as a block processing scheme has been proposed. However, the conventional scheme is not convenient as it requires network synchronization of all the nodes in the network done before starting data communication. This paper proposes a novel scalable network synchronization scheme where data transmission and network synchronization setup can be done simultaneously. The proposed algorithm is implemented in the developed 950MHz TDD MIMO two-way network prototype hardware, and its behavior is verified.