Transmitter-side timing adjustment to mitigate interference between multiple nodes for OFDMA mesh network

We propose new timing adjustment techniques at the transmitting nodes of the OFDMA mesh networks in order to minimize mutual-pair interference (MPI) as much as possible. The proposed methods suggest the adjustment parameters for the received signals from multiple transmitting nodes to be aligned as much as possible for multiple receiving nodes simultaneously. First, minimum distance condition is suggested and the corresponding linear programming method is introduced. Next, the least squares (LS) technique is applied for timing adjustment, and the decentralized adjustment scheme is developed based on LS solution. The performance results confirm that the proposed timing adjustment scheme dramatically improve the overall performance of OFDMA mesh networks because it can effectively reduce the amount of MPI caused by asynchronous feature of the OFDMA mesh network.