Adaptive array for reducing high-power CCI on asynchronous TDD systems

This paper proposes a novel adaptive array configuration that reduces high- power co-channel interference (CCI) by utilizing the difference in arrival times between CCI and the desired signal in asynchronous TDD systems. The p roposed adaptive array extracts only the CCI and employs pre-null steering for only the CCI by utilizing the fact that only the CCI arrives during the guard time in asynchronous TDD systems. Since the proposed adaptive array enables us to apply the Minimum Mean Square Error (MMSE) algorithm through synchronization with the desired signal using the output signal obtained by pre-null steering, high quality transmission can be achieved even in the p resence of high-power CCI. Moreover, based on measurements using a fading s imulator and field data, an adaptive array testbed exemplifying the propose d configuration is presented to show the reduction in the high-power CCI.