The phenomenal growth of mobile data has brought new challenges on the limited spectrum resource. Deploying LTE on unlicensed bands has been introduced, namely LTE-U, which could provide a higher transmission data rate, spectrum efficiency as well as seamless mobile user experience by taking advantage of the Carrier Aggregation technology. In this paper, we first introduce the coexistence model between LTE-U and WiFi in the multi-operator scenario. To avoid long colliding time among operators due to the same backing off window size, a full duplex-based listen and talk access scheme is introduced. The proposed listen-and-talk based imperfect sensing power adaption (LAT-ISPA) scheme could avoid the interference among multi-LTE-U operators, maximize the effective throughput of LTE-U while ensuring the transmission performance of WiFi by optimizing the backing off window as well as the transmission power in different scenarios. Due to the residual self-interference by the LAT scheme, the imperfect sensing is taken into consideration. Simulation results show that the proposed algorithm could achieve a considerable performance improvement with respect to the schemes in literatures.
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