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Adjacent Channel Interference Suppression to Enhance Spectrum Sharing for Co-located Devices

The increasing demand for spectrum resources has prompted people to improve spectrum utilization by spectrum sharing technology. However, mutual interference between co-located wireless devices will cause spectrum conflicts and decrease the spectrum utilization. To tackle this issue, this paper presents a method to suppress the adjacent channel interference (ACI) between co-located wireless devices, which is caused by the transmitter nonlinear distortion. An auxiliary chain is deployed to regenerate the ACI, and a memory polynomial model is used to estimate the nonlinear characteristics of the system. Eventually, the ACI is reconstructed and subtracted from the received signal. Theoretical analysis of ACI elimination is presented, and the algorithm is subsequently verified by both simulation and experiment. The simulation and experimental results show that the proposed method can effectively relieve the ACI and enhance the spectrum sharing capability between co-located devices.