科研之友
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摘要
In this paper, we consider a full-duplex system where the access point installed with multiple transmitting antennas and a single receiving antenna serves several single-antenna remote users. In this case, there are 2 kinds of interferences. One is the near-field self-interference (SI) induced by the simultaneous transmitting and receiving over the same band, and the other is the cochannel interference caused by the multicast broadcasting in the same band. A problem of near-field SI cancellation and the cochannel interference suppression using transmit beamforming is formulated at the access point. This problem of ensuring the near-field line-of-sight SI suppression benchmark and maximizing the minimum received signal-to-interference-plus-noise ratio of remote receivers leads to a nonconvex NP-hard optimization. Furthermore, we introduce a semidefinite relaxation technique coupled with linear program power adjustment and an outer bisection search loop to transform the problem into a convex optimization. This can be solved by the modern interior point methods. Simulations show that the proposed method is feasible even when the local receive antenna in near-field and the remote receivers in far field are in the same direction.
- 出版日期2018-6
- 单位电子科技大学
