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论文类型：会议论文

发表时间：2018-01-01

收录刊物：CPCI-S

卷号：2018-April

页面范围：1-6

摘要：Advances of mobile technology and global booming of "smartphone economy" promote a tremendous growth of smartphone-oriented applications with an exponential increase of mobile traffic in the past decade, resulting in expectable saturation of LTE spectrum in the next few years. Mobile-to-mobile (M2M) communications, capable of extending LTE capacity with enhanced spectrum efficiency, have been considered as a promise solution to this problem. One popular approach to deploy the M2M technology is to establish an M2M subsystem as an underlay to the current LTE network so that the M2M link can share the same radio resource with LTE regular links. Although this scheme can further explore the spectrum efficiency, it is challenging to design such an M2M subsystem without harmful interference to LTE regular users. We propose in this paper a novel proactive interference cancellation mechanism to form an interference-free underlay. The major innovation of the proposed framework is to use the codebook-based precoding technique to design appropriate precoders for eNB and M2M transmitter in order to achieve maximal reception interference suppression proactively at the transmitter side. Since the codebook-based precoding technique has already been employed in LTE, the proposed scheme is compatible to current LTE systems and applicable for real-world implementation. This is in strong contrast to several existing interference cancellation M2M schemes that highly rely on the unrealistic assumption on theoretical-oriented channel state information (CSI) feedback. Preliminary simulation results demonstrate the efficiency of the proposed scheme.