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We consider a two-way cognitive radio relay network where two secondary users (SUs) can simultaneously transfer energy and information to a relay. Then, a joint optimization algorithm for power allocation and energy cooperation is proposed. The algorithm proves that the formulated throughput maximization problem is a convex optimization problem. Next, we decompose the formulated problem into a power...
In 5G heterogeneous evolution, the unlicensed band has captured much attention. Specified by 3GPP Release 13, LTE WLAN aggregation (LWA) is deemed as an effective approach for spectrum integration of 5G heterogeneous networks (HetNet). However, most of previous works about LWA lie in the architecture design, and rarely investigate LWA algorithm analytically. In this paper, we formulate the network...
This paper presents the first systematic study on co-scheduling independent jobs on integrated CPU-GPU systems with power caps considered. It reveals the performance degradations caused by the co-run contentions at the levels of both memory and power. It then examines the problem of using job co-scheduling to alleviate the degradations in this less understood scenario. It offers several algorithms...
In heterogeneous cellular networks, a macro base station(MBS) power control algorithm based on macro users' fairness is proposed in this paper. In this algorithm, macro users choose channels based on the interference from femtocells. Then, the power solution of MBS in every channel is derived through the non-cooperative game. The constructed game utility function considers not only the system capacity,...
This letter considers the performance of secondary networks using an Aloha-type random access protocol with multi-packet reception (MPR) for interference-limited communication. To simplify the analysis, it is usually assumed a specific backoff scheme, geometric retransmission for instance, for cognitive access in previous studies. Consequently, how to achieve the optimal performance of cognitive networks...
Cognitive radio can effectively improve spectrum utilization by allowing the secondary user to access spectrum licensed to the primary user. According to cognitive radio principle, the secondary user can access the channel only when sensed idle. In this paper, we study the spectrum-sharing problem of a basic cognitive network consisting of a primary user (PU) link and a secondary user (SU) link, and...
How to improve the spectrum utility of the unlicensed uses (secondary users) without interfering the licensed spectrum holders' usage becomes a key issue in the cognitive radio system. In this paper, we consider an underlay cognitive radio system in which the secondary users can make use of the allowance of the primary users' SINR constraints and operate on the same spectrum band as the primary signals...
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