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In this work, the repeated game model with unequal discount factors is utilized to understand how the players' behavior affect the system performance in a decode-and-forward cooperative communication system. Unlike previous work, in which all free-ridings are illegal, we differentiate the free-riding into the legal free-riding (LFR) and the illegal one (IFR). Taking LFR and IFR into account, the conditions...
To solve interference in a heterogeneous network, LTE-A uses almost blank subframe (ABS) to improve channel quality of picocells at the expense of macrocell’s transmission. Many studies find the ABS ratio based on user number or traffic load. However, the issue of real-time (RT) packet delay is not well studied. We thus develop a delay-aware ABS adjustment (DA3) method to improve performance and lower...
In this work, we acknowledge the existence of the accumulation of the loopback self-interference when AF protocol is made used of in FDTW relaying and the channel estimation of the loopback channel is not done perfectly as will seen in the section to follow. The accumulation of the loopback self-interference comes from the functionality of FD antenna, which will bring back the transmitted signal to...
Long term evolution-advanced (LTE-A) supports high-speed communications for cellular systems. It allows different types of base stations to form a heterogeneous network to provide service. However, signal interference between a macrocell and its picocells is inevitable. Thus, LTE-A adopts enhanced intercell interference coordination (eICIC) to conquer the interference problem. In the time-domain eICIC...
Multi-User Multiple Input Multiple Output (MU-MIMO) enables a multi-antenna access point (AP) to serve multiple users simultaneously, and has been adopted as the IEEE 802.11ac standard. While several PHY-MAC designs have recently been proposed to improve the throughput performance of a MU-MIMO WLAN, they, however, usually assume that all the concurrent streams are of roughly equal length. In reality,...
In D2D communication, power allocation is important due to interference among D2D users. In this paper, we model the power allocation problem in D2D environment as a stochastic game and find the Nash equilibrium. The simulation shows the workability and correctness of the proposed stochastic power allocation game.
This paper introduces algorithms to find relay ordering in a multi-hop cooperative diversity network. We first describe an optimal relay ordering algorithm for this multi-branch multi-hop cooperative diversity network. The optimum algorithm has a very high complexity that makes it hard to implement when being used in an environment with a large number of relays. Thus, we propose algorithms to reduce...
Contention-based geographic relay selection for cooperative networks has been proposed as a state-free distributed scheme to efficiently select the best relay within a geographic area. The a priori choices for the relaying area cause different effects on the overall network performance. In this paper, we focus on the fundamental problem of predefining the relaying area and investigate its impact on...
The reduction of motion artifact in the ECG applications has become a more and more important issue. In this paper, we have successfully developed a novel motion artifact reduction method by the combination of G-sensor and skin-stretched sensor for the hardware and a master-slave multiple noise reduction algorithm for the software. A portable ECG system with our proposed noise reduction method can...
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