Pham Thanh Hiep

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In multi-hop relay systems, the end-to-end channel capacity is restricted by bottleneck node. In order to prevent some relay nodes from being the bottleneck of system and to guarantee the end-to-end channel capacity, the method of optimizing transmit power, distance and allocation time is proposed in this article. We show that the optimizing distance has(More)
A water-filling (WF) method is one of the techniques to improve a performance of multiple-input multiple-output (MIMO) systems. However, the application of the WF method to multiple-hop MIMO relay systems (MMRSs) has not been discussed, especially in amplify-and-forward (AF) schemes. In this paper, the WF method for MMRSs with AF scheme is proposed and(More)
Performance analysis of carrier sense multiple access with collision avoidance (CSMA/CA) scheme based on IEEE 802.15.6 standard has been discussed in many literatures. In previous works on IEEE 802.15.6 and another standards, the performance was analyzed by using access probability in one slot duration and the Markov chain model was proposed to calculate(More)
The bottleneck node is a problem of multiple-hop relay systems. In order to increase the end-to-end channel capacity, all relay node should be prevented from being the bottleneck. In this paper, the optimizing distance between transceivers and transmit power of each relay is proposed to obtain the upper bound of end-to-end channel capacity. However, in case(More)
Multiple-input multiple-output (MIMO) is known as an one of the most attractive candidates for large capacity. However, when signal to noise ratio (SNR) is decreased, the propagation character of MIMO is dropped rapidly. For re- maining the propagation character of MIMO and/or increasing a capacity, MIMO repeater systems have been discussed. In MIMO multi(More)
For high end-to-end channel capacity, the amplify-and-forward scheme multiple-hop multiple-input multiple-output relay system is considered. The distance between each transceiver and the transmit power of each relay are optimized to prevent some relays from being the bottleneck and guarantee high end-to-end channel capacity. According to the proposed(More)