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In this paper, a novel scheme for MSOT scenario (multi-service on one terminal)using link sharing to guarantee service continuity is proposed. Fuzzy control theory is applied for designing the sharing strategy. The functionalities of mobile terminal for link sharing are modular design considering easy implementation. The performance of the proposed algorithm is analyzed and compared with fixed percentage...
Record wireless data transmission of 31.4 Gbps within 7 GHz license-free band at 60 GHz is experimentally demonstrated using adaptive bit-loading OFDM modulation. Adaptive bit-loading OFDM also enables extended fiber transmission distances beyond 5km.
This paper reviews 60-GHz radio-over-fiber systems employing optical frequency multiplication and adaptive OFDM signals with multi-level modulation formats to achieve an ultra-high data rate of up to 32.65 Gbps within the 7-GHz license-free band.
We consider relay selection technique in a cooperative cellular network where user terminals act as mobile relays to help the communications between base station (BS) and mobile station (MS). A novel relay selection scheme, called Joint Uplink and Downlink Relay Selection (JUDRS), is proposed in this paper. Specifically, we generalize JUDRS in two key aspects: (i) relay is selected jointly for uplink...
Many factors such as the type and the orientation of capsule antenna, the position of the capsule antenna in gastrointestinal tract, the dielectric properties of human body tissues and so on can influence the radiation characteristics of Ingestible Wireless Devices (IWDs). This paper analyses the uncertainty of the radiation characteristics of IWD and how these factors influence the performance of...
In order to assess the compliance of Ingested Wireless Device (IWD) within safety guidelines, the Specific Absorption Rate (SAR) and near fields of IWD in two realistic human body models whose dielectric values are changed from the original by ±±10 and ±±20% are studied using the Finite-Difference Time-Domain (FDTD) method. The radiation characteristics of the IWD in the human body models with changed...
The scenario that different RATs are used to satisfy mobile user's two or more application requirements simultaneously in heterogeneous network is called multi-service environment. Recently, powerful multi-mode wireless terminal, which is suitable for multi-service situation, has become the test product. The mobility management (MM) issues, especially handover, of different interfaces in the test...
In this paper, we focus on the development of effective and practical scheduling algorithm for heterogeneous services per user of orthogonal frequency division multiplexing distributed antenna systems (OFDM-DAS). We take two scenarios into account: 1)Fixed distributed antenna connection (FDAC), in which each user can connect to only one distributed antenna (DA) port; 2)Dynamic DA connection (DDAC)...
In this paper, heterogeneous services in multiuser multiple-input multiple-output (MIMO)-Relay systems are investigated, where the relays work in amplify-and-forward mode. A utility based adaptive scheduling algorithm is proposed, which aims to maximize user satisfaction as well as system spectral efficiency. Joint optimal carriers and spatial subchannels allocation is considered based on the proposed...
Wireless sensor networks are widely used in a variety of commercial and military applications. As a fundamental requirement for providing security functionality in sensor networks, key management plays an essential role in authentication and encryption. In this paper, we propose a Refined Key Link Tree (RKLT) scheme that incorporates dirty key path into the key link tree-based group key management...
In heterogeneous wireless networks, rank aggregation based on multiple decision factors has recently been proposed as a useful approach for network selection. For each decision factor, a rank of the candidate networks is derived according to the value of this decision factor. Then these decision factor dependent ranks are aggregated into a single rank and the top one is considered as a favorite network...
In this paper, the capture effect is taken into the performance analysis of the IEEE 802.11 DCF in a wireless local area network. Different from the previous literatures that were based on the Rayleigh fading channels model, we consider the capture phenomenon with the more general Rician fading channels for the first time in order to present a performance analysis method which can provide a more realistic...
This paper proposes maximum utility principle slide handover strategy for multi-antenna cellular architecture. Based on generalized distributed cellular architecture-group cell, slide handover strategy is illustrated and its merits are presented. Slide antenna window is applied by slide handover in the handover process, which makes users always in the cell centre and eliminates cell-edge effect. But...
Multiple input multiple output (MIMO) system has been recognized as a promising candidate for future wireless communication. The adaptive modulation which adjusts the transmitter parameters, such as modulation order, transmit power or coding rate, to time-varying channel conditions has been applied to MIMO system and shown a good average spectral efficiency performance. In this paper, the channel...
This driven by the need to promote a more efficient use of radio resources and improve the operators' profits, resource allocation has turned into a joint technical and economical problem. At the same time, as a possible enabling solution, game theory has been applied to either dynamic spectrum access (DSA) or joint radio resource management (JRRM) in wireless communication research recently. In this...
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