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In this paper, the security aspect of an amplify-and-forward relaying network with untrusted relay nodes is considered. The untrusted nodes can help to forward the received signal and they may also try to decode such information, which can be regarded as potential eavesdroppers (Eves). To deal with such a challenging issue, a successive relaying scheme is adopted, where the multi-antenna source transmits...
In this paper, the mode selection (underlay or overlay) for device-to-device (D2D) links at low layers is jointly analyzed with the video coding mode selection and multiple transmission path selection at high layers. For each packet, three video coding modes (I, P, and B) and three transmission paths (cellular link with/without the shared relay and D2D link) are considered to optimize the received...
This paper analyzes the selection of underlay (reuse mode) or overlay (dedicated mode) for device-to-device (D2D) communication in a multi-cell scenario with shared relays. Two reuse cases that D2D communication reuses the same uplink resources or downlink resources as for cellular communication are considered. The study focuses on the location changes of cellular user, the distance changes of D2D...
In this paper, beam steerable antenna is deployed in mobile relay station (MRS) on vehicles to increase the link reliability and system flexibility in mobility. With only a single radio frequency (RF) chain, various beam patterns can be formed and selected electronically in a simple and low cost way. We proposed beam switching mechanism to mitigate neighboring interference and improve handover performance...
D2D communication in LTE-A cellular networks can improve overall system performance such as throughput and power consumption substantially and can enable and enhance many proximity based applications. This research topic gains great interest in both academic and industrial fields in recent years. The relevant 3GPP standardization on D2D communication has already begun in several discussion groups...
In this paper, a new radiation pattern reconfigurable antenna is designed for mobile relay station (MRS) on vehicles to increase the link reliability and system flexibility in mobility. With only a single radio frequency (RF) chain, various beam patterns can be formed and selected electronically in a simple way. The design and corresponding beam switching mechanism are demonstrated through an experimental...
This paper investigates the resource allocation problem in a relay-aided cognitive radio (CR) system under the orthogonal frequency division multiplexing (OFDM) transmission. Different from the conventional CR resource allocation problem, the relay node here is capable of performing subcarrier permutation over two hops such that the signal received over a particular subcarrier is forwarded on a different...
We develop an optimization technique for a two way asynchronous relay network. A space-time processing based transceiver is proposed for spatial multiplexing in a two-way relay network. The optimization aims to minimize the transmission power at the relays while satisfying the signal to interference-plus-noise ratio (SINR) target for each user. The problem is solved using semidefinite programming.
In the relay-enhanced cellular network, the target user will receive uncertain interference due to orthogonal transmission between BS and RS, which would make the traditional mechanisms of link adaptation and channel-aware scheduling invalid. In this paper, a novel resource scheduling scheme is proposed with a semi-static mode, in which dominant interferences for a target user are identified and inter-cell...
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