نتایج جستجو برای: relay co

تعداد نتایج: 350238  

Journal: :IEICE Transactions 2013
Dongwook Choi Jae Hong Lee

This paper analyzes the performance of a two-way relay network experiencing co-channel interference from multiple interferers due to aggressive frequency reuse in cellular networks. We discuss two different scenarios: Outages are declared individually for each user (individual outage) and an outage is declared simultaneously for all users (common outage). We derive the closed-form expressions f...

2014
ALI KAMOUCH ZOUHAIR GUENNOUN

Spatial diversity is an inherent nature of wireless communications. This nature can be exploited to make communications more reliable by Multiple-Input-Multiple-Output (MIMO). However the use of multiple co-located antennas is constrained by the dimensions of modern devices. To overcome this drawback cooperative relaying shares antennas between different network nodes thus realizing a Virtual a...

2008
Jiwon Yoon Youn-Soo Kim Hyung Seok Kim

The IEEE 802.16j task group uses the relay station (RS) for the extension of the coverage of the BS and enhancement of throughput. However, if a number of relay stations in a BS cell, the RSs may result in both more frequent handover and higher co-channel interference. To solve this problem, the grouping is required specified in IEEE 802.16j basement document. The selecting method of parent RS ...

In this paper, our objective is maximizing total sum-rate subject to power constraints on total relay transmit power or individual relay powers, for amplify-and-forward single-antenna relay-based wireless communication networks. We derive a closed-form solution for the total power constraint optimization problem and show that the individual relay power constraints optimization problem is a quad...

2014
Babins Shrestha Nitesh Saxena Hien Thi Thu Truong N. Asokan

Many mobile and wireless authentication systems are prone to relay attacks whereby two non co-presence colluding entities can subvert the authentication functionality by simply relaying the data between a legitimate prover (P) and verifier (V). Examples include payment systems involving NFC and RFID devices, and zero-interaction token-based authentication approaches. Utilizing the contextual in...

Journal: :بوم شناسی کشاورزی 0
علی مومن رضا قربانی مهدی نصیری محلاتی قربانعلی اسدی مهدی پارسا

in order to study the effects of cropping systems and mulch application in relay intercropped styrian pumpkin (cucurbita pepo l.) with chickpea (cicer arietinum l.), a field experiment was conducted as factorial layout based on a randomized complete block design with three replications at the agricultural research station, college of agriculture, ferdowsi university of mashhad, during growing s...

Journal: :IJWIN 2014
Ömer Bulakci Jyri Hämäläinen Egon Schulz

Relay deployments promise to alleviate the limitations of conventional macrocell networks, such as poor indoor penetration and coverage holes in a cost-efficient way. In this context, the capacity of the wireless relay link between a relay node (RN) and its serving base station (BS) has a crucial impact on the end-to-end performance. The deployment flexibility of RNs, which mainly stems from th...

Journal: :Ad Hoc Networks 2015
Lei You Jianbo Li Changjiang Wei Lejuan Hu

Social Delay Tolerant Networks (SDTNs) are a special kind of Delay Tolerant Network (DTN) that consists of a number of mobile devices with social characteristics. The current research achievements on routing algorithms tend to separately evaluate the available profit for each prospective relay node and cannot achieve the global optimal performance in an overall perspective. In this paper, we pr...

H. Hashemi S. Akhlaghi,

This paper concerns power allocation in relay-assisted wireless channels for two-hop transmission. First, the transmitter sends the information to both the relay and receiver parts. Next, in the second hop, the transmitter cooperates with the relay to increase the received signal to noise ratio (SNR), assuming the relay makes use of the Amplify and Forward (AF) strategy. Moreover, it is assumed...

2005
K. R. Jacobson

The use of multi-hop relaying in cellular networks is considered a key technique for increasing data transmission rates and maximizing coverage in fourth generation (4G) wireless systems. With relaying, data destined for a mobile terminal will be relayed to a wireless relay station nearest the terminal rather than being transmitted from a more distant base station. Selection of the best relay r...

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