المؤلفون: Petar Popovski, Kei Sakaguchi, Namzilp Lertwiram

المصدر: Lertwiram, N, Popovski, P & Sakaguchi, K 2012, ' A study of Trade-off between Opportunistic Resource Allocation and Interference Alignment in Femtocell Scenarios ', IEEE Wireless Communications Letters, s. 356-359 . https://doi.org/10.1109/WCL.2012.051712.120268Test

مصطلحات موضوعية: FOS: Computer and information sciences, business.industry, Computer science, Information Theory (cs.IT), Computer Science - Information Theory, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Data_CODINGANDINFORMATIONTHEORY, Interference (wave propagation), Precoding, Control and Systems Engineering, Femtocell, Wireless, Resource allocation, Fading, Electrical and Electronic Engineering, business, Heterogeneous network, Interference alignment, Computer network, Communication channel

الوصف: One of the main problems in wireless heterogeneous networks is interference between macro- and femto-cells. Using Orthogonal Frequency-Division Multiple Access (OFDMA) to create multiple frequency orthogonal sub-channels, this interference can be completely avoided if each sub-channel is exclusively used by either macro- or a femto-cell. However, such an orthogonal allocation may be inefficient. We consider two alternative strategies for interference management, opportunistic resource allocation (ORA) and interference alignment (IA). Both of them utilize the fading fluctuations across frequency channels in different ways. ORA allows the users to interfere, but selecting the channels where the interference is faded, while the desired signal has a good channel. IA uses precoding to create interference-free transmissions; however, such a precoding changes the diversity picture of the communication resources. In this letter we investigate the interactions and the trade-offs between these two strategies.
This paper is submitted to IEEE Wireless Communications Letters

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75e4eddd106e4501c0cf2443958081bbTest
https://vbn.aau.dk/ws/files/72734895/2012_IEEE_WCL_Namzilp_Petar_Kei.pdfTest

المؤلفون: Ramjee Prasad, António Rodrigues, Joao Mestre, Neeli R. Prasad, Nuno K. Pratas

المصدر: Mestre, J A M, Kiilerich Pratas, N, Prasad, N R, Rodrigues, A & Prasad, R 2011, ' Adaptive flexible spectrum usage algorithms in heterogeneous cell deployment ', 22nd International IEEE Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), s. 253-257 . https://doi.org/10.1109/PIMRC.2011.6139960Test
PIMRC

مصطلحات موضوعية: business.industry, Computer science, Femto, Next-generation network, Femtocell, Wireless, Throughput, Macrocell, business, Interference (wave propagation), Algorithm, Computer network

الوصف: The International Telecommunication Union (ITU) established new requirements for the next generation of wireless communications. To meet those requirements, the concept of femtocells emerged as a solution, aiming at increasing capacity and offloading the macrocell network. In a co-channel deployment between macrocells and femtocells, the interference is a serious problem and that needs to be addressed. Since the femtocells are deployed by the end-user, the operator does not have a pre-planned solution to avoid interference, thus a self-organizing solution between femtocells located in the same area is required to manage the interference. In this paper we propose a flexible spectrum usage algorithm which runs at the femtocells, while the macrocells use a fixed reuse scheme in order to manage the interference in the network. In this study we verify that by assigning a fixed reuse scheme 1/3 for the macrocells, the performance achieved by the users is higher, when comparing the same scenario with reuse 1. We also propose a flexible spectrum usage algorithm for the femto cell, which is able to achieve higher user throughput in the femto layer and minimize the interference in the macro layer, when compared to a non-channel aware algorithm, which allocates the PRBs randomly.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68172391f3db8e237c3ac7cdc373470bTest
https://vbn.aau.dk/da/publications/32d174b8-0cd7-4bc1-9e26-5dfc47696ba3Test

المؤلفون: Jørgen Bach Andersen, Gert Frølund Pedersen, Hung T. Nguyen

المصدر: Nguyen, H T, Andersen, J B & Pedersen, G F 2005, ' The potential use of time reversal techniques in multiple element antenna systems ', IEEE Communications Letters, nr. 9, s. 40-42 . https://doi.org/10.1109/LCOMM.2005.0101Test

مصطلحات موضوعية: business.industry, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Use of time, Interference (wave propagation), Computer Science Applications, Interference (communication), Margin (machine learning), Modeling and Simulation, Electronic engineering, Wireless, Electrical and Electronic Engineering, Antenna (radio), Telecommunications, business, Multipath propagation

الوصف: Based on outdoor measurements we study the feasibility of applying the time reversal techniques (TR) in multiple element antenna (MEA) wireless communication systems. It is demonstrated that the use of TR in wireless communication has a promising potential in mitigating the effect of channel dispersion and especially in reducing the cochannel interference where a margin of 18 dB interference reduction has been obtained.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ac43b675563c0448d28a8d834e9d086Test
https://vbn.aau.dk/da/publications/2cd3718b-c8db-4443-948f-de6bb5d423e3Test

المساهمون: Christoffersen, G

المصدر: Other Information: UNCL. Orig. Receipt Date: 30-JUN-73

وصف الملف: Medium: X; Size: Pages: 42

الوصول الحر: http://www.osti.gov/scitech/biblio/4618819Test