Results 1 -
6 of
6
Transaction on IoT and Cloud Computing 1(1) 1-16 2013 Cooperative Spectrum Sharing of Cellular LTE-Advanced and Broadcast DVB-T2 Systems
"... The allocation of parts of the Ultra High Frequency (UHF) band to In-ternational Mobile Telecommunications (IMT) technologies on a co-primary basis with terrestrial broadcasting technologies has been the major change in worldwide spectrum allocation in recent years. Nowadays, thanks to the Second Ge ..."
Abstract
- Add to MetaCart
(Show Context)
The allocation of parts of the Ultra High Frequency (UHF) band to In-ternational Mobile Telecommunications (IMT) technologies on a co-primary basis with terrestrial broadcasting technologies has been the major change in worldwide spectrum allocation in recent years. Nowadays, thanks to the Second Generation for Terrestrial Digital Video Broadcasting (DVB-T2) and the Long Term Evolution Advanced (LTE-A) technologies a new mod-el of cooperation between cellular and broadcasting systems arises, where the cellular network can use of broadcast spectrum using time multiplexing. This paper proposes the cooperative spectrum sharing of DTT spectrum be-tween DVB-T2 systems and LTE-A cellular networks by means of the use of DVB-T2 FEF for LTE-A analyzing the potential benefit.
ENABLING THE IMPLEMENTATION OF SPATIAL INTERWEAVE LTE COGNITIVE RADIO
, 2013
"... LTE the latest mobile network standard, is widely adopted and targets high spectral efficiency. Cognitive radio (CR) systems on the other hand enable smart use of wireless resources leading to significant performance and reliability improvement. Accordingly, adopting the LTE specifications in CR it ..."
Abstract
- Add to MetaCart
(Show Context)
LTE the latest mobile network standard, is widely adopted and targets high spectral efficiency. Cognitive radio (CR) systems on the other hand enable smart use of wireless resources leading to significant performance and reliability improvement. Accordingly, adopting the LTE specifications in CR it is a reasonable choice to optimized the spectrum utilisation in wireless communications. In this paper, we investigate some issues in the real-time implementation of a TDD (time division duplex) LTE-based spatial interweave (IW) CR. Indeed, the IW-CR requires the channel state information (CSI) to opportunistically exploit spatial holes for cognitive transmissions. Preliminary works have illustrated the possibility to acquire the CSI through the calibration of the channel reciprocity inherent in TDD systems. However, they consider constant radio frequency (RF) filters, which leads to perturbations in the IW-CR. Hence, we propose a new tracking method to tackle the variation in the RF. The whole system is implemented and evaluated on an experimental platform, where the simulation results reveal performance enhancement using this new approach.
Coexistence of LTE and WLAN in Unlicensed Bands: Full-Duplex Spectrum Sensing
"... Abstract—Problem of opportunistic use of the unlicensed 5-GHz band for LTE carrier aggregation (LTE unlicensed) is studied from the point-of-view of cognitive full-duplex transceivers. In this paper, an initial study of the impact of self-interference on the performance of cyclostationary spectrum s ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract—Problem of opportunistic use of the unlicensed 5-GHz band for LTE carrier aggregation (LTE unlicensed) is studied from the point-of-view of cognitive full-duplex transceivers. In this paper, an initial study of the impact of self-interference on the performance of cyclostationary spectrum sensing algorithm is given, in case where a full-duplex transceiver tries opportunistically use parts of the band used by a WLAN signal. Effective sensing while transmitting is natively possible, because WLAN and LTE signals have different cyclic properties. The evaluation of the impact focuses on extensive system simulations and simulation analysis. It is concluded that the self-interference can indeed interfere with the cyclostationary spectrum sensing. However, the effect can be lowered by lowering the bandwidth of the aggregated signal and instead using higher spectral density for the lower bandwidth signal. Keywords—LTE unlicensed; full-duplex radio; spectrum sensing; cyclostationary spectrum sensing I.
HYBRID EFFICIENT BANDWIDTH ALLOCATION TECHNIQUE FOR COGNITIVE LTE NETWORKS
"... Now days, use of IEEE 802.22 based LTE network is growing worldwide due to its high speech capability. IEEE 802.22 is nothing but cognitive radio networks which are suffering from problems like efficient bandwidth and spectrum allocation, delay and loss ratio etc. In addition to this there is anothe ..."
Abstract
- Add to MetaCart
(Show Context)
Now days, use of IEEE 802.22 based LTE network is growing worldwide due to its high speech capability. IEEE 802.22 is nothing but cognitive radio networks which are suffering from problems like efficient bandwidth and spectrum allocation, delay and loss ratio etc. In addition to this there is another research problem in this domain called power efficiency. Many methods already presented in literature, however most of methods failed to achieve the tradeoff between, transmission power, transmission rate, and bandwidth. In this paper we are extending two kinds of techniques presented such as QBC1 and QBC2 which are variants of main QBC (Queue Based Control) algorithm presented. QBC1 and QBC2 mean for different conditions of LTE network. Performance of QBC1 and QBC2 showing that QBC1 is having better Delay and Los performance as compared to QBC2, and QBC2 is having better power consumption performance as compared to QBC1. Therefore we are presenting hybrid technique which is known as HQBC (Hybrid QBC), which is main goal of improving performance in terms of los, delay, and power consumption as compared to QBC1 and QBC2. This can be achieved by using concept of multilevel queues and dynamic network adaptation.
Transaction on IoT and Cloud Computing 1(1) 1-12 2013 Cooperative Spectrum Sharing of Cellular LTE-Advanced and Broadcast DVB-T2 Systems
"... The allocation of parts of the Ultra High Frequency (UHF) band to International Mobile Telecommunications (IMT) technologies on a co-primary basis with terrestrial broadcast-ing technologies has been the major change in worldwide spectrum allocation in recent years. Nowadays, thanks to the Second Ge ..."
Abstract
- Add to MetaCart
(Show Context)
The allocation of parts of the Ultra High Frequency (UHF) band to International Mobile Telecommunications (IMT) technologies on a co-primary basis with terrestrial broadcast-ing technologies has been the major change in worldwide spectrum allocation in recent years. Nowadays, thanks to the Second Generation for Terrestrial Digital Video Broad-casting (DVB-T2) and the Long Term Evolution Advanced (LTE-A) technologies a new model of cooperation between cellular and broadcasting systems arises, where the cellular network can use of broadcast spectrum using time multiplexing. This paper proposes the cooperative spectrum sharing of DTT spectrum between DVB-T2 systems and LTE-A cellular networks by means of the use of DVB-T2 FEF for LTE-A analyzing the potential benefit.
2013, pp.1. <hal-00865331>
, 2013
"... HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte p ..."
Abstract
- Add to MetaCart
(Show Context)
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. 1 2
