Πλοήγηση ανά Θέμα "Communication channels (information theory)"
Αποτελέσματα 1-18 από 18
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Blind channel estimation for downlink CDMA systems
(2003)The problem of channel estimation in code-division multiple-access (CDMA) systems is considered. Using only the spreading code of the user of interest, a technique is proposed to identify the impulse response of the multipath ... -
Carrier assignment algorithms for OFDM-based multi-carrier wireless networks with channel adaptation
(2008)We study carrier assignment in a single-cell multiuser OFDM multi-carrier system so as to satisfy user rate requirements with minimal resources. Different users experience different quality in different carriers due to ... -
A class of multi-carrier CDMA access methods for wide-bandwidth wireless channels
(2005)In this article we describe and evaluate a general class of synchronous multi-carrier CDMA methods. In the proposed methods each accessing user is encoded by a Hadamard sequence and a multi-carrier (MC) encoder. The ... -
A cooperative protocol for spectral-efficient cognitive relay networks
(2014)In this paper we propose a cooperative protocol for cognitive wireless networks that can improve the overall system spectral efficiency when a secondary user (SU) incorrectly transmits over the same resource with the primary ... -
Dynamic cross-layer association in 802.11-based mesh networks
(2007)In IEEE 802.11-based wireless mesh networks a user is associated with an access point (AP) in order to communicate and be part of the overall network. The association mechanism specified by the IEEE 802.11 standard does ... -
An efficient probing mechanism for next generation mobile broadband systems
(2012)Opportunistic scheduling exploits multiuser diversity for improving the performance of wireless systems. However, it requires instantaneous channel state information (CSI) to be available at the transmitter side. Since ... -
Exploiting cross-layer packet overhearing for opportunistic distributed STC in wireless relay networks
(2013)In this paper we propose a distributed Alamoutibased space-time code (STC) where opportunistic listening of packets from independent sources is exploited. Relays overhear broadcasted packets from multiple sources and ... -
A game theoretic framework for data privacy preservation in recommender systems
(2011)We address the fundamental tradeoff between privacy preservation and high-quality recommendation stemming from a third party. Multiple users submit their ratings to a third party about items they have viewed. The third ... -
Joint packet retransmission and spectrum sensing for cognitive radio networks
(2014)We model and simulate a joint design of packet retransmission through a hybrid automatic repeat request (HARQ) protocol at the data link layer and spectrum sensing (SpSe) at the physical layer for cognitive radio networks ... -
Lossy transmission of correlated sources in a multiple access quasi-static fading channel
(2016)In this paper, we investigate low-complexity, receiver-driven strategies for the transmission of two correlated sources in a multiple access quasi-static fading channel. We consider two different transmission modes at the ... -
MEC-Assisted panoramic VR video streaming over millimeter wave mobile networks
(2019)Panoramic virtual reality video (PVRV) is becoming increasingly popular since it offers a true immersive experience. However, the ultra-high resolution of PVRV requires significant bandwidth and ultra-low latency for PVRV ... -
Modeling the lossy transmission of correlated sources in multiple access fading channels
(2017)In this paper, we develop accurate distortion models for the lossy transmission of two correlated sources in a multiple access Rayleigh fading channel. We focus on a class of real-life communication systems, where the ... -
Multi-Source Cooperative Communication with Opportunistic Interference Cancelling Relays
(2015)In this paper, we present a multi-user cooperative protocol for wireless networks. Two sources transmit simultaneously their information blocks and relays employ opportunistically successive interference cancellation (SIC) ... -
New models for pedagogical inclusion of high quality industrial video solutions within distance training practices
(2006)Though state of the art visual communication and collaboration technology is considered mature, it has not yet been widely integrated into in-company educational settings, e.g. mechanical industry and welding practises. ... -
Optimal jamming attacks and network defense policies in wireless sensor networks
(2007)We consider a scenario where a sophisticated jammer jams an area in a single-channel wireless sensor network. The jammer controls the probability of jamming and transmission range to cause maximal damage to the network in ... -
Optimizing video quality in dense small-cell wireless networks with packet overhearing
(2014)The heterogeneous wireless network (HetNet) paradigm is based on the deployment of low power small cell base stations (SCBS) close to the user in parallel with a macrocell BS (MBS) that provides umbrella coverage. However, ... -
Spectrally-efficient cooperative video delivery in 5G Heterogeneous wireless networks
(2016)Heterogeneous cellular networks (HetNets), even in 5G systems, are plagued by the problem of intra cell interference, i.e., a strong interfering transmission from a macro BS (MBS) interferes at all the users associated to ... -
Video-aware relay selection in single-carrier and OFDM wireless systems
(2014)In this paper we consider packetized video transmission in cooperative relay-based wireless networks. We propose algorithms for optimized relay selection that take into account the content of each specific video packet. ...