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Spiros Louvros
American Hotel & Lodging Educational Institute
43Publications
6H-index
129Citations
Publications 43
Newest
Dec 1, 2014 in CAMAD (Computer Aided Modeling and Design of Communication Links and Networks)
#1Spiros Louvros (AHLEI: American Hotel & Lodging Educational Institute)H-Index: 6
Last.Agamemnon Baltagiannis (University of Patras)H-Index: 3
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LTE cell planning requires special constraints in case of smart grid applications. Cell planners decide about the cell coverage mostly based on worst radio conditions (cell edge) acceptable level of minimum throughput, but not on delay constraints which are of extreme importance for smart grid solutions. In this paper a semi-analytical approach for uplink cell planning with delay constraints for smart grid applications is proposed, using theoretical outputs from analytical mathematical models co...
#1Spiros Louvros (AHLEI: American Hotel & Lodging Educational Institute)H-Index: 6
#2Michael Paraskevas (AHLEI: American Hotel & Lodging Educational Institute)H-Index: 6
Estimating average throughput and packet transmission delay for worst case scenario (cell edge users) is crucial for LTE cell planners in order to preserve strict QoS for delay sensitive applications. Cell planning techniques emphasize mostly on cell range (coverage) and throughput predictions but not on delay. Cell edge users mostly suffer from throughput reduction due to bad coverage and consequently unexpected uplink transmission delays. To estimate cell edge throughput a common practice on i...
#1Spiros Louvros (Technological Educational Institute of Messolonghi)H-Index: 6
#2David Fuschelberger (Technological Educational Institute of Messolonghi)H-Index: 1
Long-term evolution (LTE) indoor coverage, owing to its importance, is becoming very important for cellular operators lately. In international literature, there is a lot of research regarding visible light communication (VLC), especially indoor, to improve the expected throughput. To meet user expectations on operator’s indoor high-quality services and to provide adequate capacity availability, special issues have to be studied. Indoor users expect faster Internet with less interference and heal...
#1Spiros Louvros (Technological Educational Institute of Messolonghi)H-Index: 6
#2Vassilios Triantafyllou (Technological Educational Institute of Messolonghi)
Last.George Asimakopoulos (Technological Educational Institute of Messolonghi)H-Index: 1
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Long-term evolution (LTE) indoor coverage is becoming important day by day due to multilayer design and high traffic-building premises. Nowadays, it is true that user expectations from operator’s indoor high-quality services and capacity availability provides a well-promised opportunity to offer improved LTE services with appropriate traffic revenues. Customers expect indoor faster Internet connections than ever and they would not tolerate slow connections. Wireless network indoor capacity for d...
#1Spiros Louvros (Technological Educational Institute of Messolonghi)H-Index: 6
#2Angelina Gkioni (Technological Educational Institute of Messolonghi)H-Index: 1
This chapter provides a short introduction to the voice over long-term evolution (VoLTE). According to 3G Patent Platform (3GPP) release 8, LTE was introduced providing higher access rates and lower latency and more efficient use of radio network resources, which means lower cost per transmitted bit and voice spectral efficiency. Circuit-switched domain was excluded and all applications—services are implemented as packet-switched services. In 2009, the One Voice alternative was published by a nu...
May 1, 2012 in NTMS (New Technologies, Mobility and Security)
#1Spiros LouvrosH-Index: 6
Last.George Economou (University of Patras)H-Index: 19
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This paper proposes a semi-analytical medium access control (MAC) layer model for the macroscopic analysis of long term evolution (LTE) uplink. The model takes into consideration the expected number of retransmissions arising from channel disturbances and the number of allocated resources so that to satisfy a required packet delay budget. The former is computed in terms of the mean bit error probability while the latter is calculated through a high order Markov chain incorporating cell traffic l...
Apr 1, 2012 in WTS (Wireless Telecommunications Symposium)
Last.Agamemnon Baltagiannis (University of Patras)H-Index: 3
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Uplink planning considerations for LTE FDD networks is considered to be essential, providing guaranteed service minimum requirements at cell edge by considering operator determined minimum throughput. Uplink user throughput is mostly degraded due to in-band interference, depending on neighbor cell load conditions and on the same time is increased due to higher MIMO rank configuration. In this paper uplink simulation analyses have been conducted to calculate cell average capacity considering and ...
This paper analyzes the performance of Walsh-Hadamard coded modulation schemes that arise by traditional spreading and multiplexing of antipodal information bits with standard Walsh-Hadamard matrices, over fully interleaved flat Rayleigh fading channels. The resulting Pulse Amplitude Modulation (PAM) constellations are processed by an optimum Maximum A posteriori Probability (MAP) vector detector at the receiver, including external diversity combining. Tight upper and lower bounds are derived fo...
Mar 22, 2012 in PSATS (Personal Satellite Services)
#1Constantinos T. Angelis (AHLEI: American Hotel & Lodging Educational Institute)H-Index: 9
#2Spiros Louvros (AHLEI: American Hotel & Lodging Educational Institute)H-Index: 6
This article presents a theoretical analysis for packet delay and simulation results for a realistic implementation of the Multi-User MIMO LTE Release 8 downlink standard in mobile satellite systems. Two Satellites, one Ground Station and two 2x2 MIMO Channels have been used as a basic configuration in the simulation scenarios and various key characteristics of the MIMO channel and the LTE radio interface, including physical layer and radio resource management functions ware simulated and their ...
This paper addresses the problem of calculating the number of active users in a cell on time t, given the total number of users entering the system from the beginning of the counting process. This calculation is especially useful for estimating the active users after a certain period of time, in order to optimize scheduling decisions. In applied wireless networks, the service time most usually follows a general distribution which for some simplified models can be considered as negative exponenti...
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