1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
The paper presents results for the likely capacity improvement when an adaptive multibeam antenna... more The paper presents results for the likely capacity improvement when an adaptive multibeam antenna is used in conjunction with air interface parameters akin to the DCS1800 system. The analysis investigates the possible capacity enhancement whilst taking into account parameters such as power control, number of available handover channels, radiation pattern, radio channel characteristics and different frequency reuse patterns. The results
2008 3rd International Symposium on Wireless Pervasive Computing, 2008
Scope of this paper is to analyse four subcarrier allocation algorithms for multicellular OFDMA n... more Scope of this paper is to analyse four subcarrier allocation algorithms for multicellular OFDMA networks, namely coordinated, sequential, random and an innovative technique of cell splitting, that uses both random and coordinated subcarrier allocation. Common characteristic of these subcarrier allocation algorithms is that they do not require knowledge of channel state information (CSI) at the transmitter, a fact that leads to more efficient use of available bandwidth, lower algorithmic complexity and faster decision making. The algorithms are studied for an OFDMA multicellular network. Simulation results show that a multicellular OFDMA network is able to provide real broadband wireless access, with offered bit rate to reach 20 Mbps per cell, even without CSI knowledge.
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
Adaptive antennas are among the favourite techniques to help the current systems evolve towards t... more Adaptive antennas are among the favourite techniques to help the current systems evolve towards third generation mobile communication systems. However, among the major concerns for adaptive antenna systems are the calibration process and the non-linearity effects of the RF-IF chains upon the performance of the beamforming network. This article investigates these issues based on experimental results produced with the adaptive
Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications, 1995
This paper considers the performance of a DS-CDMA system which employs adaptive antenna technolog... more This paper considers the performance of a DS-CDMA system which employs adaptive antenna technology at the basestation site. By utilising the capability of ray-tracing to provide the complex channel impulse response, a new ray-based simulation methodology for an adaptive antenna in a DS-CDMA system is presented. Results for a typical microcellular environment highlight the behaviour of the adaptive antenna. Finally,
... George V. Tsoulos, Mark A. Beach, Simon C. Swales ... one user, and the error signal is defme... more ... George V. Tsoulos, Mark A. Beach, Simon C. Swales ... one user, and the error signal is defmed as the difference between the array output and the desired signal e(k) y(k)- roCk). ... [12] Array Signal Processing: Concepts and Techniques, DHJohnson and DEDudgeon, Prentice ...
Proceedings of IEEE Vehicular Technology Conference (VTC), 1994
... This paper will present an overview of the proposed mixed cell architecture employing adaptiv... more ... This paper will present an overview of the proposed mixed cell architecture employing adaptive antenna technology at the Umbrella cell ... 1.C.Symington & E.Green. ... JPMc-G.Norton, "Rake decorrelation BS an alternative to rapid powex control in DS-CDMA mobile radio", IEEE ...
Proceedings of Vehicular Technology Conference - VTC, 1996
This paper considers the performance of a DS-CDMA system which employs adaptive antenna technolog... more This paper considers the performance of a DS-CDMA system which employs adaptive antenna technology at the base station site of a microcell. By utilising the capability of ray-tracing to provide the complex channel impulse response, a new ray-based simulation methodology for an adaptive antenna in a DS-CDMA system is presented. Results for a typical microcellular environment highlight the behaviour of the adaptive antenna. Finally, with the help of a Monte-Carlo type DS-CDMA capacity analysis, the potential performance enhancement and the sensitivity of the system upon the misspointing of the main beam, are evaluated
... algorithms for voice loaded system [47] method (FM) shows slightly worse performance than the... more ... algorithms for voice loaded system [47] method (FM) shows slightly worse performance than the ... The analysis also showed that although the fixed beam approaches can give acceptable ... environments, the antenna array gain can be exchanged for signal quality enhancement, ie ...
Electronics & Communication Engineering Journal, 1999
... While great effort in current (second) generation wireless communication systems has been dir... more ... While great effort in current (second) generation wireless communication systems has been directed towards the development of modulation, coding and protocols ...
Spatial filtering for mobile communications has attracted a lot of attention over the last decade... more Spatial filtering for mobile communications has attracted a lot of attention over the last decade and is currently considered a very promising technique that will help future cellular networks achieve their ambitious goals. One way to accomplish this is via array signal processing with algorithms which estimate the direction-of-arrival (DOA) of the received waves from the mobile users. This paper
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
The paper presents results for the likely capacity improvement when an adaptive multibeam antenna... more The paper presents results for the likely capacity improvement when an adaptive multibeam antenna is used in conjunction with air interface parameters akin to the DCS1800 system. The analysis investigates the possible capacity enhancement whilst taking into account parameters such as power control, number of available handover channels, radiation pattern, radio channel characteristics and different frequency reuse patterns. The results
2008 3rd International Symposium on Wireless Pervasive Computing, 2008
Scope of this paper is to analyse four subcarrier allocation algorithms for multicellular OFDMA n... more Scope of this paper is to analyse four subcarrier allocation algorithms for multicellular OFDMA networks, namely coordinated, sequential, random and an innovative technique of cell splitting, that uses both random and coordinated subcarrier allocation. Common characteristic of these subcarrier allocation algorithms is that they do not require knowledge of channel state information (CSI) at the transmitter, a fact that leads to more efficient use of available bandwidth, lower algorithmic complexity and faster decision making. The algorithms are studied for an OFDMA multicellular network. Simulation results show that a multicellular OFDMA network is able to provide real broadband wireless access, with offered bit rate to reach 20 Mbps per cell, even without CSI knowledge.
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997
Adaptive antennas are among the favourite techniques to help the current systems evolve towards t... more Adaptive antennas are among the favourite techniques to help the current systems evolve towards third generation mobile communication systems. However, among the major concerns for adaptive antenna systems are the calibration process and the non-linearity effects of the RF-IF chains upon the performance of the beamforming network. This article investigates these issues based on experimental results produced with the adaptive
Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications, 1995
This paper considers the performance of a DS-CDMA system which employs adaptive antenna technolog... more This paper considers the performance of a DS-CDMA system which employs adaptive antenna technology at the basestation site. By utilising the capability of ray-tracing to provide the complex channel impulse response, a new ray-based simulation methodology for an adaptive antenna in a DS-CDMA system is presented. Results for a typical microcellular environment highlight the behaviour of the adaptive antenna. Finally,
... George V. Tsoulos, Mark A. Beach, Simon C. Swales ... one user, and the error signal is defme... more ... George V. Tsoulos, Mark A. Beach, Simon C. Swales ... one user, and the error signal is defmed as the difference between the array output and the desired signal e(k) y(k)- roCk). ... [12] Array Signal Processing: Concepts and Techniques, DHJohnson and DEDudgeon, Prentice ...
Proceedings of IEEE Vehicular Technology Conference (VTC), 1994
... This paper will present an overview of the proposed mixed cell architecture employing adaptiv... more ... This paper will present an overview of the proposed mixed cell architecture employing adaptive antenna technology at the Umbrella cell ... 1.C.Symington & E.Green. ... JPMc-G.Norton, "Rake decorrelation BS an alternative to rapid powex control in DS-CDMA mobile radio", IEEE ...
Proceedings of Vehicular Technology Conference - VTC, 1996
This paper considers the performance of a DS-CDMA system which employs adaptive antenna technolog... more This paper considers the performance of a DS-CDMA system which employs adaptive antenna technology at the base station site of a microcell. By utilising the capability of ray-tracing to provide the complex channel impulse response, a new ray-based simulation methodology for an adaptive antenna in a DS-CDMA system is presented. Results for a typical microcellular environment highlight the behaviour of the adaptive antenna. Finally, with the help of a Monte-Carlo type DS-CDMA capacity analysis, the potential performance enhancement and the sensitivity of the system upon the misspointing of the main beam, are evaluated
... algorithms for voice loaded system [47] method (FM) shows slightly worse performance than the... more ... algorithms for voice loaded system [47] method (FM) shows slightly worse performance than the ... The analysis also showed that although the fixed beam approaches can give acceptable ... environments, the antenna array gain can be exchanged for signal quality enhancement, ie ...
Electronics & Communication Engineering Journal, 1999
... While great effort in current (second) generation wireless communication systems has been dir... more ... While great effort in current (second) generation wireless communication systems has been directed towards the development of modulation, coding and protocols ...
Spatial filtering for mobile communications has attracted a lot of attention over the last decade... more Spatial filtering for mobile communications has attracted a lot of attention over the last decade and is currently considered a very promising technique that will help future cellular networks achieve their ambitious goals. One way to accomplish this is via array signal processing with algorithms which estimate the direction-of-arrival (DOA) of the received waves from the mobile users. This paper
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Papers by GEORGE TSOULOS