Results 261 to 270 of about 40,023 (305)

A hexagonal antenna array prototype for adaptive system application

The 5th International Symposium on Wireless Personal Multimedia Communications, 2003
Adaptive antennas arrays have been recognized as an excellent method to improve the performance of the next generation of wireless communication systems. This work describes the optimization of a novel array prototype with seven patch elements in a hexagonal arrangement.
L.C. Kretly, A. Cerqueira S, A. Tavora AS   +2 more
openaire   +1 more source

Fixed multibeam antennas versus adaptive arrays for CDMA systems

Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324), 1999
We compare the performance of fixed multibeam antennas versus adaptive beamforming for the reverse link of IS-95 systems. A simulation model for analyzing the performance of antenna arrays in a mobile fading environment with closed loop power control is derived and applied to realistic scenarios.
H.J. Xing, J.R. Cruz, null Yiping Wang
openaire   +1 more source

Adaptive beamforming algorithm for OFDM systems with antenna arrays

IEEE Transactions on Consumer Electronics, 2000
This paper presents an adaptive beamforming algorithm for an OFDM system with an adaptive array antenna. The proposed algorithm for adaptive beamforming in the OFDM system is derived by (1) calculating the pilot error signals in the frequency domain, (2) transforming the frequency-domain error signals into time-domain error signals, (3) updating the ...
null Chan Kyu Kim, null Kwangchun Lee, null Yong Soo Cho   +2 more
openaire   +1 more source

Characterization system for radio channel of adaptive array antennas

Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97, 2002
This paper describes a multichannel measurement system for the analysis of the radio channel of adaptive array antennas. It provides real-time recording of signals from multiple input channels. Due to this multielement reception, the incidence angles of the received signal components can be resolved.
K. Kalliola, P. Vainikainen
openaire   +1 more source

Problems of implementing adaptive array antennas in CDMA systems

Ninth IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (Cat. No.98TH8361), 2002
In this paper, we discuss the performance of a system in which multiprocessing gain (MPG) spread spectrum signals are transmitted to a base station within the same bandwidth. At the receiver of the base station, an adaptive array antenna is employed. We evaluate the system performance in terms of signal to interference-and-noise ratio (SINR) and also ...
A. Morimoto, M. Katayama, T. Yamazato, A. Ogawa   +3 more
openaire   +1 more source

Adaptation of the Wideband System Antenna Array Directional Pattern

2019 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon), 2019
The article proposes to control the shape of the antenna array pattern by creating an amplitude-phase distribution at the aperture of the antenna array. In the MatLab environment, a simulation was carried out, confirming the hypothesis that it was possible to adapt the array pattern to specified operating conditions. It has been analytically shown that
A.V. Bazhenov, S.V. Malygin, N.V. Grivennaya   +2 more
openaire   +1 more source

Experimental GSM Test Bed for Adaptive Array Antenna System

1999
An experimental activity to verify the advantages and limits of the Smart Antenna technique applied to the GSM mobile radio interface is described.
G. Bucci, A. Colamonico, M. Donati, M. Politi, A. Picciriello   +4 more
openaire   +1 more source

An improved beamformer for OFDM system with adaptive antenna array

Proceedings. 2005 International Conference on Wireless Communications, Networking and Mobile Computing, 2005., 2005
In wireless communication system, orthogonal frequency division multiplexing (OFDM) can be used with multiple antennas to achieve both frequency diversity and space diversity. Many methods have been proposed to decide the weight set for beamformer. In this paper, we proposed an improved method to derive the weight set by exploiting the virtual sub ...
null Yu Li, null Yujie Gu, null Wang Ren, null Kangsheng Chen   +3 more
openaire   +1 more source

Robust adaptive beamforming for surveillance system using 2D antenna array

2014 Tyrrhenian International Workshop on Digital Communications - Enhanced Surveillance of Aircraft and Vehicles (TIWDC/ESAV), 2014
In this paper we propose an algorithm for 2D antenna array that can be used in ground surveillance systems. Due to the multipath propagation of signals robustness against imperfect knowledge about direction of arrival (DOA) is needed. We achieve the needed robustness by using two dimensional Slepian window functions.
Allan Tart, Tonu Trump
openaire   +1 more source

A compact dual‐element antenna array for adaptive MIMO system

Microwave and Optical Technology Letters, 2008
AbstractA novel compact dual‐element antenna array is proposed for adaptive MIMO system. By four embedded PIN diodes in the feeding network, the antenna array has three different working states. It can operate as a dual‐element antenna array or work as a single antenna while the unselected antenna is terminated to a lumped matched resistor.
Xuan Wang, Zhengwei Du, Ke Gong
openaire   +1 more source