Design and implementation of an adaptive antenna for mobile communications (ADAM)
Manuel Sierra PérezMiguel Calvo RamónLeandro de Haro ArietJosé Luis Fernández JambrinaBelén Galocha IragüenManuel Sierra CastañerRamón Martínez Rodríguez‐Osorio
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This paper describes the implementation of a simplified version of an adaptive antenna that can be applied to standard UMTS Node-B, both in the up and down links. The prototype includes the radiating elements, the RF and IF subsystem, the digital MODEM and the adaptive array algorithms.Keywords:
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A novel simulation testbed based on HILS (hardware-In-the-loop simulation) technology is described for space-time signal processing in a TDMA anti-jamming smart antenna receiver system. The testbed serves the space-time signal processor as a powerful and effective tool in its verification and debugging. The function and target of the simulation testbed is analyzed first. The architecture of this testbed and the implementation of each sub-system are then detailed. Some key technologies are also presented.
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This paper gives a description of a hardware testbed for evaluation of adaptive base station antenna arrays in the GSM/UMTS. The testbed is aimed at the spatial and temporal characterisation of the radio channel and at the performance evaluation of array processing algorithms. The testbed consists of two test mobiles and an 8 element adaptive array receiver. The array processing is implemented by means of real-time digital signal processing hardware.
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Smart antenna technologies are emerging as an innovative way to meet the growing demand for more powerful, cost-effective and highly efficient wireless communication systems. In this project, from broad category of smart antenna techniques, the switch beam digital-beamforming technique in the downlink is deployed to improve the fidelity and performance of WiMax application. In this regards, the designed system forms and steer the beam according to the user location which is known to the system. In addition, the system performs sidelobe cancellation base on the chebyshev algorithm to optimize the antenna radiation pattern. The design and implementation steps are as follow: the system is firstly modeled by MATLAB software. After modeling, the algorithm is implemented in DSP by using C and Code Composer Studio. After DSP hardware implementation, the signal management is performed in DSP before transmission to the FPGA board. This management is necessary, in order to make processed signal in DSP suitable for channel separation process in FPGA. FPGA is deployed to split the data stream into sixteen channels corresponding to number of antenna elements. Next, the FPGA and DSP are integrated together to form the baseband switch beam smart antenna system. After integration process, the hardware is tested; the results prove that the system functions properly as we expected from simulation model. In this project, lastly, the initial design of IF, RF-front-end and their necessary circuits are also portrayed to be used in the next smart antenna research project.
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Wideband tab monopole antenna array for wireless adaptive and mobile information systems application
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A smart antenna base station (SA-BTS) for GSM/DCS system has been designed to quantify the advantages of adaptive array processing. The architecture and the hardware platform have been chosen to have a flexible system for testing the performances of different space-time receivers both in laboratory and in field. The improved performance of adaptive antenna systems with respect to standard BTS are confirmed by tests carried out for different adaptive array algorithms.
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In state-of-the-art mobile devices (MDs), non-radio contexts (i.e., non-real-time data) provided by various sensors have been excluded in determining the modem configuration because of the problems in applying them in real-time modem operations. This paper presents a reconfiguration procedure and hardware implementation of a European Telecommunications Standards Institute (ETSI)-standard reconfigurable MD with a multi-antenna system. Borrowing the ETSI-standard architecture, the proposed MD can exploit a high-level abstraction of configuration-related operations, which consequently provides its application processor operating in non-real-time domain a uniform way of managing the multi-antenna-related hardware platform operating in real time. The configuration of the proposed MD is determined in accordance with non-radio and radio context information for opportunistically utilizing multiple antenna resources. From an implemented multi-antenna MD system operating in an indoor layout and computer simulations of the multi-antenna MD operating in a modeled outdoor layout, we verify that the MD configuration can be optimized in accordance with radio and non-radio contexts not only for fixed indoor but also for mobile outdoor environments. This enables the multi-antenna MD to efficiently utilize its antenna resources, such that the throughput maximization and/or power consumption minimization can be achieved.
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