Experimental evaluation of an adaptive antenna for a TDMA mobile telephony system

Strandell, J.; Wennstrom, M.; Rydberg, Anders; Oberg, T.; Gladh, O.; Rexberg, L; Sandberg, E.; Andersson, B.V.; Appelgren, M.

doi:10.1109/pimrc.1997.624367

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…Due to the spatial filtering function of SA, co-channel interferences may be reduced at both transmit and receive side by forming beams with nulls in the direction of those SS who share the same spectrum band [10][11][12]. As a result, it may lead to an increased number of users [13,14], which consequently improves the channel capacity and spectrum efficiency [15].…”

Section: Pervasive Adaptive Beamforming Techniques For Wireless Commumentioning

confidence: 99%

Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX

Lian

Nikookar

Ligthart

2011

Wireless Pers Commun

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In this paper, we introduce Adaptive Beamforming (AB) and Distributed Beamforming (DB) as two efficient techniques for Intelligent WiMAX (I-WiMAX). I-WiMAX is a new maritime communication system, consisting of Smart Radio (SR) principles and mobile WiMAX based on the IEEE 802.16e standard. Adopting AB, the same spectrum can accommodate more users by directing the main beam towards desired users while antenna pattern nulls towards others. To reduce the channel interferences caused by spectrum reusing, the Null Broadening (NB) method is required for downlink beamforming of I-WiMAX. A new NB method is presented in this paper with iterative weights computing for different OFDM subcarriers. Considering the spatial channel model seen at Subscriber Stations (SS) based on the von Mises distribution, the coverage range of one Base Station (BS) is dramatically enlarged by employing the NB technique. Meanwhile, assuming those SS which are within the coverage range as nodes of a relay network, the DB technique is introduced to forward signals to distant SS by forming the main beams towards them instead of deploying more BS to increase the communication range. It is proven in this paper that DB can successfully do the job. To reuse the spectrum, two DB methods are presented by directing different beams towards different required directions at the same time. With the AB and DB techniques, reliable I-WiMAX links can be established for long distances, with more optimum spectrum use and less infrastructure.

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Section: Pervasive Adaptive Beamforming Techniques For Wireless Commumentioning

confidence: 99%

Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX

Lian

Nikookar

Ligthart

2011

Wireless Pers Commun

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“…30 dB in CIR was obtained in a line of sight (LOS) propagation scenario. It was observed that different spatial signatures and low crosscorrelation between training are enough for separation even for signals with the same angular position in the presence of CCI [50]. It was possible to maintain error-free transmission with minimum a 10 degrees angular between desired and interfering signals when CIR = -20 dB.…”

Section: Existing Sa Experimental Systems and Commercially Available mentioning

confidence: 99%

System aspects of smart-antenna technology in cellular wireless communications-an overview

Boukalov¹,

Häggman²

2000

IEEE Trans. Microwave Theory Techn.

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We surveyed the three main system aspects of smart antenna (SA) technology in wireless communications i.e. SA receiver, wireless network control and planning with SA. A classification of SA receivers and their algorithms is given in order to simplify orientation in a very large amount of structures and algorithms. We discuss system integration of SA receivers taking into consideration expected propagation conditions, user mobility and offered traffic. Several radio network planning and upgrading concepts associated with SA are evaluated. We describe possible radio networks architectures when smart antennas are used at the mobiles, base stations or at both ends. Radio network control functions with SA at the different layers are briefly examined. Existing experimental and commercially available SA and their performance are surveyed.

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“…1, measurements of the temperature drift in amplitude and phase for the hardware weighting unit used in an ABF testbed described in [5,6], is presented. The measurements were performed over a period of 10 h after a cold start-up.…”

Section: Introductionmentioning

confidence: 99%

Auto-calibrating adaptive array for mobile telecommunications

Wennstrom

Strandell

Oberg

et al. 2000

IEEE Trans. Aerosp. Electron. Syst.

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Experimental evaluation of an adaptive antenna for a TDMA mobile telephony system

Cited by 12 publications

References 5 publications

Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX

Efficient Radio Transmission with Adaptive and Distributed Beamforming for Intelligent WiMAX

System aspects of smart-antenna technology in cellular wireless communications-an overview

Auto-calibrating adaptive array for mobile telecommunications

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