| 1. |
- Beckman, Claes, 1962-, et al.
(författare)
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Base station antennas for mobile communications
- 2007
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Ingår i: 2007 IEEE International Symposium on Antennas and Propagation.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This course gives the participants a general overview of the application, implementation and design of current and future base station antennas for mobile communications. It is aimed at microwave, RF- and antenna engineers in the wireless area, but also useful for researchers looking for relevant research topics and system engineers needing a deeper understanding of the antenna component of their system. The course explains underlying theoretical and practical implementation aspects of base station antennas in mobile communication networks of today and the future. The course is divided into three main parts: (i) System Aspects, (ii) BTS Antenna Design, (iii) Diversity and MIMO In the first part the fundamental parameters of a base station antenna are discussed in the context of radio network design. In particular we discuss parameters such as gain, radiation patterns, frequency bands and power handling and put them in the context of cell planning, propagation and capacity. In the second part a general overview of base station antenna design is given. In particular the design aspects of radiators, feed networks and reflectors are discussed. Furthermore, a general discussion of array synthesis for base station antennas is given. In the final part of the course we give an overview of the underlying theory of diversity and MIMO systems. In particular we discuss the requirements that these systems put on the base station antennas in order to be able to deliver the data rates expected from WiMAX and the long term evolution of 3G systems.
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| 2. |
- Beckman, Claes, 1962-, et al.
(författare)
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Ett ödesval för regionen
- 2009
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Ingår i: Gefle Dagblad. - Gävle. - 1103-9302. ; 6 februari
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 3. |
- Beckman, Claes, 1962-, et al.
(författare)
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Shared Networks : Making Wireless Communications Affordable
- 2005
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Ingår i: IEEE wireless communications. - : IEEE. - 1536-1284 .- 1558-0687. ; 12:2, s. 78-85
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Tidskriftsartikel (refereegranskat)abstract
- In the wake of the substantial financial commitments incurred by European and other UMTS network operators in the form of licence fees, licensees have turned to network sharing as a means of reducing the capital requirements needed to bring 3G services to market. The reception from European regulators has been mixed, due to concerns that this inhibits competition, slow buildout, or otherwise result in reduced consumer benefits. The authors believe that the generic product life cycle model provides insights that indicate that network sharing, within an appropriately constructed regulatory framework, is not a threat to vigorous competition in the 3G industry, and in fact is one of the keys to stimulating the development of advanced, ubiquitous, affordable services.
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| 4. |
- Beckman, Claes, 1962-, et al.
(författare)
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The Benefits of network Sharing
- 2005
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Ingår i: Radiovetenskap och Kommunikation. ; , s. 147-151
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Konferensbidrag (refereegranskat)
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| 5. |
- Beckman, Claes, 1962-, et al.
(författare)
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The evolution of base station antennas for mobile communications
- 2007
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Ingår i: International Conference on Electromagnetics in Advanced Applications. - : IEEE conference proceedings. - 9781424407675 ; , s. 85-92
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Konferensbidrag (refereegranskat)abstract
- This paper gives a general overview of the design of base station antennas for mobile communications. It explains underlying theoretical and practical implementation aspects in mobile communication networks of today and the future. In the first part the fundamental parameters of a base station antenna are discussed in the context of radio network design. In particular we discuss parameters such as gain, radiation patterns, frequency bands and power handling and put them in the context of cell planning, propagation and capacity. In the final parts of the paper we give an overview of the underlying theory of diversity and MIMO systems.
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| 6. |
- Beckman, Claes, 1962-, et al.
(författare)
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Verifying 3G licence requirements when every dB is worth a billion
- 2006
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Ingår i: First European Conference on Antennas & Propagation. - 9789290929376 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- In the year 2000, the Swedish Telecom regulator: “Post&Telestyrelsen”, PTS, granted in a “beauty contest” four licenses for operations of 3G systems. To verify the coverage and the license requirements, PTS, has developed a test procedure where the field strength of the primary Common Pilot Channel, CPICH, is measured in a drive test. Designing such a test constitutes a number of challenges mainly due to the fact that in 3G the accuracy in the measurement needs to be extremely high since even a small systematic error of ~1dB could in Sweden have the consequence that each operator would have to build an extra +1000 sites at a staggering cost of ~1billion SEK!The present paper gives an overview of the considerations behind the design of the test method used for verification of the 3G licence requirements in Sweden.
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| 7. |
- Beckman, Claes, 1962-, et al.
(författare)
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Verifying 3G License Requirements : some Preliminary Swedish Results
- 2008
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Ingår i: The 68th IEEE Vehicular Technology Conference. - : IEEE. - 9781424417216 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- In the year 2000, the Swedish Telecom regulator “Post&Telestyrelsen” (PTS) granted in a “beauty contest” four licenses for operation of 3G mobile networks. Through this process, the licensees committed themselves to cover 8.860.000 inhabitants of the Swedish population. In order to verify the coverage and confirm compliance with the license requirements, PTS, developed a test procedure in close collaboration with the licensees. The present paper gives an overview of the considerations behind the design of the test method and presents some preliminary results. Today all Swedish 3G operators comply with the licence requirement and it is concluded that a method for verifying the requirement accepted by the licensees is an important tool for successful licensing of spectrum and fulfilment of licensing obligations.
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| 8. |
- Halim, Humam, et al.
(författare)
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Evaluation of a Near Field Scanner for TRP and Radiation Pattern Measurements of GSM Mobile Phones
- 2009
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Ingår i: 3rd European Conference on Antennas and Propagation, 2009. EuCAP 2009.. - Berlin : EUCAP2009. - 9781424447534 - 9783000245732 ; , s. 2207-2211
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper a new tool for estimation of the radio performance of terminal antennas in terms of Total Radiated Power, TRP is tested and evaluated. The tool is known as Lab Express and is developed by the Canadian company EMSCAN. The results from measurements performed with the Lab Express are compared with of the radiation patterns and total radiated power (TRP) estimates, measured with a CTIA approved Satimo SG24 chamber. The TRP and radiation pattern measurements are performed on 10 commercially available mobile phones at GSM 900 and GSM 1800 frequency bands. The dependency of the measured TRP on the positioning of the mobile phone on EMSCAN is also tested. Our results indicate that the TRP measured with Lab Express is well correlated with the results obtained from the Satimo SG24 chamber even though the Lab Express equipment seem to over estimate the TRP with on average about 4dB at 900MHz and about 1.3dB at 1800MHz.
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| 9. |
- Krishna, Pothula Hari, et al.
(författare)
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Multi-band PIFA for combined 3G and DVB-H Terminals : a preliminary study
- 2007
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Ingår i: 2007 IEEE International Workshop on Antenna Technology. - Piscataway, NJ : IEEE. - 1424410878 ; , s. 439-442
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Konferensbidrag (refereegranskat)abstract
- Based on the work by Ciais et. al, a small, efficient and low profile Planar Inverted-F antenna with multi-band operations for the use in mobile telephones has been studied. The antenna was designed using a High Frequency Structure Simulator, HFSS, built and verified. In order to increase the bandwidth of the antenna from the original design it is further optimized by frequency tuning using the shorts of different parasitic element. The resulting antenna operates over two wide bands from (710-1200) MHz and from (1750-2170) MHz, covering five cellular bands and the upper part of the UHF-band allowing it to be used in terminals combining cellular and DVB-H operations.
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| 10. |
- Prasad, Sathyaveer, 1978-, et al.
(författare)
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Estimation of the Rician K-factor in Reverberation Chambers for Improved Repeatability in Terminal Antenna Measurements
- 2008
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Ingår i: 30th Annual Symposium of the Antenna Measurement Techniques Association (AMTA). - Boston, Mass. : AMTA.
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Konferensbidrag (refereegranskat)abstract
- The in-network performance of the mobile phone depends highly on the terminal antennas. Their performance may reduce the coverage and the capacity of the whole network. Hence, an antenna measurement method that accurately emulates the in-network radio environment is much desired. The reverberation, or mode-stirred, chamber is a cavity resonator with a high Q factor used for testing the performance of terminals and terminal antennas in a controlled field environment. In order to create a homogeneous field inside the chamber, emulating an isotropic multipath environment, mode stirrers are used. The Rician K-factor is a statistical parameter that describes the field distribution in the chamber and is defined as the ratio of the unstirred to stirred field components in the chamber. This K-factor varies from zero to infinity. In order to be able to accurately repeat a measurement performed in a reverberation chamber it is, hence, of greatest importance to accurately determine the Rician K-factor from said measurements. In this paper, a statistical model for the electromagnetic fields in reverberation chamber is reviewed for a Line of Sight (LOS) environment. An Estimator of the Rician K-factor is derived and its accuracy is verified.
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