Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370146
Jianwu Zhang, Wen Sun, Chengzhong Xu
Recent advances of DSP, microprocessor (MPU), micro-electronics and the antenna in miniature, makes it possible to employ smart antennas (SA) in a mobile station (MS) in next generation mobile communications (3G). Because the processing capacity of MS is relatively weak, to guarantee the smart antenna performance, its algorithm complexity of the smart antenna is very important. In the paper, we propose a low complex algorithm using the auxiliary pilot signals to estimate the channel parameter in the downlink. Via simulation, we evaluate the performance of SA with two elements in terms of the bit error rate (BER). The simulation results show that using SA can improve the performance of the MS significantly.
{"title":"Performance Evaluation of Low Complex Smart Antennas in a Mobile Station for the Downlink of 3G","authors":"Jianwu Zhang, Wen Sun, Chengzhong Xu","doi":"10.1109/IWAT.2007.370146","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370146","url":null,"abstract":"Recent advances of DSP, microprocessor (MPU), micro-electronics and the antenna in miniature, makes it possible to employ smart antennas (SA) in a mobile station (MS) in next generation mobile communications (3G). Because the processing capacity of MS is relatively weak, to guarantee the smart antenna performance, its algorithm complexity of the smart antenna is very important. In the paper, we propose a low complex algorithm using the auxiliary pilot signals to estimate the channel parameter in the downlink. Via simulation, we evaluate the performance of SA with two elements in terms of the bit error rate (BER). The simulation results show that using SA can improve the performance of the MS significantly.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130096431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370181
Bing Wu, Xianwei Xie
The downlink joint transmission (JT) scheme utilizing the reciprocity of the time division duplex (TDD) channel has been proposed, in which the transmit signals to all mobile station (MS) are jointly generated under the consideration of the channel properties estimated from the uplinks. The scheme can observably reduce the computation and the complexity of mobile station, such that only a linear filter is required in MS to detect the received signals. JT was extended to multi-user MIMO, i.e. MMO JT. It was assumed in all previous works that antennas both at BS and MS are uncorrelated, which is not the case in a real-life system. This paper focus on MIMO JT with correlated antennas both at BS and MS, but antenna pairs on BS and MS respectively are uncorrelated. The digital results for MIMO JT with correlated antennas was presented and compared to the performance of MIMO JT with uncorrelated antennas.
{"title":"MIMO Joint Transmission Technology with Correlated Antenna Elements","authors":"Bing Wu, Xianwei Xie","doi":"10.1109/IWAT.2007.370181","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370181","url":null,"abstract":"The downlink joint transmission (JT) scheme utilizing the reciprocity of the time division duplex (TDD) channel has been proposed, in which the transmit signals to all mobile station (MS) are jointly generated under the consideration of the channel properties estimated from the uplinks. The scheme can observably reduce the computation and the complexity of mobile station, such that only a linear filter is required in MS to detect the received signals. JT was extended to multi-user MIMO, i.e. MMO JT. It was assumed in all previous works that antennas both at BS and MS are uncorrelated, which is not the case in a real-life system. This paper focus on MIMO JT with correlated antennas both at BS and MS, but antenna pairs on BS and MS respectively are uncorrelated. The digital results for MIMO JT with correlated antennas was presented and compared to the performance of MIMO JT with uncorrelated antennas.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124988246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370137
W. Liu, R. Wu, R. Langley
A beamspace adaptive planar array for broadband beamforming based on the frequency invariant beamforming technique is proposed. The relationship between the dimension of the two-dimensional (2-D) prototype filter for the beam design and the number of independent beams is discussed and an arrangement of the desired frequency invariant responses for beamspace processing is provided, which guarantees the linear independence of the beams. Simulation results show the effectiveness of the method with increased convergence speed and a resultant frequency invariant beam pattern
{"title":"Beamspace Adaptive Beamforming for Broadband Planar Arrays","authors":"W. Liu, R. Wu, R. Langley","doi":"10.1109/IWAT.2007.370137","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370137","url":null,"abstract":"A beamspace adaptive planar array for broadband beamforming based on the frequency invariant beamforming technique is proposed. The relationship between the dimension of the two-dimensional (2-D) prototype filter for the beam design and the number of independent beams is discussed and an arrangement of the desired frequency invariant responses for beamspace processing is provided, which guarantees the linear independence of the beams. Simulation results show the effectiveness of the method with increased convergence speed and a resultant frequency invariant beam pattern","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132025814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370136
E. Sáenz, P. Ikonen, R. Gonzalo, I. Ederra, P. de Maagt, S. Tretyakov
A new planar superstrate, proposed for the gain enhancement of dipole antennas, is modelled and analyzed. The superstrate consists of two closely located parallel grids of short dipoles and one grid of continuous wires in between the dipole grids. Also the situation when the wire grid is absent is studied. An analytical model based on the local field approach has been derived in order to extract the transmission and reflection responses of the superstrates. The responses have been compared with the results predicted by Ansoft-HFSS. A finite size superstrate has been designed for a dipole antenna, and the simulations show that a significant gain enhancement can be achieved with the proposed design
{"title":"Modelling and Analysis of Composite Antenna Superstrates Based on Grids of Dipoles and Wires","authors":"E. Sáenz, P. Ikonen, R. Gonzalo, I. Ederra, P. de Maagt, S. Tretyakov","doi":"10.1109/IWAT.2007.370136","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370136","url":null,"abstract":"A new planar superstrate, proposed for the gain enhancement of dipole antennas, is modelled and analyzed. The superstrate consists of two closely located parallel grids of short dipoles and one grid of continuous wires in between the dipole grids. Also the situation when the wire grid is absent is studied. An analytical model based on the local field approach has been derived in order to extract the transmission and reflection responses of the superstrates. The responses have been compared with the results predicted by Ansoft-HFSS. A finite size superstrate has been designed for a dipole antenna, and the simulations show that a significant gain enhancement can be achieved with the proposed design","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132907198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370188
M.-A. Setta, C. Parini
In this paper, aspects of modelling millimetre-wave arrays with the FD-TD will be presented. Mutual coupling results obtained with the in-house FD-TD code are also included.
{"title":"Investigating the mutual coupling between mm-wave slot-ring antennas using the FD-TD method","authors":"M.-A. Setta, C. Parini","doi":"10.1109/IWAT.2007.370188","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370188","url":null,"abstract":"In this paper, aspects of modelling millimetre-wave arrays with the FD-TD will be presented. Mutual coupling results obtained with the in-house FD-TD code are also included.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114973123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370175
Shaopeng Feng, Jingyang Lv, Yanwen Wang, P. Gong, Weilin Wu
In this paper, we present an iterative algorithm of channel estimation for MIMO-OFDM systems based on discrete cosine transform (DCT). By exploiting the properties of DCT, the proposed method mitigates the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method. Further more, the proposed algorithm reduces the additive white Gaussian noise (AWGN) and inter-carrier interference (ICl) significantly by iteration. Simulation results show that the proposed method provides good MSE performance.
{"title":"An Iterative Algorithm of Channel Estimation for MIMO-OFDM Systems Based on Discrete Cosine Transform","authors":"Shaopeng Feng, Jingyang Lv, Yanwen Wang, P. Gong, Weilin Wu","doi":"10.1109/IWAT.2007.370175","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370175","url":null,"abstract":"In this paper, we present an iterative algorithm of channel estimation for MIMO-OFDM systems based on discrete cosine transform (DCT). By exploiting the properties of DCT, the proposed method mitigates the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method. Further more, the proposed algorithm reduces the additive white Gaussian noise (AWGN) and inter-carrier interference (ICl) significantly by iteration. Simulation results show that the proposed method provides good MSE performance.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116742166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370184
A. Rahman, Y. Hao
This paper proposes a novel miniaturized CPW-fed antenna for ultra-wideband applications. This antenna employs two oblique tapered slots as opposed to conventional CPW-fed antenna. The antenna shows good group delay and return loss characteristics as it prevents strong resonance and large group delay variation throughout the band. Radiation pattern looks quasi-omnidirectional with the maximum gain limited to around 4 dBi. On/off body impulse response also looks satisfactory.
{"title":"A novel tapered slot CPW-fed antenna for ultra-wideband applications and its on/off-body performance","authors":"A. Rahman, Y. Hao","doi":"10.1109/IWAT.2007.370184","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370184","url":null,"abstract":"This paper proposes a novel miniaturized CPW-fed antenna for ultra-wideband applications. This antenna employs two oblique tapered slots as opposed to conventional CPW-fed antenna. The antenna shows good group delay and return loss characteristics as it prevents strong resonance and large group delay variation throughout the band. Radiation pattern looks quasi-omnidirectional with the maximum gain limited to around 4 dBi. On/off body impulse response also looks satisfactory.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121666009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370143
D. Tsamakis, Z. Wu
This paper presents the study of the effect of dielectric loading on the performance of printed monopoles. An initial antenna structure is presented and the alterations in its resonant frequency and impedance bandwidth with varying parameters of the ceramic brick, forming the load of the design, are investigated. Comparison with the results for different structures is also illustrated. General rules on the effect of each load characteristic are drawn from the study.
{"title":"The Effect of Dielectric Loading on Printed Monopoles","authors":"D. Tsamakis, Z. Wu","doi":"10.1109/IWAT.2007.370143","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370143","url":null,"abstract":"This paper presents the study of the effect of dielectric loading on the performance of printed monopoles. An initial antenna structure is presented and the alterations in its resonant frequency and impedance bandwidth with varying parameters of the ceramic brick, forming the load of the design, are investigated. Comparison with the results for different structures is also illustrated. General rules on the effect of each load characteristic are drawn from the study.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123969451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370097
Jiawen Sun, Zhenghe Feng
The design of an antenna, consisting of two strip monopoles printed on the same side of an electronically thin dielectric substrate and using 50 Omega microstrip feed line, is presented. The proposed antenna can provide two separate impedance bandwidth of 450 MHz (about 17.5% centered at 2.575 GHz) and 1 GHz (about 18.5% centered at 5.4 GHz) with return loss S11 below -10 dB. It easily covers the required bandwidths for wireless local area network (WLAN). The dual-band antenna is simple in design, and the lengths of the antenna's larger and smaller strips can easily control the lower and higher resonant frequencies, respectively. The widths of the radiation elements are changed to get better impedance matching. Details of the proposed antenna design and results are presented and discussed.
{"title":"A Novel Compact Dual-band Printed Monopole Antenna","authors":"Jiawen Sun, Zhenghe Feng","doi":"10.1109/IWAT.2007.370097","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370097","url":null,"abstract":"The design of an antenna, consisting of two strip monopoles printed on the same side of an electronically thin dielectric substrate and using 50 Omega microstrip feed line, is presented. The proposed antenna can provide two separate impedance bandwidth of 450 MHz (about 17.5% centered at 2.575 GHz) and 1 GHz (about 18.5% centered at 5.4 GHz) with return loss S11 below -10 dB. It easily covers the required bandwidths for wireless local area network (WLAN). The dual-band antenna is simple in design, and the lengths of the antenna's larger and smaller strips can easily control the lower and higher resonant frequencies, respectively. The widths of the radiation elements are changed to get better impedance matching. Details of the proposed antenna design and results are presented and discussed.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122622776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370105
J. Guterman, Yahya Rahmat-Samii, Antonio A. Moreira, Cust6dio Peixeiro
The omnidirectionality of a laptop internal antenna can be severely affected by the laptop electrically large structure. Therefore, an accurate evaluation of the radiation pattern requires a proper modelling of the laptop housing effects. Due to the large laptop dimensions, this antenna-PC integrated approach leads to a minimum far field distance of at least 12 meters at the WLAN frequency bands. Such a large distance is not easily accommodated in indoor far-field measurement ranges. A near field measurement technique seems appropriate to solve the problem. This study reports 2.4/5.2 GHz laptop internal antenna housing effects on the far field radiation pattern. The full wave simulations are compared with measurement results obtained in UCLA near field spherical range. A very good agreement obtained for all the investigated scenarios confirms that the near field technique is adequate to deal with this type of measurement problems.
{"title":"Radiation Pattern of a 2.4/ 5.2GHz Laptop Internal Antenna: Near Field Spherical Range Measurements and Full Wave Analysis","authors":"J. Guterman, Yahya Rahmat-Samii, Antonio A. Moreira, Cust6dio Peixeiro","doi":"10.1109/IWAT.2007.370105","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370105","url":null,"abstract":"The omnidirectionality of a laptop internal antenna can be severely affected by the laptop electrically large structure. Therefore, an accurate evaluation of the radiation pattern requires a proper modelling of the laptop housing effects. Due to the large laptop dimensions, this antenna-PC integrated approach leads to a minimum far field distance of at least 12 meters at the WLAN frequency bands. Such a large distance is not easily accommodated in indoor far-field measurement ranges. A near field measurement technique seems appropriate to solve the problem. This study reports 2.4/5.2 GHz laptop internal antenna housing effects on the far field radiation pattern. The full wave simulations are compared with measurement results obtained in UCLA near field spherical range. A very good agreement obtained for all the investigated scenarios confirms that the near field technique is adequate to deal with this type of measurement problems.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129818554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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