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IEE Colloquium on Capacity and Range Enhancement Techniques for the Third Generation Mobile Communications and Beyond (Ref. No. 2000/003)

2000

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  • Adaptive cell sizing in cellular networks

    Publication Year: 2000, Page(s):4/1 - 4/5
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    This paper investigates the potential capacity improvements made possible through the use of dynamic cell sizing in a cellular network. The purpose of dynamic cell sizing is to reduce cell radii and thus enable in-cell users to increase their transmit powers. The use of higher transmit powers suppresses intercell interference and leads to an overall increase in capacity. This paper discusses the d... View full abstract»

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  • Planning and optimisation of smart antenna base stations in 3G networks

    Publication Year: 2000, Page(s):1/1 - 1/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    In the initial UMTS infrastructure deployment, sector antenna-equipped base sites will predominate. It is likely that the first switched-beam antenna products will be available in 2001/2, when build out is underway. Operators may choose to replace sector antennas for switched beam units on some sites where traffic demand is expected to be very high. The `smart sectorisation' of a site's coverage a... View full abstract»

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  • Intelligent relaying for future personal communication systems

    Publication Year: 2000, Page(s):9/1 - 9/5
    Cited by:  Papers (20)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    This paper highlights the key benefits of using intelligent relaying (IR) for future personal communication systems. IR is a technique that incorporates direct mobile to mobile communication, allowing end-to-end connectivity in a network to be implemented via a number of short hops. A mobile can in theory reach any destination by transmitting only as far as its closest neighbour, bringing potentia... View full abstract»

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  • Space-time coding in the third generation and beyond

    Publication Year: 2000, Page(s):7/1 - 7/8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    We consider space-time coding and other techniques which have been developed to take advantage of the substantial capacity increases which are available in multi-antenna, or MIMO (multiple-in, multiple-out) radio channels. We address the question of how and to what extent these techniques may be exploited in third generation mobile systems based on standards such as UMTS. We consider both the depe... View full abstract»

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  • Considerations for UMTS capacity and range estimation

    Publication Year: 2000, Page(s):5/1 - 5/6
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    In this paper, example uplink and downlink capacity and range estimation methods have been outlined. These have been limited to the single service case where the modem performance, multipath structure, environmental conditions and service rate are common to all users in the network. It has been found that uplink capacity estimation is primarily a function of modem performance and the F-factor. Thi... View full abstract»

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  • Fast linear multi-user detector for DS-CDMA systems

    Publication Year: 2000, Page(s):10/1 - 10/4
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    This paper reviews the family of linear multi-user detectors and compares them in terms of complexity and performance. The complexity of such detectors due to matrix inversion operation is also discussed. An approximate method for computing the inverse of correlation matrix based on series expansion is presented. This method is less complex and easy to implement. The problem is examined and a new ... View full abstract»

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  • Space-time estimation techniques for UTRA system

    Publication Year: 2000, Page(s):6/1 - 6/7
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    This paper investigates the space-time channel estimation techniques in a multiple-access communication receiver system that receives coded digital data modulated using DS-CDMA, with an antenna array in a multipath propagation environment. A spatial and temporal channel model has been implemented, which is built upon the understanding of multipath fading and Doppler spread with merging time delay ... View full abstract»

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  • Space-time coding for capacity enhancement in future-generation wireless communications networks

    Publication Year: 2000, Page(s):8/1 - 811
    Cited by:  Papers (2)  |  Patents (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (680 KB)

    We present a simple yet novel space-time coding (STC) approach, based on a logical extension of simple convolutional codes. We compare this STC scheme with known transmission techniques, including space-time transmit diversity (STTD) and BLAST, in terms of code construction and performance. We present simulation results of actual performance, and discuss the reasons for, and implications of, the p... View full abstract»

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  • DOA estimation using a relaxation based method

    Publication Year: 2000, Page(s):2/1 - 2/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    A modified relaxation based method is employed to minimise the maximum likelihood function in the estimation of the DOA of signals impinging on an antenna array. The method is suitable for estimating DOAs of coherent signals and in the case where the number of snapshots is limited. Simulation results are used to demonstrate the performance of the relaxation-based method relative to that of other m... View full abstract»

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  • SFDMA-spatial focus division multiple access

    Publication Year: 2000, Page(s):3/1 - 3/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    The concept of spatial focus division multiple access (SFDMA) is presented. SFDMA intends to increase capacity by exploiting diversity as well as reducing interference. Adaptive antennas are employed to focus the power of more than one base station simultaneously towards the mobile station's position. Signals focused towards the mobile station are divided by code division multiple access. The avai... View full abstract»

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