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IEE Proceedings - Communications

Issue 3 • Date Jun 2002

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Displaying Results 1 - 10 of 10
  • More realistic analysis for blocking probability in SDMA systems

    Publication Year: 2002, Page(s):152 - 156
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (538 KB)

    The proliferating demands for mobile services propel the development of increasingly sophisticated techniques to overcome wireless radio resource limitations. With the introduction of cell splitting and sectorisation in cellular communications systems, system capacity can be significantly increased. Space division multiple access (SDMA) technology along these lines has therefore gained a great dea... View full abstract»

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  • Decorrelating detector for asynchronous CDMA channels with adaptive path selection

    Publication Year: 2002, Page(s):167 - 170
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (469 KB)

    The conventional multipath-decorrelating receiver performance depends on the number of resolvable paths. The conventional multipath-decorrelating receiver uses as many branches as the number of resolvable paths of the channel to improve the performance of the system. However, using all of the resolvable paths of the channel in the receiver increases the system complexity and the decorrelating filt... View full abstract»

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  • New frame-based network allocation vector for 802.11b multirate wireless LANs

    Publication Year: 2002, Page(s):147 - 151
    Cited by:  Papers (3)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (644 KB)

    To enhance the system capacity of the IEEE 802.11 wireless local area networks (WLANs), a frame-based adaptive multirate transmission scheme is envisaged. The medium access control (MAC) operation and the selection of parameters, such as the thresholds of request to send (RTS) and fragmentation, are discussed. The original virtual carrier sense mechanism in the IEEE 802.11 WLAN standard is no long... View full abstract»

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  • Puncturing effects on turbo codes

    Publication Year: 2002, Page(s):132 - 138
    Cited by:  Papers (26)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (681 KB)

    The authors address various important issues related to punctured turbo codes. A modified technique for finding the transfer function of punctured turbo codes is developed. This modified technique provides a means of deterministic evaluation of the weight distribution of the code, as well as a possibility of studying various puncturing patterns. These advantages are shown with some illustrative ex... View full abstract»

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  • Blind adaptive receiver for coded multicarrier DS-CDMA systems in multipath fading channels

    Publication Year: 2002, Page(s):171 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (873 KB)

    The authors present a multicarrier asynchronous direct sequence code division multiple access (DS-CDMA) system which uses an adaptive blind algorithm for the optimum combining of the desired signal contributions from different carriers. The output of the transmitter convolutional encoder modulates multiple band-limited DS-CDMA waveforms which are parallel transmitted with different carrier frequen... View full abstract»

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  • Accurate error rate estimate using moment method for optimum diversity combining and MMSE equalisation in digital cellular mobile radio

    Publication Year: 2002, Page(s):157 - 165
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (915 KB)

    Research is presented which provides fast and accurate performance analysis for optimum diversity combining and equalisation with quadrature amplitude modulation (QAM) over mobile radio channels with frequency-selective fading. The performance of optimum diversity combining and equalisation over a noise-limited channel has been presented previously, but the error rate calculation was based on the ... View full abstract»

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  • Integrated model for performance analysis of multiple class-of-service Internet

    Publication Year: 2002, Page(s):139 - 146
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (888 KB)

    A framework is developed for performance analysis of an integrated model of multiple class-of-service Internet. An Internet service provider is considered who provides premium, assured and best-effort services to end-users. Various aspects of the model are studied including link bandwidth allocation/sharing policies, user behaviour and service price-quality structure design. An analytic Markov mod... View full abstract»

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  • Two-error-location for quadratic residue codes

    Publication Year: 2002, Page(s):129 - 131
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (410 KB)

    A formula is found in terms of the syndromes for finding the locations of two errors in a received word of an e error-correcting quadratic residue code with e ⩾ 2. This formula is independent of the characteristic of the underlying field. All quadratic residues codes for which the formula is applicable are described View full abstract»

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  • Allocating wavelength converters in shared-per-link structure in WDM networks

    Publication Year: 2002, Page(s):185 - 188
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    The authors discuss the optimal allocation of wavelength converters in shared-per-link structure in WDM networks. In particular, they consider the following two cases: given the total number of converters available in the system, or given the number of converters available at each node in the system, allocate them properly at the outgoing links of the nodes, such that the total sum of traffic of c... View full abstract»

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  • DC offset and IM2 removal in direct conversion receivers

    Publication Year: 2002, Page(s):179 - 184
    Cited by:  Papers (34)  |  Patents (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (659 KB)

    DC offsets cause interference in homodyne receivers, caused by nonlinearity and imbalances in the receiving amplifier and mixing circuits, as well as local oscillator (LO) leakage into the RF input port and RF leakage into the LO port. The latter causes a squaring action (hence, second order intermodulation distortion (IM2)) in the mixer which generates a DC offset (low frequency) that varies with... View full abstract»

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