IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications,

2-5 Sept. 2002

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  • 2002 IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications [front matter]

    Publication Year: 2002, Page(s):I - XIX
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  • Author index

    Publication Year: 2002, Page(s):XX - XXIII
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  • Determining code symbol LLRs on diversity channels with applications to cdma2000

    Publication Year: 2002, Page(s):807 - 811 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB) | HTML iconHTML

    The reverse link of cdma2000 uses a code-multiplexed pilot signal to allow for near coherent demodulation at the base station receiver. Typical RAKE receivers approximate maximal ratio combining by using a "pilot filter" to derive a combiner weight estimate from the noisy pilot signal. It is possible to improve on this design by exploiting the channel information that is also embedded in the encod... View full abstract»

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  • Mean acquisition time of serial spread spectrum PN acquisition system in the presence of Doppler code

    Publication Year: 2002, Page(s):751 - 755 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (337 KB) | HTML iconHTML

    This contribution evaluates the influence of Doppler code on mean acquisition time of a serial search direct sequence spread spectrum pseudonoise code acquisition system in Gaussian channel. The quadrature correlator with quadratic output is employed. Results of this analysis enable us to set the parameters of this system to optimum values and to minimize the mean acquisition time. View full abstract»

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  • Multipath resolution with PN chip interval

    Publication Year: 2002, Page(s):746 - 750 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    If the delay between two multipaths is about a chip interval and the path strength is almost equal, then the envelope tracking (ENV) scheme of A. Baier et al. (see IEEE JSAC, vol.12, no.4, p.733-43, 1994) performs poorly. This is because only a single peak is observed in the envelope of the correlation function (or multipath power delay profile) and the peak position is about half a chip interval ... View full abstract»

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  • A systematic approach to code phase acquisition in DS-CDMA

    Publication Year: 2002, Page(s):741 - 745 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A new approach to the problem of code phase acquisition is presented. The proposed search strategy is formulated in terms of a single correlator device, and a comparison to the traditional serial search is performed. The new strategy combines two processes. First, there is a sorting part which converges to the most probable delay in a statistical sense. As a second part, a detection process is per... View full abstract»

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  • Introducing delay sensitivity into the proportional fair algorithm for CDMA downlink scheduling

    Publication Year: 2002, Page(s):652 - 656 vol.3
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (377 KB) | HTML iconHTML

    The paper is concerned with CDMA base stations needing forward link scheduling algorithms that not only maximize total throughput given certain constraints regarding fairness, but that also take into account the special delay requirements of real time data. We show that the proportional fair algorithm, which was originally designed to maintain fairness while still exploiting channel variations in ... View full abstract»

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  • Error rate performance bounds in block coded parallel combinatorial SS systems through a uniform interleaver

    Publication Year: 2002, Page(s):736 - 740 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB) | HTML iconHTML

    Upper bounds on the codeword and bit error probabilities are obtained for maximum-likelihood (ML) decoding of block coded parallel combinatorial spread spectrum (PC/SS) systems in additive white Gaussian noise (AWGN) channels. To make the analysis tractable, we put a uniform interleaver between a block encoder and a PC/SS transmitter. An input-output distance enumerating function (IODEF) is introd... View full abstract»

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  • EM-based multiuser detections for optical CDMA networks

    Publication Year: 2002, Page(s):731 - 735 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (371 KB) | HTML iconHTML

    We introduce several EM-based multiuser detectors for an optical CDMA system. The detectors have soft and hard stages. In the soft stage, a soft estimation of the interference is obtained by solving an unconstrained maximum-likelihood (ML) problem via an iterative expectation-maximization (EM) algorithm. Then, the hard stage detects the user information bit by solving a one-dimensional Boolean con... View full abstract»

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  • Transmit diversity for frequency selective channels in UMTS-TDD

    Publication Year: 2002, Page(s):802 - 806 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB) | HTML iconHTML

    Multipath propagation and fading are typical characteristics of wireless communication channels. Simultaneously, they are also the most limiting factors for high speed data rates. The paper investigates the performance of systems using multiple transmit antennas (MISO - multiple input single output) in frequency-selective channels, which combat fading and exploit multipath propagation. The system ... View full abstract»

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  • Turbo equalisation based detectors in wideband synchronous multiuser CDMA networks

    Publication Year: 2002, Page(s):726 - 730 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB) | HTML iconHTML

    Multipoint-to-point CDMA networks have been the primary focus in multiuser interference suppression research, where the recent development of the turbo MMSE detector promises near interference-free performance at an acceptable complexity. The complementary case, namely point-to-multipoint transmission, is increasingly becoming more important since traffic on the forward link is likely to be substa... View full abstract»

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  • Generalized closed loop transmit diversity algorithm for WCDMA

    Publication Year: 2002, Page(s):797 - 801 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (381 KB) | HTML iconHTML

    A previously proposed transmit diversity algorithm for four antennas is extended to an algorithm for eight transmit antennas. Depending on a signal-to-interference-plus-noise ratio maximization criterion, either full (all available transmit antennas) or partial diversity (only a subset or all available transmit antennas) is used. Phase adjustments are also applied between the selected antennas. Th... View full abstract»

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  • Performance evaluation of quantum based multi-user detector

    Publication Year: 2002, Page(s):722 - 725 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB)

    Future wired and wireless communication systems will employ pure or combined code division multiple access (CDMA) techniques, such as in the European 3G mobile UMTS or power line communications system, but also several 4G proposals include, for example, multicarrier (MC) CDMA. Previous investigations discovered the drawbacks of single user detectors (SUD), which are widely employed in narrowband I... View full abstract»

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  • Interference suppression in multiple-input single-output antenna systems for WCDMA downlink transmissions

    Publication Year: 2002, Page(s):792 - 796 vol.3
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    In multiple-input single-output (MISO) antenna systems the multiple access interference and cochannel interference is enhanced by multi-antenna transmission, multiple users and multipath fading channel. The performance of MISO systems can be even worse than single-input single-output antenna systems by using a conventional RAKE receiver especially in heavily-loaded systems with many simultaneous a... View full abstract»

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  • Ultra low current consumption 2.4 GHz DS-SS radio modem

    Publication Year: 2002, Page(s):817 - 821 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB) | HTML iconHTML

    SS radio communication systems in 2.4 GHz ISM band, such as IEEE802.11 and Bluetooth are widely known. These systems can provide very high data rate, over several Mbps. However, on the other hand, they have problems such as high current consumption, short range service area, large size, high design expenditure and development difficulty. From the view point above, to solve these problems, we devel... View full abstract»

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  • Possibilities of the use of SAW technology in future wireless access networks

    Publication Year: 2002, Page(s):832 - 836 vol.3
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    The use of solid state technologies are considered , in particular acousto-electronic (AE) and planar acousto-optic (AO) technologies for the analog pre-processing of spread spectrum signals in multiple wireless access systems. The long term studies show the potential of the proposed approaches to an advanced air-interface architecture based on the solid state electronics to meet the requirements ... View full abstract»

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  • An improved sequential decoding algorithm in TD-CDMA system

    Publication Year: 2002, Page(s):717 - 721 vol.3
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    We considered a sequential decoding algorithm which enables fast decoding and retransmission in TD-CDMA systems. In addition, we propose an improved FANO algorithm, which adopts the competition path in order to reduce the number of revisit nodes. The conventional FANO algorithm suffered from the drawback of much more revisit nodes. Furthermore, we analyze the performance of the TD-CDMA system with... View full abstract»

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  • Rapid iterative multiuser detection for UTRA-TDD in a time-variant multipath environment

    Publication Year: 2002, Page(s):702 - 706 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (415 KB) | HTML iconHTML

    Iterative multiuser detection has gained increasing attention, as a powerful method to mitigate the effects of multiple access interference (MAI) in CDMA systems. The polynomial expansion (PE) multiuser detector discussed in this paper can also be seen as an iterative approach to approximate the MMSE multiuser detector. It is shown that the PE detector can be applied such that it has fast converge... View full abstract»

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  • Using of RAKE receiver architecture for combining GNSS and CDMA cellular wireless location

    Publication Year: 2002, Page(s):787 - 791 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB) | HTML iconHTML

    The location requirements for emergency callers outside urban areas can hardly be fulfilled without Global Navigation Satellite Systems (GNSS). Consequently, interest in positioning techniques based on use of a GNSS such as GPS or on the cellular network infrastructure itself - or a combination of the two methods - is growing rapidly in the mobile telephone community. However, at present no combin... View full abstract»

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  • The impact of propagation time difference in transmit diversity

    Publication Year: 2002, Page(s):812 - 816 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    Transmit diversity has been shown to be an efficient method to improve system performance without the increase of the mobile terminal complexity in wireless communications. The impact of propagation time difference between transmit antennas on the performance of a transmit diversity scheme has been studied under a Rayleigh fading channel. It has been shown that the performance of transmit diversit... View full abstract»

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  • A novel hardware design paradigm for mobile 'software defined radio' terminals

    Publication Year: 2002, Page(s):828 - 831 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (358 KB) | HTML iconHTML

    On the way to mobile software defined radio terminals (SDR terminals), a change of the design philosophy for appropriate microelectronic hardware is necessary. The desired reconfigurability must be provided under the constraints of a low power consumption, a low bill of materials, and a small size. This contribution proposes a novel design paradigm for hardware development, which will help to pave... View full abstract»

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  • FFT-speed and windowed multiuser detector for UTRA-FDD high rate data mode

    Publication Year: 2002, Page(s):712 - 716 vol.3
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    The family of international standards for mobile. communications, IMT-2000, includes, amongst others, the universal terrestrial radio access (UTRA) proposal, which consists of two modes: frequency division duplex (FDD); time division duplex (TDD). A new approach based on the zero-forcing multiuser detector (ZF-MUD) is investigated for the high rate data mode in the UTRA-FDD uplink. This approach i... View full abstract»

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  • Serially concatenated coding for broadcasting S-UMTS applications

    Publication Year: 2002, Page(s):697 - 701 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB) | HTML iconHTML

    Satellite-UMTS supports broadcast applications that involve transmission of the same encoded data over channels that may vary significantly. The same code must allow a user with a good channel to recover the information with low complexity, while a user with a bad channel should still be able to achieve an acceptable BER at the cost of increased complexity and/or decoding delay. To this end, we pr... View full abstract»

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  • Performance analysis of closed loop power control methods in the UTRA-FDD mode

    Publication Year: 2002, Page(s):782 - 786 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB) | HTML iconHTML

    In this paper, closed loop power control procedures in UTRA-FDD are studied. Fast power control is perhaps the most important aspect in a WCDMA system like this. The research has been carried out through a physical layer simulator that has been implemented in the C language from the standard of the UTRA-FDD mode. Different parameters have been taken into account: The research has been made in para... View full abstract»

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  • Combined DSSS/FHSS approach to interference rejection and navigation support in UAV communications and control

    Publication Year: 2002, Page(s):687 - 691 vol.3
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB) | HTML iconHTML

    Unmanned aerial vehicles (UAVs) for a wide variety of applications have enjoyed growing interest. One of the most critical component of a UAV system is the datalink between the UAV itself and the ground control station. This paper provides a comprehensive overview of the requirements for medium-range UAV data links. Special emphasis is given to requirements and solutions which are related to the a... View full abstract»

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