IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications,

2-5 Sept. 2002

Go

Filter Results

Displaying Results 1 - 25 of 40
  • 2002 IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications [front matter]

    Publication Year: 2002, Page(s):I - XIX
    Request permission for commercial reuse | PDF file iconPDF (635 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 2002, Page(s):XX - XXIII
    Request permission for commercial reuse | PDF file iconPDF (128 KB)
    Freely Available from IEEE
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis and application of power control in cdma2000

    Publication Year: 2002, Page(s):772 - 776 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB) | HTML iconHTML

    We study the effect of power control (PC) in cdma2000, an evolution of the TIA/EIA-95 cellular standard. We describe the mechanisms for PC in cdma2000 and develop a simplified analytical model. Analysis of this model shows the regime where PC offers benefits and facilitates an intuitive understanding of reverse link simulations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of EM-based multiuser detection for space-time block coded WCDMA systems over multipath fading channels

    Publication Year: 2002, Page(s):707 - 711 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB) | HTML iconHTML

    We present a multiuser detection (MUD) scheme derived from the expectation maximization (EM) algorithm for the downlink of space-time block coded (STBC) WCDMA systems. We consider the downlink scenario with two transmit antennas and a single receive antenna and multipath fading channels. The EM-based MUD looks iteratively for the maximum-likelihood solution. Its structure is very similar to the pa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Uplink transmission control for asymmetric communications in CDMA/shared-TDD cellular packet communications

    Publication Year: 2002, Page(s):662 - 666 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB)

    The shared-TDD scheme has been proposed for accommodation of asymmetric communications between uplinks and downlinks. The application of the shared-TDD scheme to cellular systems causes inter-link interference. This paper proposes uplink transmission control in order to relieve the effect of inter-link interference in CDMA/shared-TDD cellular packet systems. In the proposed scheme, the mobile stat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power control in CDMA interference-shared return-links subject to large delays

    Publication Year: 2002, Page(s):766 - 771 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (422 KB) | HTML iconHTML

    The use of power control for interference-shared CDMA links is well understood. But performance suffers when those links have large delays. We analyze that performance and show how the poor performance can be ameliorated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A heuristic approach for path provisioning in Diff-Serv networks

    Publication Year: 2002, Page(s):692 - 696 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (386 KB) | HTML iconHTML

    To achieve QoS guarantees for predicted traffic with N quality levels in differentiated services (Diff-Serv) networks with M interior routers, an efficient heuristic algorithm for end-to-end congestion control is being developed. It can be applied as an effective tool for traffic engineering (TE) in MPLS-based networks or it can be used for network dimensioning in optimal sizing of transmission tr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance evaluation of quantum based multi-user detector

    Publication Year: 2002, Page(s):722 - 725 vol.3
    Cited by:  Papers (3)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Mutual interference of IMT-2000 networks

    Publication Year: 2002, Page(s):657 - 661 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB) | HTML iconHTML

    We consider the adjacent channel interference of IMT-2000 networks. The results are shown for the UTRA-FDD mode of the IMT-2000 standard but can be applied to any other mode. The interference is described by an analytical model which includes all interference sources in a cluster of 7 cells. This interference calculation is used to describe the capacity loss caused by neighboring IMT-2000 network ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A simple iterative power control scheme for successive interference cancellation

    Publication Year: 2002, Page(s):761 - 765 vol.3
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    Successive interference cancellation (SIC) is a technique which has the potential to increase the capacity of DS-CDMA systems substantially. One of the major criticisms of the technique is that it requires a specific distribution of unequal received powers from the mobile units. In the presence of estimation error, the required distribution becomes even more complicated and it is critical that the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An improved sequential decoding algorithm in TD-CDMA system

    Publication Year: 2002, Page(s):717 - 721 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (349 KB) | HTML iconHTML

    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.