IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)

8-12 Nov. 1998

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  • IEEE Globecom 1998 [front matter]

    Publication Year: 1998, Page(s):i - xii
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  • An emulator for testing the performance of framed access schemes

    Publication Year: 1998, Page(s):3777 - 3782
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  • Author index

    Publication Year: 1998, Page(s):xiii - xxi
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  • Hidden Markov models for burst errors in GSM and DECT channels

    Publication Year: 1998, Page(s):3692 - 3698 vol.6
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Digital communication systems operating over fading radio channels suffer burst errors which can be modeled by a hidden Markov process model. An approach is presented for constructing HMM models for GSM and DECT channels using waveform level simulation and the resulting set of HMM models are tabulated for realistic values of the fading channel parameters. The use of the HMM model for protocol desi... View full abstract»

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  • Throughput analysis and design of fixed and adaptive ARQ/diversity systems for slow fading channels

    Publication Year: 1998, Page(s):3686 - 3691 vol.6
    Cited by:  Papers (3)  |  Patents (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    We study the performance of a fixed diversity (FD) ARQ system in which no error correction coding is used, and only second order transmitter diversity is used. In the system two spatially separated antennas are used to transmit the same information signal in a staggered fashion. In an FD system with two transmitting antennas, due to the staggered nature of transmission, the information rate of the... View full abstract»

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  • Emergency communication services: demand, development and system implementation in China

    Publication Year: 1998, Page(s):3176 - 3180 vol.6
    Cited by:  Papers (2)
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    The demands for emergency communication services have grown very fast in the past few years. The history and characteristics of emergency communication techniques are reviewed. By concentrating on public security applications, several emergency communication systems have been successfully developed based upon the concept and architecture of the intelligent network. The implementation and functions... View full abstract»

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  • Analytical approach for multipath delay spread power distribution

    Publication Year: 1998, Page(s):3680 - 3685 vol.6
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    There is a certain relationship between the delay spread and the received signal strength of multipath waves. This paper describes the geometrical interpretation for spread delay in urban areas. An analytical approach for relative received power as a function of excess delay is discussed. Examples of measured data for power delay profiles are used in comparison with the analytical results. These e... View full abstract»

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  • Maximal-ratio-combining array beamforming assisted by training sequences for SDMA mobile radios

    Publication Year: 1998, Page(s):3204 - 3208 vol.6
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    This paper proposes and discusses the study of a non-blind type digital beamformer that can be applied to receiving array antennas with many elements. It can steer different beams independently to different users at the same frequency and of the same modulation type located in different unknown directions. The proposed beamformer is comprised of the combination of a spatial discrete Fourier transf... View full abstract»

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  • Communication infrastructure-Indian scenario

    Publication Year: 1998, Page(s):3171 - 3175 vol.6
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    The paper portrays India's journey down the technological highway in the field of telecommunications. The country recognises the importance of telecommunication infrastructure for its socio-economic development. Through policy statements and liberalization the country is trying to provide international grade connectivity and value-added services to its vast populace. Its educational institutions a... View full abstract»

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  • Direct-detection optical asynchronous CDMA systems with double optical hard-limiters: APD noise and thermal noise

    Publication Year: 1998, Page(s):3233 - 3238 vol.6
    Cited by:  Papers (17)
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    Performance of optical asynchronous code-division multiple-access (CDMA) systems with double optical hard-limiters is analyzed in the presence of avalanche photodiode (APD) noise and thermal noise. The following effects on the optimal thresholds of double optical hard-limiters and on-off keying (OOK) decoder are clarified: sequence codes, the number of users, the received laser power, and the modu... View full abstract»

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  • Downlink signal to interference ratio calculation for PACS-UB systems

    Publication Year: 1998, Page(s):3675 - 3679 vol.6
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    The Personal Access Communications System-Unlicensed B (PACS-UB) is a standard intended to operate in the (1920-1930 MHz) band allocated for Unlicensed Personal Communication Services (UPCS) in the US. The access of portables in PACS-UB is carried out based on measurements. This paper presents the analytical derivation of the downlink signal to interference ratio (SIR) probability density function... View full abstract»

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  • Open-loop receiver for MSK with Doppler frequency shift

    Publication Year: 1998, Page(s):3626 - 3631 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    An open-loop digital receiver performing simultaneous carrier phase/frequency estimation and block (two-bit) detection is proposed for MSK signaling in Gaussian channels affected by Doppler frequency shift. Phase estimation and symbol detection are provided by a parallel bank of matched estimators (each one comprising a phase rotation block and a stochastic nonlinear filter) and by a decision algo... View full abstract»

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  • An effective non-linear receiver for high density optical disc

    Publication Year: 1998, Page(s):3374 - 3378 vol.6
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    This paper presents an innovative non-linear receiver (NLR) for the high density optical channel. This receiver is based on the combination of maximum likelihood sequence estimation (MLSE) and nonlinear intersymbol interference (ISI) cancellation. For the non-linear channel description a suitable model based on the Volterra series has been adopted. Simulation results show that the proposed NLR per... View full abstract»

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  • Modeling correlated fading with diversity and its application to block codes performance estimation

    Publication Year: 1998, Page(s):3657 - 3662 vol.6
    Cited by:  Papers (1)
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    The error structure in wireless channels is very crucial to various system designs, but it is also very difficult to describe. In this paper, we first develop a finite state channel model for representing a correlated fading channel with diversity. Specifically, general expressions for determining the steady state probability of each state, transition probabilities between states and error probabi... View full abstract»

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  • Comparison of TDMA versus CDMA for packet transmission schemes in circuit-mode

    Publication Year: 1998, Page(s):3414 - 3419 vol.6
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    We compare the performance of a TDMA multiple access scheme with a CDMA multiple access scheme when both are used for packet transmission in the circuit-mode. First we consider a more general model of slotted Aloha protocol on a channel with capture effect. Both TDMA and CDMA are shown to be special cases of this model. There are M<∞ users each with an infinite buffer. If in a slot, i pac... View full abstract»

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  • First-order Markov modeling for the Rayleigh fading channel

    Publication Year: 1998, Page(s):3669 - 3674 vol.6
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Previous models for the received signal amplitude of the flat-fading channel that use first-order, finite state, Markov chains are examined. The stochastic properties of a proposed first-order model based on these models are examined. The limitations of using an information theoretic metric, which is sometimes used to justify a first-order Markov chain as a sufficient model for very slowly fading ... View full abstract»

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  • RAM-search algorithms for nonlinear ISI cancellation in magnetic recording

    Publication Year: 1998, Page(s):3368 - 3373 vol.6
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    We discuss two algorithms for mitigating the deleterious effects of nonlinear intersymbol interference (ISI) in PR4- and EPR4-equalized magnetic recording channels. We call them RAM-search algorithms as they borrow the idea of employing a RAM (random access memory) from the RAM-DFE, and because they involve a search. The algorithms have been devised to circumvent the error propagation problem that... View full abstract»

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  • Matched codes for ISI channels

    Publication Year: 1998, Page(s):3530 - 3535 vol.6
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    The performance of a bandlimited communication system in the presence of additive white Gaussian noise depends on the minimum Euclidean distance, dmin, between different signal sequences. To further increase dmin, convolutional or trellis, coding could be used. Search results indicate that the encoder with the best free distance does not always give the best coded distance wh... View full abstract»

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  • Synchronization paradigm for protocol testing under multi-party configuration

    Publication Year: 1998, Page(s):3460 - 3466 vol.6
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    Protocol testing leads to the synchronization problem should test sequences be applied to multiple distanced testers, namely under the multi-party configuration. This paper presents a novel synchronization paradigm which seamlessly unifies two synchronization techniques, self-synchronizable sequences and external synchronization operations. To demonstrate the viability of the proposed paradigm, we... View full abstract»

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  • Parallel interference cancellation (PIC) improvements for CDMA multiuser receivers using partial cancellation of MAI estimates

    Publication Year: 1998, Page(s):3282 - 3287 vol.6
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    We study the improvement technique for multistage parallel interference cancellation (PIC) DS-CDMA multiuser receivers, which cancel only a fraction of the estimated multiple access interference (MAI) at each receiver stage. This technique takes into account the fact that the MAI estimate, especially in the earlier stages, contains substantial error, and a relatively conservative strategy of using... View full abstract»

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  • Exploiting binary Markov channels with unknown parameters in turbo decoding

    Publication Year: 1998, Page(s):3244 - 3249 vol.6
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We describe parallel concatenated codes for communication over binary-input, binary-output hidden Markov channels when the parameters of the Markov channel are unknown a priori. Specifically, we develop a joint estimation/decoding method that allows the estimation of the parameters of the model without the need for training sequences. This method involves little or no sacrifice in performance rela... View full abstract»

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  • Intelligent antennas in a scattering environment-an overview

    Publication Year: 1998, Page(s):3199 - 3203 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Communication between two arrays illuminating a random medium is discussed in terms of the correlation between the antenna elements. The high antenna gains achievable for correlated elements are contrasted with the higher spectral efficiencies obtained through creation of parallel channels in the random medium. Transmit-receive diversity and capacity is discussed for the situations where the chann... View full abstract»

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  • S60.6 TMN in the next millennium: automating and delegating management processes

    Publication Year: 1998, Page(s):3165 - 3170 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The deregulation and rapid changes of telecommunication networks present a demanding challenge to network operators: become more competitive by cutting cost and responding faster to their customers' needs. Effective network management is considered to be a key to achieve these goals. This paper shows that effective network management cannot be seen isolated from its environment: integration with t... View full abstract»

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  • Approximate minimum bit-error rate multiuser detection

    Publication Year: 1998, Page(s):3590 - 3595 vol.6
    Cited by:  Papers (19)
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    The minimum mean-squared-error (MMSE) linear multiuser detector is popular because of its good performance and amenability to adaptive implementation. However, there are circumstances in which the linear detector that minimizes the bit-error rate (BER) can significantly outperform the MMSE detector. We propose a low-complexity adaptive algorithm for approximating the minimum BER linear multiuser d... View full abstract»

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  • Reverse link pilot-tones aided synchronization in DS-CDMA communication system

    Publication Year: 1998, Page(s):3408 - 3413 vol.6
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Due to the limitation of conventional communication theory, IS-95 type CDMA cellular systems can only use pilot signals in the forward link to yield coherent detection. In the reverse link non-coherent detection is applied without pilot signals. In this paper, the reverse link pilot-tones aided synchronization which utilizes the aided pilots to facilitate the timing and carrier recovery (with line... View full abstract»

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