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Communication Systems, 2002. ICCS 2002. The 8th International Conference on

Date 28-28 Nov. 2002

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  • The 8th International Conference on Communication Systems ICCS 2002 [front matter]

    Publication Year: 2002, Page(s):i - xxxviii
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  • Adaptive implementations of two blind channel estimation algorithms on MC-CDMA

    Publication Year: 2002, Page(s):289 - 293 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (313 KB) | HTML iconHTML

    Recently, two non-adaptive algorithms have been proposed for blind channel estimation for multicarrier CDMA. The first one was proposed by Tureli et al. and the second one by Escudero et al. We develop in this paper two adaptive versions for the first algorithm that are based on the gradient. Whereas, for the second one, we propose an adaptive version that is based on a low-cost subspace adaptive ... View full abstract»

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  • Author index

    Publication Year: 2002, Page(s):623 - 629
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  • Detection of signals in correlated interference using a predictive VA

    Publication Year: 2002, Page(s):529 - 533 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (337 KB) | HTML iconHTML

    We address the problem of optimally detecting signals in correlated noise using a predictive Viterbi algorithm (PVA). We derive expressions for the probability of error for uncoded systems employing the PVA, which are corrupted by coloured noise. As an application, the PVA is used in conjunction with a fractionally-spaced linear equalizer (LE-PVA), thereby improving the bit-error-rate performance ... View full abstract»

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  • Performance evaluation of 1024 QAM signal transmission in cable television distribution systems by software demodulation method

    Publication Year: 2002, Page(s):534 - 538 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (345 KB)

    1024 QAM transmission characteristics in cable television distribution system is experimentally evaluated. 52.74 Mbps transmission in a 6 MHz cable television channel is achieved. Spectrum efficiency is 8.79 bit/s/Hz. The transmission performance on a 1024 QAM modem with high amplitude density and large capacity is demonstrated. MPEG-2 TS packets are derived by demodulation software from the IF si... View full abstract»

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  • Dynamic distance-based mobility management for PCS networks: a profile-based approach

    Publication Year: 2002, Page(s):465 - 469 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    The location management scheme currently employed in personal communication networks is static. Dynamic schemes have been proposed in which the update and paging parameters are per-user based. We extend one of the most efficient dynamic schemes, the per-user distance-based scheme, so that the per-user parameters also change with time during the day depending on his observed records. We develop the... View full abstract»

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  • Bit error probabilities of MDPSK over correlated nonselective Rayleigh fading channel with diversity reception

    Publication Year: 2002, Page(s):539 - 543 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    We analyze the bit error probability (BEP) of differential phase shift keying (DPSK) with postdetection maximal ratio combining (MRC) in Rayleigh fading channels. The system accommodates temporal fading correlation in each channel as well as equal fading correlation and noise correlation between different diversity branches. Exact BEP results for 2DPSK and 4DPSK and a very good approximation for 8... View full abstract»

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  • A novel definition of processing gain for the system level simulation in WCDMA

    Publication Year: 2002, Page(s):470 - 474 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB) | HTML iconHTML

    The physical layer structure of WCDMA is different from synchronous CDMA system. Therefore, a novel integration scheme of link and system level simulation is needed. In this paper, we introduce a novel method for estimating required Eb/No of system level data using Ec/Ior of link level data. And we verify the accuracy of modified estimation scheme throug... View full abstract»

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  • A fast ray tracing algorithm for propagation prediction in broadband wireless systems

    Publication Year: 2002, Page(s):6 - 10 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    This paper discuses a fast ray tracing algorithm for propagation prediction in outdoor wireless channels. The algorithm uses a GTD/UTD (geometrical theory of diffraction/uniform theory of diffraction) in combination with a ray tracing technique to model and to simulate the broadband wireless channels. The algorithm uses a modified shooting and bouncing technique to accelerate the ray tracing metho... View full abstract»

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  • Frequency jitter of a digital phase-locked loop and comparison with a modified CRB

    Publication Year: 2002, Page(s):96 - 100 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    The steady state (SS) noise performance of a digital phase locked loop (DPLL) is of very much interest, while tracking carrier signals. In the literature the SS performance is very well examined in terms of the SS phase jitter, however the SS frequency jitter of a DPLL is unexamined up to now. In this paper we analyse the SS performance of a DPLL in terms of the frequency jitter. We derive a linea... View full abstract»

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  • Adaptive Reed Solomon code allocation for wireless LAN

    Publication Year: 2002, Page(s):309 - 312 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB) | HTML iconHTML

    OFDM is considered for high data rate transmission. Adaptive modulation is used to make an OFDM system more efficient. It is necessary to guarantee the constant high data rate of a video stream transmission in a wireless LAN. To guarantee the highly reliable communication, a better system performance is required. We propose an adaptive RS code allocation method. In the proposed system, accurate fe... View full abstract»

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  • A new adaptive channel estimator for turbo decoding in Rayleigh fading channels

    Publication Year: 2002, Page(s):284 - 288 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB) | HTML iconHTML

    A new adaptive channel estimation filter based on the variable step-size LMS algorithm is shown to perform close to the optimum Wiener filter without assuming a-priori knowledge of the channel fading rate. It is unlike other fixed characteristics filters such as the equal weight moving average and FIR filters designed using the windowing method. Under a non-stationary Rayleigh fading channel where... View full abstract»

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  • Efficient signal enhancement scheme for adaptive antenna arrays in Nakagami multipath fading

    Publication Year: 2002, Page(s):208 - 213 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB) | HTML iconHTML

    An efficient signal enhancement scheme for an adaptive antenna array under the Nakagami fading channel is proposed. The proposed signal enhancement scheme is a modified linear signal estimator with the Toeplitz matrix approximation (TMA) method. The underlying principle of the proposed signal enhancement scheme is to reduce the noise component using not only the Lagrangian method of the constraine... View full abstract»

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  • Analysis on a stochastic model of TCP Reno

    Publication Year: 2002, Page(s):368 - 372 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (338 KB) | HTML iconHTML

    In this paper, we noticed an interesting phenomenon under a stochastic model of TCP Reno. It was found that in Reno the expectation of the time-average window size equals the average local maximum window size. We analyzed that phenomena and give both theoretical explanations and simulation results to support our finding. View full abstract»

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  • Geometrical model for mobile radio channel with hyperbolically distributed scatterers

    Publication Year: 2002, Page(s):17 - 20 vol.1
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB) | HTML iconHTML

    A geometrical channel model with hyperbolically distributed scatterers for a macrocell mobile environment is presented. This model provides the statistics of direction-of-arrival (DOA) information, as well as amplitude, time delay and phase data for wireless communication channel. The model is useful for designing a forward link beamformer. Simulation results of the channel impulse response and th... View full abstract»

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  • Scalable predictive coding as the Wyner-Ziv problem

    Publication Year: 2002, Page(s):101 - 106 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB) | HTML iconHTML

    An alternative to scalable predictive coding of first order Gauss-Markov processes is proposed in this paper. It is shown that conventional scalable predictive coding is inherently suboptimal. An alternative to scalable predictive coding, which achieves the rate-distortion performance of predictive coding for first-order Gauss-Markov processes is then proposed. The proposed approach is posed as a ... View full abstract»

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  • A differential feedback synchronous residual time stamp decoder

    Publication Year: 2002, Page(s):313 - 316 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB) | HTML iconHTML

    The synchronous residual time stamp (SRTS) method is an approved method in asynchronous transfer mode (ATM) networks for encoding and transporting the constant bit rate (CBR) service clock. The method enables the strict the jitter and wander requirements of ITU-T Recommendation G.823/G.824 to be met. The method is also applicable to non ATM networks and applications other than CBR. We review a num... View full abstract»

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  • Difference function based symbol timing recovery for OFDM systems

    Publication Year: 2002, Page(s):544 - 547 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB) | HTML iconHTML

    A difference function based symbol timing recovery algorithm for OFDM systems in presented . The algorithm is derived according to maximum likelihood (ML) algorithm utilizing cyclic prefix (CP), which is appended in front of each OFDM symbol. Simulation results show that the performance of the proposed algorithm is better than conventional ML algorithm in an additive white Gaussian noise (AWGN) ch... View full abstract»

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  • Admission control mechanism using measurement based dynamic provisioning in differentiated service networks

    Publication Year: 2002, Page(s):128 - 132 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB) | HTML iconHTML

    The differentiated service architecture is based on a simple model by applying a per-class service in the core node of the network. However, due to the simplified network behaviour, the network structure and provisioning were more complicated. If a service provider wants the dynamic provisioning or better bandwidth guarantee, signaling protocol with QoS parameters or admission control method shoul... View full abstract»

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  • A per-survivor Kalman-based prediction filter for space-time coded systems

    Publication Year: 2002, Page(s):169 - 173 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB) | HTML iconHTML

    Space-time codes have been proposed as an efficient way for improving the data rates over fading channels by employing multiple transmit/receive antennas in wireless digital communications links. To realize these gains, channel state information is assumed to be available and approximated to be constant during a data transmission burst. In this paper, a per-survivor processing (PSP) which incorpor... View full abstract»

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  • Creeper: an algorithm for decoding convolutional codes

    Publication Year: 2002, Page(s):332 - 336 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (349 KB) | HTML iconHTML

    There are two main strategies for decoding convolutional codes: the well-known Viterbi algorithm and sequential decoding. This paper presents a comparison of Creeper, an algorithm for sequential decoding, and the Viterbi algorithm. Creeper is an algorithm which combines the best properties of both the stack and the Fano algorithms. It requires less memory than the stack algorithm and has no backwa... View full abstract»

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  • Soft iterative channel estimation for turbo equalization: comparison of channel estimation algorithms

    Publication Year: 2002, Page(s):72 - 76 vol.1
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (401 KB) | HTML iconHTML

    In a receiver employing turbo equalization for an unknown, time-varying, frequency-selective channel, the channel estimate can be improved for each iteration by using soft information fed back from the decoder. The reference signal to the channel estimator is then the expected value of each transmitted symbol and not the symbol itself. Therefore, classical channel estimation theory must be applied... View full abstract»

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  • Throughput improvement on RED mechanism

    Publication Year: 2002, Page(s):599 - 603 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (317 KB) | HTML iconHTML

    The Internet Engineering Task Force (IETF) had recommended the active queue management (AQM) scheme to solve the global synchronization problems in TCP/IP based networks for next generation routers. Since then, random early detection (RED) has been proposed as one of the AQM schemes. However, the major problems of the RED mechanism are low throughput achievement and high number of consecutive drop... View full abstract»

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  • An efficient MIMO receiver structure for coded signals

    Publication Year: 2002, Page(s):416 - 420 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB) | HTML iconHTML

    A new near optimum receiver for linear MIMO channels is proposed. The main structure of this receiver is based on estimation of spatial signature matrix and soft joint detection of the received signal. In the proposed joint detector, by some modification on the feedback structure of iterative joint detectors, the probability of convergence to local minima is decreased. From various simulations, it... View full abstract»

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  • Development in QoS control for video communication

    Publication Year: 2002, Page(s):504 - 510 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB) | HTML iconHTML

    Quality of service (QoS) guarantees can be provided within a network by relying on the integrated services, differentiated services, and active networking approaches. The three approaches are presented in several papers, but none provide a comparison between all of them. Therefore, this paper overviews the key functionality and the relative strengths and weaknesses of video-specific QoS control te... View full abstract»

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