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IEE Proceedings - Communications

Issue 5 • Date Oct. 2006

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Displaying Results 1 - 25 of 29
  • New linear codes derived from binary cyclic codes of length 151

    Publication Year: 2006, Page(s):581 - 585
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (174 KB)

    The minimum distance of all binary cyclic codes of length 151 is determined. Almost all of these cyclic codes have the same parameters as the best linear codes given in Brouwer's database. A nested chain of linear codes is derived from these cyclic codes and some new binary codes are obtained by applying Constructions X and XX to pairs of codes in this chain. Good candidates for nested codes can a... View full abstract»

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  • Improved performance SOVA turbo decoder

    Publication Year: 2006, Page(s):586 - 590
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (185 KB)

    A novel approach for improving the performance of the soft-output Viterbi algorithm (SOVA) when applied to turbo decoding is proposed. Based upon a modified two-step scaling factor approach for the decoder's extrinsic information, it is shown that the proposed technique reduces significantly the error floor present in previous SOVA-based turbo decoding techniques. Various computer simulated bit er... View full abstract»

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  • Geometric augmented product codes

    Publication Year: 2006, Page(s):591 - 596
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    We propose a new simple decomposable code construction technique that generates codes with the full information rate for all of the minimum Hamming distance-4 binary linear block codes of even length greater than or equal to eight. Additionally, some optimal Hamming distance-8 and higher distance codes are obtained with our proposed scheme. A generic trellis structure for the proposed codes was al... View full abstract»

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  • Hybrid list decoding and Kaneko algorithm of Reed-Solomon codes

    Publication Year: 2006, Page(s):597 - 602
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (261 KB)

    The authors present a hybrid list decoding and Kaneko algorithm for Reed-Solomon (RS) codes. A new ruling out scheme motivated from Takuya Koumoto's work for a reduced-complexity list decoding algorithm, which reduces the complexity of the hybrid algorithm, is also proposed. Simulation results show that the performance of the hybrid algorithm for both (15, 7) and (31, 21) RS codes is comparable wi... View full abstract»

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  • Asymmetric rate compatible turbo codes in hybrid automatic repeat request schemes

    Publication Year: 2006, Page(s):603 - 610
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (321 KB)

    The authors present asymmetric turbo hybrid automatic-repeat-request (ATH-ARQ) schemes that employ component code selection and asymmetric rate compatible punctured turbo codes (ARCPT) for enhanced performance in fading channels. The paper also presents a novel low-rate ARCPT encoder structure. An analysis is presented for efficient ARCPT puncture schemes for improved throughput performance at low... View full abstract»

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  • ARQ scheme with adaptive block size for bidirectional wireless endoscopy system

    Publication Year: 2006, Page(s):611 - 618
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (662 KB)

    By analysing the characteristics of the communication channel in a bidirectional digital wireless endoscopy system, the authors propose an efficient automatic repeat query (ARQ) scheme, with a dynamically adaptive block size, a high data rate and an ultra-short communication distance. Two new strategies for adaptive block-size decision are also proposed. The optimum block-size formula for the wire... View full abstract»

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  • Multi-interval line coding technique for high speed transmissions

    Publication Year: 2006, Page(s):619 - 625
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    A multi-interval line coding (MILC) technique which operates over blocks of intervals is proposed to increase the transmission rate without expanding the bandwidth or using higher order signalling. This is done by dividing every interval into sub-intervals, and allowing the signals to make amplitude transitions at the end of sub-intervals. However, the waveforms are generated by maintaining the du... View full abstract»

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  • Tight lower bounds on the symbol error rate of uncoded nonuniform signalling over AWGN channel

    Publication Year: 2006, Page(s):626 - 632
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    New Bonferroni-type lower bounds on the word error probability of uncoded systems are developed. The new family of bounds is based on a recent Bonferroni inequality proposed by Cohen and Merhav. These novel tight bounds are developed for optimal maximum a posteriori (MAP) coherent detectors with nonuniform signalling over additive white Gaussian noise channel. The results are compared to the state... View full abstract»

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  • Time domain implementation of space-time/frequency block codes for OFDM systems

    Publication Year: 2006, Page(s):633 - 638
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (195 KB)

    Spatial diversity is a widely applied technique for enhancing the wireless system performance, since it greatly reduces the detrimental effects of multipath fading. Orthogonal space-time block codes are considered to be a good choice for spatial diversity, as they provide full diversity without any channel state information at the transmitter. The standard frequency domain application of these blo... View full abstract»

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  • GDH group-based signature scheme with linkability

    Publication Year: 2006, Page(s):639 - 644
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    Recently, a linkable ring signature scheme (called the LWW signature scheme), exhibiting the properties of anonymity, linkability and spontaneity, was presented. Its security is based on the decision Diffie-Hellman (DDH) problem. The distinguishing feature of the LWW signature scheme that differentiates it from other ring signature schemes is linkability, i.e. two signatures by the same signer can... View full abstract»

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  • Low complexity LMMSE channel estimation for OFDM

    Publication Year: 2006, Page(s):645 - 650
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (357 KB)

    The authors propose low complexity versions of a linear minimum mean square error (LMMSE) channel estimator for orthogonal frequency division multiplexing (OFDM) systems. They partition the channel autocorrelation matrix in the LMMSE estimator into small sub-matrices. The size of sub-matrix is determined by channel coherence bandwidth, a range of highly correlated channel frequency responses. Sinc... View full abstract»

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  • Estimating errors in transmission systems due to impulse noise

    Publication Year: 2006, Page(s):651 - 656
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    Impulse noise is a major limiting factor to the performance of digital subscriber lines, powerline communication systems, and digital TV. Research has shown that the impulse noise in all those transmission media has very similar statistical properties. Using noise distribution parameters for the specific case of telephone lines, this paper suggests a Bernoulli-Weibull model of impulse noise in the... View full abstract»

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  • Adaptive channel aided decision feedback equalisation for SISO and MIMO systems

    Publication Year: 2006, Page(s):657 - 663
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Error propagation can seriously affect the performance of an adaptive decision feedback equaliser (DFE), especially when operated in time-varying channel environments. Error propagation not only affects DFE decisions, but also disturbs the DFE adaptation. The paper focuses on improving the robustness against error propagation for the least-mean-square (LMS) based minimum mean-squared-error DFE (MM... View full abstract»

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  • Constant hardware delay in integrated switching elements with multiserver output queues

    Publication Year: 2006, Page(s):664 - 670
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    The authors consider an integrated switching element with a shared buffer memory and a constant hardware delay. This hardware delay is caused by the hardware operations required to process the routing information of incoming cells. A general uncorrelated cell arrival process in the switch, an independent and uniform routing process of cells from the inlets to the outlets of the switch and a first-... View full abstract»

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  • Fast bandwidth-constrained shortest path routing algorithm

    Publication Year: 2006, Page(s):671 - 674
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (141 KB)

    QoS routing has been a critical issue for providing QoS in high-speed networks. The authors present the design of a fast routing algorithm for selecting the shortest path connecting a pair of nodes subject to a bandwidth constraint. The algorithm works by combining the strategies of informed search and backwards routing. Its worst-case computational complexity is deduced to be O(|E|lg|V|), where |... View full abstract»

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  • Effective congestion control for QoS enhancement of self-similar multimedia traffic

    Publication Year: 2006, Page(s):675 - 682
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (735 KB)

    Owing to the existence of noticeable concentrated periods of contention and idleness, self-similar traffic can greatly increase packet delay and loss probability and thus reduce system resource utilisation. The development of efficient congestion control mechanisms plays a central role in the improvement of network quality of service (QoS), in particular for real-time multimedia applications. By e... View full abstract»

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  • Traffic characteristics of aggregated module downloads for mobile terminal reconfiguration

    Publication Year: 2006, Page(s):683 - 690
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (997 KB)

    In recent years, there has been an increasing proliferation of reasons for software/firmware in desktop computers to be upgraded over the Internet, and as computational devices continue to become ever more advanced and compact, it is anticipated that the same will be the case for mobile terminals in the near future. In this paper, we consider some important characteristics of such upgrade traffic.... View full abstract»

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  • End-point synchronisation and handover for multi-homed services

    Publication Year: 2006, Page(s):691 - 696
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (378 KB)

    It is proposed to implement a synchronised routing table at the transport layer, referred to as an association routing table (ART), to improve the performance of multi-homed transport protocols. An algorithm is described that ensures that the routing tables can be synchronised, which is then used to implement a handover mechanism. The ART is implemented within the stream control transmission proto... View full abstract»

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  • Performance analysis of an improved power-saving medium access protocol for IEEE 802.11 point coordination function WLAN

    Publication Year: 2006, Page(s):697 - 704
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    Wireless enabled portable devices must operate with the highest possible energy efficiency while still maintaining a minimum level and quality of service to meet the user's expectations. The authors analyse the performance of a new pointer-based medium access control protocol that was designed to significantly improve the energy efficiency of user terminals in wireless local area networks. The new... View full abstract»

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  • Performance analysis and comparisons of different ultra-wideband multiple access modulation schemes

    Publication Year: 2006, Page(s):705 - 718
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (361 KB)

    The multiuser performance of two kinds of ultra-wideband (UWB) systems, namely, multi-carrier frequency-hopping-UWB and time-hopping-UWB, is evaluated. We derive the bit error rate of these systems in both AWGN and fading channels. Our numerical results show that the TH-UWB system always outperforms the MC-FH-UWB system with non-coherent detection. However, the MC-FH-UWB system with coherent detec... View full abstract»

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  • Adaptive MLSD receiver employing noise correlation

    Publication Year: 2006, Page(s):719 - 724
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (507 KB)

    A per-survivor processing (PSP) maximum likelihood sequence detection (MLSD) receiver is developed for a fast time-varying frequency-selective Rayleigh fading channel with coloured additive noise, which follows an autoregressive (AR) model with unknown parameters. The correlation between noise samples is exploited to considerably enhance the performance of the communications. The maximum likelihoo... View full abstract»

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  • Asymptotic spectral efficiency of MC-CDMA with multiple antennas

    Publication Year: 2006, Page(s):725 - 732
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    The asymptotic spectral efficiency of multicarrier CDMA (MC-CDMA) with multiple transmit and receive antennas is analysed in this paper. The closed-form spectral efficiency is derived when matched filter and minimum mean square error (MMSE) front ends are employed. We consider the effect of the number of transmit and receive antennas on the performance of spectral efficiency. The spectral efficien... View full abstract»

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  • Blind multiuser receiver for DS-CDMA wireless system

    Publication Year: 2006, Page(s):733 - 739
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (303 KB)

    We consider blind signal detection in an asynchronous code-division multiple-access (CDMA) system employing short spreading sequences in the presence of unknown multipath fading. This approach is capable of countering the presence of multiple-access interference (MAI) in CDMA fading channels. The proposed blind multiuser detector is based on an independent component analysis (ICA) to mitigate both... View full abstract»

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  • Generation and upper bound of one-coincidence sequences in frequency-hopping multiple-access systems

    Publication Year: 2006, Page(s):740 - 745
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (205 KB)

    In frequency-hopping one-coincidence sequences, a specified distance between two adjacent symbols is usually employed to reduce the interference among sequences. We propose a new algorithm to construct one-coincidence sequence sets satisfying distance constraints. Compared to the conventional method, our approach provides a more flexible and general way to generate one-coincidence sequences of var... View full abstract»

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  • Single-carrier and multi-carrier space-time block coded transmissions over doubly selective fading channels

    Publication Year: 2006, Page(s):746 - 754
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (383 KB)

    We propose a multi-stage successive interference cancellation (SIC) receiver for arbitrary linear space-time block codes (STBCs) over general time-frequency selective fading channels with single-carrier (SC) transmissions. The proposed receiver adopts the SIC approach to handle inter-symbol interference (ISI) owing to multipath propagation. Simulation results show that the proposed receiver outper... View full abstract»

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