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Thread: TETRA conference papers

  1. #1
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    Default TETRA conference papers

    A Diversity Reception Scheme for TETRA Multi-carrier System

    Abstract—A maximal ratio combination(MRC) diversity
    reception scheme for TETRA multi-carrier system is present.
    TETRA enhance data service(TEDS) standard adopts Filter-
    Bank Multi-Carrier Modulation(FBMCM) and QAM schemes
    in order to improve the transmission rate. Space diversity is
    considered as an efficient way to reduce the impact of fading.
    TEDS specifies its own preamble for timing synchronization,
    frequency offset estimation and channel equalizer. In this
    paper, a MRC diversity reception scheme which makes use of
    the special preamble is proposed. Simulation result shows that
    the proposed schemes exhibit good performances in the
    channel model defined in TETRA.

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    Default Re: TETRA conference papers

    Traffic Performance Evaluation of Data Links in TETRA and TETRAPOL

    Abstract
    TETRA and TETRAPOL are competitors in the market of Professional Mobile Radio (PMR). In a previous
    study [1] we compared the trunked mobile radio systems TETRA V + D and TETRAPOL by evaluating random
    access performance. Here we present a comparison of the TETRA and TETRAPOL error correction schemes
    involved to secure LLC data links. The traffic performance of both systems was compared for ETSI scenario
    8 [2]. Realistic models for the effects of propagation circumstances and co-channel interference are taken into
    account. The results of the traffic performance measurements exhibit differences in connection set-up times
    and transmission delays for data links in TETRA and TETRAPOL systems in favour of the TETRA system
    and reveal a strong dependency on random access delays
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    Last edited by AlexSSS; 2012-04-13 at 02:34 PM

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    Default Re: TETRA conference papers

    Research on the Assignment Mechanism of TETRA Event Labels

    Abstract— An event label is temporary shortened form of address
    defined in TETRA specifications, and it can save more bits in the
    air interface, compared to a Short Subscriber Identity (SSI).
    Because there is quite limited literature related to event labels,
    event labels are not supported in most TETRA systems yet. A
    novel assignment mechanism, including the data structure and a
    detailed SDL state chart, is presented in this paper. This paper
    introduces the basic concept of event labels and evaluates the
    impact of event labels in four most common used TETRA
    services: voice call setup, short data service, group
    attachment/detachment and packet data service. Simulation
    results show event labels will improve the performance of short
    data services, group attachment/ detachment and packet data
    services.
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    Default Re: TETRA conference papers

    Connectivity and Coverage in Finite TETRA System

    Abstract—In finite TETRA system, base stations can be formed
    in wireless muti-hop fashion. This paper investigates two
    fundamental characteristics of a wireless base station network:
    its connectivity and its maximum coverage area. First, by
    analyzing the isolated node, we obtain the relationships
    between the number of nodes, transmission range and network
    connectedness. Based on the results of connectivity, we
    calculate the minimum number of frequencies of each base
    station should maintain. Furthermore, we propose a theorem
    to determine the topology of a connected network achieving the
    maximum coverage area.
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    Default Re: TETRA conference papers

    Characterization of Impedance Variations in
    antennas for TETRA terminals


    Abstract—Antenna input impedance is usually considered as
    a non-dynamical magnitude, which remains constant during the
    transmission or reception process. The main advantage is that
    it allows to simplify matching circuit design. However, in an
    actual situation, the impedance value is a dynamic quantity
    that can be very different compared to the static value. In this
    paper, we propose a histogram based method in order to identify
    the impedance variation of TETRA antennas. The statistical
    approach is carried out in the matching domain rather than in the
    impedance domain, because in this way the random vector has
    a compact support. The method is applied to model a practical
    situation where the terminal position changes from the user’s
    pocket to the head, obtaining a bimodal distribution which cannot
    be identified directly by means of parametric methods. We prove
    experimentally that the dynamical values are different from the
    results obtained in an anechoic chamber, and it is required to
    perform a cluster analysis or a non parametric method to identify
    accuratelly the probability density function which characterizes
    the antenna impedance.
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    Default Re: TETRA conference papers

    Performance Evaluation of Phase Modulation
    Schemes for TETRA Application


    Abstract—Phase Modulation schemes have been extensively
    used in mobile systems. TETRA -1 supports π/4-DQPSK,
    where as TEDS supports π/8-D8PSK along with QAM
    schemes in order to achieve higher data rate. In this paper
    the performance of phase modulation schemes over TETRA
    propagation models TU-5, TU-50 and HT-200 is presented.
    Implementation of higher order modulation schemes help
    understanding the performance of Phase modulations
    schemes for broadband TETRA. Implementation efficiency
    is analysed in terms of Message Error Rate (MER) against
    Es/No over SCH\F channel for downlink bursts in the
    400MHz TETRA frequency bands.
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    Last edited by AlexSSS; 2012-04-15 at 06:10 PM

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    Default Re: TETRA conference papers

    Voice End-to-End Encrypted for TETRA
    Radiocommunication System


    Abstract— The standard TETRA (Terrestrial Trunked Radio)
    system addresses a number of security issues, one being the
    cryptographic protection of signaling data and user data on the
    highly exposed air interface. However, user data travels
    unencrypted within the network infrastructure. This precludes
    the use of TETRA systems by those users who regard their
    transmissions as particularly sensitive, and whose Security Policy
    requires all such data to be appropriately encrypted whilst in
    transit between the end terminals in any system. End-to-end
    encryption addresses these concerns by encrypting data within
    the transmitting terminal, and only decrypting it within the
    receiving terminal. The plain data is never exposed within the
    infrastructure; in fact the infrastructure contains no mechanism
    to recover it should it wish to do so.
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    Default Re: TETRA conference papers

    Monitoring and Analysis of TETRA Base Station
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    Default Re: TETRA conference papers

    A Real-Time Intelligent Wireless
    Mobile Station Location Estimator with
    Application to TETRA Network


    Abstract—Mobile location estimation has received considerable interest over the past few years due to its great potential in different
    applications such as logistics, patrol, and fleet management. Many mobile location estimation techniques had been proposed to
    improve the accuracy of location estimation. Location estimation based on artificial intelligence techniques is a recent alternative
    approach. In this paper, Adaptive Neuro-Fuzzy Inference system (ANFIS) is used as a robust location estimator to locate the mobile
    station (MS) using the MS geo-fencing area data within 9 km from a serving base station. Extensive evaluations and comparisons have
    been performed, and a set of statistical parameters has been obtained. From the comparison of the proposed ANFIS estimator with the
    neural-network-based estimators, it is found that ANFIS estimator is faster and more robust. Its Average Computation Time (ACT) is
    0.076 sec. While the ACT for Multilayer Perceptron (MLP) and Radial-Based Function (RBF) neural networks is 0.88 and 1.7,
    respectively. Whereas on comparing ANFIS with other techniques, it is found that in ANFIS estimator, 67 percent of the estimated
    location errors do not exceed 149 m, while these for the statistical, multiple linear regression, and geometric are 170, 280, and 2,346 m,
    respectively. Thus, the results clearly reveal that the proposed ANFIS estimator outperforms all other techniques.
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    Default Re: TETRA conference papers

    General System Architecture of TETRA Network for Public Safety Services

    Abstract
    – In the ten years since TETRA (Terrestrial Trunked Radio) standard from ETSI (European
    Telecommunications Standards Institute) has been available on the worldwide market, it has become the leading
    PMR (Private/Professional Mobile Radio) technology of choice especially in networks for public safety. Since it
    was first standardized the system evolved in various directions, both in application and technology point of view.
    This paper gives an overview of general TETRA system arhitectures available on the market today. It also gives
    an in depth analisys of a specific IP based TETRA system core elements and their function in the overall
    communication process.
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