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Advances in Satellite and Space Communications (SPACOMM), 2010 Second International Conference on

Date 13-19 June 2010

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Displaying Results 1 - 25 of 39
  • [Front cover]

    Page(s): C1
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  • [Title page i]

    Page(s): i
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  • [Title page iii]

    Page(s): iii
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  • [Copyright notice]

    Page(s): iv
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  • Table of contents

    Page(s): v - vii
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  • Preface

    Page(s): viii - ix
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  • Organizing Committee

    Page(s): x - xi
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  • Reviewers

    Page(s): xii - xiii
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  • Time-of-Arrival Estimation by Means of SAGE for IR-UWB in the Presence of Pulse Overlap

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (559 KB) |  | HTML iconHTML  

    In this paper we present a low-complexity iterative algorithm to estimate the Time of Arrival (ToA) of an Impulse-Radio Ultra Wide Band (IR-UWB) system with pulse overlap between the first two paths. The performance of this SAGE estimation algorithm is compared with that of the optimal estimator. We find that, although the SAGE algorithm is unable to determine a tight ToA estimate when the delay between the two paths is very low, its performance converges quickly to that of the optimal estimator for moderate path delays. View full abstract»

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  • Cooperative Deep Space Communications at Ka Band: Outage Performance Analysis

    Page(s): 5 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB) |  | HTML iconHTML  

    In this paper, a preliminary investigation is carried out on the possible advantages of employing cooperative diversity to support next generation deep space networks envisaged to operate at Ka band. The background idea is to benefit from recent advances in cooperative protocols by relaying downlink signals from the spacecraft through a geostationary satellite to mitigate tropospheric fading. Numerical comparisons based on the outage probability for practical system parameters reveal great performance improvements. View full abstract»

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  • Ka-Band Multi-port Power Amplifier Calibration Experiment and Results

    Page(s): 11 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB) |  | HTML iconHTML  

    A multi-port power amplifier (MPA) is a multi-input multi-output system that is capable of amplifying multiple input signals simultaneously by a set of shared power amplifiers without mutual interference. In a practical MPA, the component imperfections reduce the port isolation, which introduces leakage or cross-port interference. A patent-pending type-based calibration technique is studied in this paper. It exploits the uniqueness of the statistics for a given communication signal to estimate a calibration matrix that minimizes the effects of the MPA impairments and suppresses the cross-port interference. Experimentation with a 4-port 20 GHz prototype MPA subsystem is conducted to evaluate the type-based calibration technique. Results show that it can accurately estimate the calibration matrix to improve the MPA performance significantly. View full abstract»

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  • Analysis of Filter Parameter Influence on Communication Quality Using LabVIEW

    Page(s): 15 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2012 KB) |  | HTML iconHTML  

    In this paper, after theoretical background on pulse-shaping, a user interface for calculating the communication quality of a satellite communication system is given. The program is designed with National Instruments' LabVIEW. Simulation results show that in space communications it is recommended to use pulse-shaping filter before sending the information through channel since this reduces the intersymbol interference and ensures a better communication. It is advised to use the root raised cosine filter. Analyzing the bit error rate showed that by increasing the roll off factor of a pulse-shaped filter communication quality also increases. View full abstract»

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  • Advanced Fine-Acquisition Scheme for E5a Signal on Galileo Giove-B

    Page(s): 21 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (291 KB) |  | HTML iconHTML  

    This paper proposes the advanced fine-acquisition scheme using the E5a signal transmitted from the Galileo GIOVE-B satellite. The proposed approach is based on the code phase changes which occur during the acquisition processing time originating in the Doppler frequency. The proposed scheme detects a fast code phase within about 1 chip near the estimated code phase and improves the accuracy of the Doppler frequency in comparison with the conventional scheme. The feasibility of the proposed schemes is demonstrated through simulation. View full abstract»

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  • SiGe BiCMOS Chip Sets for Use in an X-Band Multi-function Chip

    Page(s): 25 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (901 KB) |  | HTML iconHTML  

    SiGe Radio Frequency Integrated Circuits have been designed and fabricated for use in the X-band Si-based multi-function chip, which is known as a core-chip for a Transmit/Receive module of a phased array radar systems. In this paper, six kinds of Radio Frequency Integrated Circuits will be presented such as a power amplifier, a digital serial-to-parallel converter, a Single-Pole-Double-Throw switch, an 8 dB attenuator, a 16 dB attenuator, and a 45 degree phase shifter. The power amplifier based on a cascode configuration using SiGe HBTs shows the Radio Frequency performance of the 12 dB gain and 19 dBm P1dB. The other five chips have been designed using 0.25 um Complementary Metal-Oxide Semiconductor technology. The digital serial-to-parallel converter shows the perfect functional operation to 20 MHz clock. The Single-Pole-Double-Throw switch, the 8 dB and 16 dB attenuations, and the 45 degree phase shifter show good Radio Frequency performances. The most of chip sizes are very small to be lower than 1 mm2. These chip sets may make an attractive solution for a high power X-band multi-function chip for a T/R module of a phased array radar system. View full abstract»

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  • Solar Paddle Antenna Mounted on Pico-Satellite "KUKAI" for Amateur Radio Communication

    Page(s): 31 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1304 KB) |  | HTML iconHTML  

    This paper describes solar paddle antenna proposed in the development of Kagawa Satellite “KUKAI.” KUKAI is a mother-daughter pico-satellite for technical verification of a tethered space robot. The mother and the daughter satellites communicate respectively with the ground station by amateur radio frequencies. For the purpose of simple deployment system on orbit and antenna directivity suitable for KUKAI, antenna, which communicates with a ground station, mounted at the edge of a solar paddle is employed. After complete antenna adjustment on the ground, KUKAI was launched on 23 January 2009 by the H-IIA rocket from Tanegashima Space Center. The solar paddles were successfully deployed, and communication through the solar paddle antenna was succeeded. View full abstract»

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  • A Band-Notched UWB Microstrip Antenna with a Resonance Back C-Shaped Ring

    Page(s): 37 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB) |  | HTML iconHTML  

    In this paper, a new band-notched microstrip-fed planar monopole Ultra wideband (UWB) antenna is proposed in which band-notched characteristics are realized by a rear C-shaped ring resonator. Exponential shape of lower edges of patch and upper edges of ground plane are investigated which provide an excellent impedance bandwidth over the entire UWB band, exclusive of the notched band. Measurements indicate that antenna with omni-directional pattern operates in the band from 2.25-10.2 GHz and has band-rejected characteristics in 5.16-5.85 GHz which covers Wireless Local Area Network (WLAN) band. View full abstract»

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  • Low-Power Baseband Folded Gilbert Cell Mixer for Frequency-Domain A/D Converter in 0.18 µm CMOS

    Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    This paper presents the design and analysis of a low-voltage down-conversion mixer in 0.18-μm CMOS for baseband frequency-domain ultra wide band SATCOM systems analog-to-digital conversion. The folded topology allows the transconductance and Local Oscillator (LO) stages to have different bias current. Consequently, the mixer implements a two-pole low-pass filter in the switching pair stage, considering the low LO pair bias current. Furthermore, the effect of LO switching pairs width on the flicker noise mixer performance is studied, and the flicker noise, DC offset trade-off is obtained with an optimum LO transistors size value. The mixer consumes 6.8 mW from a 1.8-V supply, and achieves a voltage conversion gain (CG) of 2.8-8.2 dB, a single-sideband noise figure (NF) of 11.3-34.6 dB, a second-order intermodulation intercept point (IIP2) of 42.6- 47 dBm, and a third-order intermodualtion intercept point (IIP3) of -3.8 to -2 dBm. Concerning the port-to-port isolation issue, the average simulated LO-to-RF and LO-to-IF are -85.9 and -125.3 dB respectively. View full abstract»

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  • A New Channel Assignment Strategy for Low Earth Orbit Mobile Satellite Systems

    Page(s): 47 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (281 KB) |  | HTML iconHTML  

    In LEO satellites networks, dropping probability of handoff calls and blocking probability of new calls are two important QoS measures. In this paper, a new channel assignment strategy is proposed to improve QoS performance in low earth orbit satellite systems (LEO-MSSs). Different from previous channel assignment schemes, the proposed strategy is designed to improve the QoS performance of LEO-MSSs by decreasing the average times of handover along the calls duration instead of deducing failure probability of single handover request. In addition, recursive formulas are derived to deal with complexity of computing dropping probability of handoff calls and blocking probability of new calls. Numerical results reveal that the proposed scheme could effectively deduce the dropping probability and unsuccessful call probability. View full abstract»

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  • Performance Analysis of Threshold Call Admission Policy for Multi-class Traffic in Low Earth Orbit Mobile Satellite Systems

    Page(s): 52 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (331 KB) |  | HTML iconHTML  

    In this paper, a novel and efficient analytical method is developed for evaluating the performance of threshold call admission policy for multi-class traffic in low Earth orbit mobile satellite systems. It eliminates the need of running very time-consuming and computationally intensive computer simulations as well as serves as the groundwork for developing performance optimization algorithms. The proposed analytical approach is based on a multi-dimensional Markov queuing model. Its effectiveness and accuracy have been validated by extensive computer simulations. View full abstract»

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  • Design of a Multi-mission Satellite Ground Station for Education and Research

    Page(s): 58 - 63
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    Satellite space missions need ground stations for mission control and data communication. In this paper we present a modular ground station, which will be used for nano and pico satellites. The frequency bands initially supported are VHF, UHF, and S-band around 145 MHz, 435 MHz, and 2.3 GHz, respectively. We present a flexible, layered approach, which is ideally suited for multiple missions and allows for the addition of further frequency bands and missions. Furthermore, it allows seamless inclusion of the ground station in ground station networks. The ground station is designed for research as well as education and training of students. View full abstract»

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  • Routing and Scalability Issues for Multi-layered Satellite-HAPs Networks

    Page(s): 64 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1399 KB) |  | HTML iconHTML  

    The main features of the future mobile communication systems are the provisioning of high-speed data transmissions (up to 1 Gb/s) and interactive multimedia services. For effective delivery of these services, the network must satisfy some strict quality-of-service (QoS) metrics, defined typically in terms of maximum delay and/or minimum throughput performances. According to this general vision, the integration of different layered network plays one of the most important roles in the next telecommunication systems, for this reason, the paper studies the performance of a routing algorithm, well suited for an integrated Satellite-High Altitude Platform (HAP) system, in terms of network dimension and scalability in order to guarantee an adequate quality of service to multimedia traffic connections. View full abstract»

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  • How is SCTP Able to Compete with TCP on a QoS-Aware Satellite Network?

    Page(s): 70 - 75
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    Transport protocols have been developed at first for terrestrial networks, but they are also used on communication satellite networks which have specific characteristics such as low bandwidth, QoS architecture and large latency. TCP and SCTP have been intensively studied in several circumstances, recommendations have been provided and results obtained. We are going to use the research done in order to study SCTP and TCP behavior on a satellite network implementing QoS architecture. Our intentions are to explain and predict the behavior of the transport protocols on such networks. The settings of these transport protocols will be studied in order to prove how they can be both improved on a satellite network with a QoS architecture. View full abstract»

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  • Enhancing Multimedia Experience in Satellite Communication Systems with AQM-Based Traffic Controllers

    Page(s): 76 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    This paper deals with an algorithm of the Satellite Terminal, more precisely, it contributes to the Quality of Service management of the return link, a central problem in satellite network (compared to wire network) due to the satellite delay and the scare uplink resources. Instead of oversizing the connection, which could be very expensive, we aim at reaching an optimal exploitation of uplink resources. In order to solve this problem, we design a congestion control mechanism (an Active Queue Management). This mechanism is equivalent to a controller designed by using the Automatic methods. This article treats two different Active Queue Management strategies, a robust proportional integral and a robust deadtime based controllers. These mechanisms are applied to an existing model of the Transmission Control Protocol for wire network that we adapt to the satellite network. The different methods are simulated on Network Simulator and compared to the DropTail mechanism. View full abstract»

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  • Self Encoded Spread Spectrum Communication with FH-MFSK

    Page(s): 82 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (413 KB) |  | HTML iconHTML  

    Self-encoded spread spectrum (SESS) is a novel communication technique that derives its spreading code from the randomness of the source stream rather than using a more conventional pseudo-random noise (PN) code for frequency translation. This paper proposes a SESS method enabling a random source stream to fast frequency hop a carrier while maintaining acceptable error performance compared to a non-SESS system. It has been shown through simulation that a SESS based frequency hopped system remains stable and can serve as the foundation of a practical SESS-FH system in the presence of jammers. View full abstract»

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  • On the Capacity of 3-D Space-Time Correlated HAP-MIMO Channels

    Page(s): 87 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    High altitude platforms (HAPs) are one of the most promising alternative infrastructures for realizing next generation wireless networks. Considering a HAP-based communications system, this paper investigates the capacity of spatially and temporally correlated multiple-input multiple-output (MIMO) channels achieved with uniform linear arrays (ULAs). In particular, a recently proposed three-dimensional (3-D) reference channel model for HAPs is utilized. Various parameters, such as the elevation angle of the platform, the array configuration, the user mobility, and the 3-D non-uniform distribution of the scatterers are considered. The numerical results demonstrate the effect of these parameters on the channel capacity. View full abstract»

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