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Selected Areas in Communications, IEEE Journal on

Issue 4 • Date September 1983

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1983 , Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1983 , Page(s): 0
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    Freely Available from IEEE
  • Foreword: Millimeter Wave Communications Systems

    Publication Year: 1983 , Page(s): 577 - 579
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    Freely Available from IEEE
  • Advanced Communications Satellite Systems

    Publication Year: 1983 , Page(s): 580 - 588
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (859 KB)  

    Demand for in-orbit capacity through the use of satellite systems will continue throughout the next two decades. The potential of the 30/20 GHz frequency band for fixed satellite services will be exploited. However, many technology questions must be answered if the band is to be used commercially because of the high rain fades that can occur at these high frequencies. NASA has conducted a technology development program in high gain antenna and on-board switching and processing systems which can be combined such that cost competitive services are possible at acceptable rain outage percentages. Other supporting technologies have also been pursued including transmitters, both tube type and solid state, and low noise receivers. The critical technologies have been combined into an experimental satellite payload; an experimental flight is planned to verify these technologies and enable development of operational systems. Implementation of such systems would be by commercial carriers and could occur in the early 1990's, depending on the demand for additional or bit capacity. The high capacity systems that can be made possible through the use of the 30/20 GHz band and the employment of frequency reuse technology will contribute to the continued downward trend in circuit costs and may allow new and innovative satellite services. View full abstract»

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  • An Integrated Design Approach to 30/20 GHz Trunking Systems

    Publication Year: 1983 , Page(s): 589 - 599
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1131 KB)  

    A design procedure for 30/20 GHz trunking systems is presented which permits the joint optimization of the satellite links and the terrestrial links between diversity terminals of individual earth stations. This process involves the generation of uplink and downlink power control functions (PCF's), which depend on 1) the rapidity with which power control can be exercised, relative to the rate of variation of atmospheric attenuation, and 2) the available uplink and downlink HPA power. The PCF's combine to produce a link availability curve (LAC), which describes the uplink/downlink fade combinations for which a specified bit error rate (BER) can be maintained. The set of required terminal separation distances (TSD's) can generally be computed from the LAC, together with the marginal uplink and downlink attenuation distributions. Methods of implementing uplink and downlink power control are discussed. In particular, several alternatives for determination of uplink attenuation and selection of the appropriate transmit terminal are contrasted. View full abstract»

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  • 30/20 GHz Band SCPC Satellite Communication Using Small Earth Stations

    Publication Year: 1983 , Page(s): 600 - 608
    Cited by:  Papers (1)  |  Patents (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (723 KB)  

    This paper presents a domestic satellite communication system accommodating numerous 30/20 GHz band small earth stations emphasizing the system outline, the use of multiple-access (MA) techniques. It also describes associated earth station configurations, equipment performance, and experimental results using the Japanese CS (medium capacity communications satellite for experimental purposes). Two kinds of earth stations are employed in this system, a small earth terminal (SET) and a master earth station (MES). The SET, which has an antenna about 2 m in diameter, is placed near a subscriber. The MES, which has an 11.5 m diameter antenna, is connected to the terrestrial telephone network through a satellite telephone switching center (STC). There are about 50 two-way channels with bit rates of 32 kbits/s which are achieved through the use of a 30/20 GHz band transponder whose EIRP is about 71.5 dBm, a G/T of about 2.7 dB/K and an SET's antenna diameter of 1.8 m. This results in a system availability of 99.5 percent under typical Japanese statistical rain attenuation data. To enable a demand-assigned MA technique to be employed in this system, a single channel per carrier (SCPC) is selected, taking into consideration power efficiency of the SET, flexibility of system configurations, and the adaptability of the adaptive power control during rainy periods. View full abstract»

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  • A 40 GHz Railway Communication System

    Publication Year: 1983 , Page(s): 615 - 622
    Cited by:  Papers (6)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1626 KB)  

    The operation of modern railway systems requires a high degree of safety and reliability. This can be accomplished using millimeter waves for communication and control. A 40 GHz line-of-sight transmission system connects a traffic control center with all trains on the line. The construction and the performance of such a 40 GHz railway communication system is described in detail with respect to system aspects and millimeter wave component design. View full abstract»

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  • 30 GHz Band Low Noise Receiver for 30/20 GHz Single-Conversion Transponder

    Publication Year: 1983 , Page(s): 645 - 653
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    This paper describes the design and performance of a low noise multicarrier receiver for a 30/20 GHz single-conversion satellite transponder. To develop a low noise receiver the following areas were examined: 1) analysis of spurious signals, 2) selection of devices most suitable for use on board the satellite, and 3) level diagram tradeoff studies. The receiver consists of a 30 GHz low noise GaAs FET amplifier, a 30/20 GHz GaAs Schottky barrier diode mixer, a dielectric resonated local oscillator, a 20 GHz high gain GaAs FET amplifier, and a 20 GHz high power (0.5 W) GaAs FET amplifier. The receiver has an 8 dB noise figure and a 48 dB gain in the frequency range from 28.395 GHz to 29.015 GHz (620 MHz frequency bandwidth). View full abstract»

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  • A 20 GHz Band 0.5 W GaAs FET Amplifier for Satellite Communications

    Publication Year: 1983 , Page(s): 654 - 657
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    GaAs FET amplifier modules for 20 GHz band satellite communications have been developed using newly developed power FETs. The deep recess gate structure was adopted in the power FET, which improved both power output capability and power gain. Power added efficiency of 22 percent with more than 1 W power output has been achieved with 3 mm gate width FETs. The amplifier modules containing two-stage internally matched FET's can be hermetically sealed in metal packages. The modules had 8.4-8.9 dB linear gain in the 17.7-18.8 GHz band and 7.9-8.4 dB linear gain in the 18.5-19.6 GHz band. The power output at 1 dB gain compression point was more than 0.5 W. The third-order intermodulation distortion ratio was 81-83 dB at 18.2 GHz and 77-80 dB at 18.9 GHz, when individual output signal power was -4 dBm. View full abstract»

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  • Adaptive Diversity Combining for Improved Millimeter Wave Communication through Rain

    Publication Year: 1983 , Page(s): 686 - 694
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (830 KB)  

    Under severe rain conditions there may be significant amounts of multiply-scattered millimeter wave radiation present in the vicinity of the receiving antenna for a satellite downlink. This paper explores angle diversity reception of the scattered radiation as an alternative to spatial (multiple site) diversity for ameliorating rain attenuation. Results from scalar plane-wave transport theory for the attenuation, angle-of-arrival spread, multipath spread, and Doppler spread of the scattered field are summarized. When combined with a diversity reception communication analysis, these solutions imply that a large performance gain over nondiversity reception can be achieved if adaptive coherent combining can successfully be employed. Although this gain does not require multiple receiver sites, it does entail a transmission bandwidth reduction. View full abstract»

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  • Route Diversity Effect on 20 GHz Band Radio Relay Links

    Publication Year: 1983 , Page(s): 680 - 685
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    Rain outage performance on route diversity systems, necessary for the circuit design of millimeter communication systems, is examined by comparing it to that of a tandem system. The analysis is mainly based on the attenuation data measured over about two and a half years at the 20 GHz band on 13 tandem links near Tokyo. It is shown that the joint probability of rain attenuation on two paths can be expressed as a function of the path correlation coefficient on the two paths under consideration, and the evaluation of the rain outage performance can be approximated by the joint probability on pair hops of a diversity route. An estimation method using the path length enlargement effect is proposed for the estimation of the route diversity improvement. View full abstract»

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  • Radio Local Distribution System for High-Speed Digital Communications

    Publication Year: 1983 , Page(s): 609 - 615
    Cited by:  Papers (7)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    The radio local distribution system (RLDS) has been proposed to transmit various business information signals. The proposed RLDS uses a 26 GHz band and time division multiple access (TDMA). The main features of the RLDS are the use of radio equipment containing the microwave integrated circuit (MIC) and the adoption of the demand-assigned TDMA (DA/TDMA) technique. The MIC is more suitable than conventional waveguide circuits for mass production because its components are miniaturized. The DA/TDMA system, operating in a fully variable demand-assignment mode, uses simple control systems with a low bit rate. As a result, the RLDS can serve a local distribution system of high-speed digital communications both expeditiously and economically. View full abstract»

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  • Millimeter Wave Antenna Technology

    Publication Year: 1983 , Page(s): 633 - 644
    Cited by:  Papers (1)
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    Millimeter wave antenna technology has had a long history of development, and as millimeter wave systems evolve through planning to implementation, a significant amount of additional development work will be required. Millimeter wave antennas play a key role in the rationale for millimeter system designs because high spatial resolution can be achieved with modest physical dimensions. Reflector, lens, array, and horn technologies are surveyed. Multiple beam designs and adaptive processing antennas are described because these technologies afford high leverage opportunities to enhance electronic survivability and to extend communication capabilities. Ancillary components, such as radomes, are a necessary part of practical antenna designs and are discussed in some detail. View full abstract»

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  • TDMA Site Diversity Switching Experiments with Japanese CS

    Publication Year: 1983 , Page(s): 674 - 680
    Cited by:  Papers (4)
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    A site diversity switching experiment system for satellite earth links adopting PCM/PSK/TDMA is introduced. Results of downlink switching experiments using CS (30/20 GHz) are presented. Investigations of measuring time of signal quality for minimizing the diversity. switching error are made in point of Allan variance of bit error rate (BER) and of the defined switching error rate. View full abstract»

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  • Millimeter Wave Subscriber Loops

    Publication Year: 1983 , Page(s): 623 - 632
    Cited by:  Papers (6)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB)  

    Advantages and drawbacks of using millimeter waves in the telephone and data subscriber distribution network are listed. Fields in which it seems attractive to use millimeter wave loops are examined. For such applications, cost and reliability constraints led to the design of very simple systems. Two systems will soon be introduced into the French subscriber plant. The first one will be commissioned in 1983 to connect groups of remote subscribers, working at 31 GHz, using a homodyne millimetric front end. The second one, still under experiment, is designed for the connection of subscribers of the integrated service communication network; working at 23 GHz, it uses time-division multiplexing to assume duplex operation. The most drastic constraint when setting up such systems is the line-of-sight requirement. Investigations of that problem, using computer-aided coverage map plotting are discussed. View full abstract»

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  • Propagation Tests for 23 GHz and 40 GHz

    Publication Year: 1983 , Page(s): 658 - 673
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1008 KB)  

    Propagation tests were conducted on the 23 GHz and 40 GHz bands on the same 1.08 km path in Nagoya City, Japan, for two years (1979 and 1980), in order to collect circuit design data for a highly reliable millimeter wave intracity communication link. The path attenuation versus 1 min rain rate relation for the same cumulative percentage of time was obtained and compared to the theoretical curves of various raindrop distributions such as Laws and Parsons. We found some discrepancies on both the high rain rates, exceeding 50 mm/h, and low rain rates. The former was thought to be due to a mismatch between the rain gauge integration time and the path attenuation time constant. From the coincidence of the autocorrelation functions of both the rain rate and path attenuation, we were able to determine the best fit integration time. The latter was due to the loss of the radome in the rain. The circuit outage of the short path millimeter wave radio link was strongly affected by the heavy rains which exceeded 60 or 100 mm/h in thunderstorms, fronts, and typhoons, and was characterized by bursts of rain. Based on the 1 min rain rate records for five years, 1975-1979, we found the heavy rain statistics obeyed Poisson's distribution. Finally, we introduced a propagation test of 40 GHz through fire flames and found the losses to be low. View full abstract»

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Aims & Scope

IEEE Journal on Selected Areas in Communications focuses on all telecommunications, including telephone, telegraphy, facsimile, and point-to-point television, by electromagnetic propagation.

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Editor-in-Chief
Muriel Médard
MIT