1995 Sixth International Conference on Radio Receivers and Associated Systems

26-27 Sep 1995

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Displaying Results 1 - 25 of 45
  • Detecting and identifying spurious signals generated in radar receivers

    Publication Year: 1995, Page(s):119 - 122
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    HF radar receivers require the suppression of inherent spurious signals (spurii) far below the IEC specified level. Measurements of the appropriate sensitivity are often thwarted by spurii originating in test equipment, making it difficult to identify those spurii which originate in the receiver. A technique is proposed which allows spurii generated from harmonics of the tuned local oscillator to ... View full abstract»

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  • A high-performance 1 GHz surface transverse wave based receiver for hand-held personal communications

    Publication Year: 1995, Page(s):76 - 80
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    This paper describes a compact, efficient and highly sensitive 1 GHz superheterodyne receiver which can track, receive and detect frequency modulation (FM), and frequency shift keying (FSK) signals with a modulation bandwidth of 200 kHz and a sensitivity threshold of 500 nV. The tracking bandwidth of 500 kHz allows reliable operation over the temperature range of (-30...+60) deg. C. The receiver c... View full abstract»

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  • Improvements to the analysis-by-synthesis loop in CELP codecs

    Publication Year: 1995, Page(s):114 - 118
    Cited by:  Papers (1)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    In this paper extensions to the analysis-by-synthesis (AbS) loop used in code excited linear predictive (CELP) speech codecs are considered. Methods for updating the short-term synthesis filter once the excitation parameters have been determined are examined. We show that significant improvements can be achieved by updating the synthesis filter, similar to those obtained using the well known metho... View full abstract»

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  • Spread spectrum signal detection using a cross correlation receiver

    Publication Year: 1995, Page(s):42 - 46
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    A technique is presented for the detection of very low power spread spectrum signals with high resolution direction finding, by cross correlating the outputs of two spatially separated receivers and forming the “time domain filtered cross spectral density” (TDFCSD). Detection is achieved by threshold detection within the amplitude of this TDFCSD, while direction finding is achieved by ... View full abstract»

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  • Linear wideband receiver system

    Publication Year: 1995, Page(s):71 - 75
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    A receiver system is presented that has the desirable features required for high dynamic range matched receivers suitable for operation in different systems in the high frequency range. The paper discusses the fastest sampling rates available consistent with a high dynamic range View full abstract»

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  • Proceedings of 6th International Conference on Radio Receivers and Associated Systems (Conf. Publ. No.415)

    Publication Year: 1995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    The following topics were dealt with: receiver architectures; equipment characterisation; antennas; HF receivers; system issues; receiver subsystems View full abstract»

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  • Repeaters in PCN and mobile cellular networks

    Publication Year: 1995, Page(s):154 - 157
    Cited by:  Papers (1)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    Repeater implementations need to be tailored to the environment in which they are deployed. The operation of two types of repeater, indoor and outdoor, is illustrated through the use of operating scenarios in order to define performance limits and equipment requirements. The results of trials of such repeaters in Mercury One-2-One network is then provided View full abstract»

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  • RF transformers considered as transmission line devices

    Publication Year: 1995, Page(s):109 - 113
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    The lumped element circuit model for broad-band transformers has been in use for at least 50 years. It was developed for audio frequency transformers. Unfortunately, it ceases to give accurate results when the length of the windings becomes significant with respect to the signal wavelength. This is the case in RF broad-band transformers. For these, a model based on transmission lines is proposed. ... View full abstract»

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  • Channel-adaptive modulation

    Publication Year: 1995, Page(s):144 - 147
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    Packet reservation multiple access (PRMA) assisted adaptive modulation using 1, 2 and 4 bit/symbol transmissions is proposed as an alternative to dynamic channel allocation (DCA) in order to maximise the number of users supported in a traffic cell. The cell is divided in three concentric rings and in the central high signal-to-noise ratio (SNR) region 16-level star quadrature amplitude modulation ... View full abstract»

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  • Loran-C skywave detection using rational modelling techniques

    Publication Year: 1995, Page(s):100 - 104
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    The autoregressive moving average (ARMA) spectral analysis technique is applied to the problem of estimating the delay of skywaves in Loran-C radionavigation receivers. This establishes a basis on which to design a receiver capable of adjusting its sampling points adaptively to the optimal values in a constantly-changing skywave environment. Such receivers offer the prospect of significantly impro... View full abstract»

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  • Mean time to lose lock for a coherent extended tracking range delay-locked loop

    Publication Year: 1995, Page(s):176 - 180
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The delay-locked loop (DLL) is an appropriate device to guarantee fine synchronization for direct-sequence spread spectrum systems. The mean time to lose lock (MTLL) is a good performance criteria for the DLL operating at low signal to noise ratios. In the paper, the influence of the extended tracking range on the MTLL for a coherent DLL is investigated. A second order loop with passive loop filte... View full abstract»

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  • Performance assessment of receivers used in HF radar

    Publication Year: 1995, Page(s):133 - 138
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    The High Frequency Radar Division of the Australian Defence Science and Technology Organisation has developed an automated HF receiver testing station which can perform exhaustive testing and assessment of multiple performance modes of radio and radar receivers as well as other HF and VHF components and systems. The system developed has the capability of performing detailed examination of a receiv... View full abstract»

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  • An antenna correlation measuring receiver

    Publication Year: 1995, Page(s):91 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB)

    The paper presents a simple antenna correlation measuring receiver that is capable of measuring the complex cross-correlation of the signals produced by two receiving antennas connected to it. To measure complex correlation, information about the amplitude and phase of each signal is required. Synchronous phase measurement dictates that highly phase-stable oscillators and signal generators are use... View full abstract»

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  • A cooled UHF receiving system for radio astronomy

    Publication Year: 1995, Page(s):168 - 171
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    The 250 ft (76 m) Lovell radio telescope at Jodrell Bank has been a familiar feature on the Cheshire landscape for nearly forty years and throughout this time it has been a scientific instrument of tremendous value in radio astronomy research. This includes spectral line observations (allowing scientists to investigate the chemistry of the Universe), mapping of distant objects (up to the edge of t... View full abstract»

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  • A high performance CDMA cellular radio system based on low-rate convolutional coding

    Publication Year: 1995, Page(s):17 - 21
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The field of spread spectrum multiple access is currently receiving considerable attention as a contender for the next generation mobile telephone system. In comparison to advanced time-division multiple access (TDMA) techniques, direct-sequence code-division multiple-access (DS-CDMA) spread-spectrum systems offer increased flexibility in the frequency management of the cellular network, the prosp... View full abstract»

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  • Comparative study of pilot symbol assisted modem schemes

    Publication Year: 1995, Page(s):36 - 41
    Cited by:  Papers (18)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    The performance of a range of 1, 2 and 4 bit/symbol pilot symbol assisted modulation (PSAM) arrangements employing first-order linear, low pass, polynomial and optimum higher-order linear interpolation schemes is analysed in contrast to that of the equivalent non-coherent modems. Both the non-coherent modems as well as the coherent PSAM schemes exhibited a residual bit error rate (BER), but the be... View full abstract»

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  • A low power consumption receiver at LF using frequency shift keying technique

    Publication Year: 1995, Page(s):67 - 70
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    A low cost, compact, low power receiver has been designed and implemented. The frequency of operation was chosen to be 176 kHz. The modulation method was frequency shift keying. In the design, no bulky inductor was employed View full abstract»

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  • Optical technique for identification and decoding of digitally modulated signals in surveillance receivers

    Publication Year: 1995, Page(s):203 - 207
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    An acousto-optic technique for identifying and decoding various unknown types of digitally modulated signals is described. The performance of the system, which uses a bicell photodiode detector assembly, is modelled. It is shown that the output of the system, which consists of the sum and difference of the signals from the two bicell elements, is different and easily identifiable for each of the f... View full abstract»

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  • An HF DSP based frequency management system

    Publication Year: 1995, Page(s):123 - 127
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The requirement to optimise the operation of a high frequency (HF is 2 to 30 MHz) communication link is primarily a function of two main factors; (i) the varying nature of the HF medium causes the need to regularly monitor the operation of high performance links, and (ii) the allocated available spectrum to be utilised with greater efficiency. In response to this challenge, adaptive HF systems hav... View full abstract»

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  • Application of zero-IF radio architecture to multistandard compatible radio systems

    Publication Year: 1995, Page(s):81 - 85
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    This paper covers the results of the radio architecture studies towards common multistandard compatible radio front-ends carried out within the RACE Project 2123 GIRAFE (Gigahertz Radio Front Ends) which is a research project in the area of mobile telecommunications focused on the application of advanced microelectronics integration and packaging techniques for RF components to be used in terminal... View full abstract»

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  • Digital HF receiver

    Publication Year: 1995, Page(s):47 - 51
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    The paper describes an experimental digital receiver (tuner) for wideband applications in the HF-band. The output from the receiver is an undemodulated digitised signal with 750 kHz of useful bandwidth. The 5 MHz sampling frequency is generous compared to the bandwidth. This relaxes the demands on the analogue components and gives us the possibility of using baseband sampling without introducing a... View full abstract»

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  • Evolution of radio systems into the 21st century

    Publication Year: 1995, Page(s):1 - 5
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    Progress in the development and application of radio communications over the past century, from initial discoveries to mass markets has been both rapid and profound. As we approach the second century of radio this paper explores the possible evolution of radio systems in the coming years. In considering future evolution of radio systems we should recognise the enormous potential of radio systems t... View full abstract»

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  • Where is the thrust in the cellular telephony?

    Publication Year: 1995, Page(s):158 - 162
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper presents an overview of wireless telephony. The key points relating to different markets are analyzed: their size, customer needs, coming changes etc. Next the evolution of analogue and digital cellular systems is described and also the different skills that are needed to create a multinational cellular service are listed. The conclusion is that while wireless telephony is becoming a re... View full abstract»

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  • A novel data-rate adaptation approach for meteor burst communications: direct-sequence spread-spectrum modulation

    Publication Year: 1995, Page(s):148 - 153
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    There are a number of basic approaches to implementing a variable data-rate modem. A meteor burst communication channel can be fully exploited during an adaptive data-rate operation. In adaptive data-rate operation, the actual data-rate is matched to the instantaneous power received from a meteor trail. This paper theoretically investigates the benefit of such an operation and introduces a new met... View full abstract»

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  • A modular testbed for automatic channel selection, link establishment and maintenance

    Publication Year: 1995, Page(s):105 - 108
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The paper describes the development of a testbed radio system for automatic channel selection (ACS), automatic link establishment (ALE) and automatic link maintenance (ALM) techniques. As HF radio systems become more automated, the concept of ALE has evolved to describe the start-up phase of communications. ALE involves the co-ordination of channel encoding and decoding, encryption and decryption,... View full abstract»

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