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1995 Sixth International Conference on Radio Receivers and Associated Systems

26-27 Sep 1995

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Displaying Results 1 - 25 of 45
  • 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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  • 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 new diversity code for high spectrum occupancy applications

    Publication Year: 1995, Page(s):139 - 143
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    The resurgent use of HF, the increase in VHF/UHF usage and in particular the employment of data transmission has meant that the newer enabling technologies such as digital signal processing (DSP) have found a fertile ground in these mature electronic technologies. The main reason is the ability of DSP to overcome the problems that have dogged earlier users. For example, adaptive modem techniques h... View full abstract»

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  • Performance of a multi-carrier code division multiple access frequency domain RAKE receiver

    Publication Year: 1995, Page(s):86 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    A multi-carrier code division multiple access system with a frequency domain RAKE receiver is described. We compare multi-carrier and direct sequence CDMA systems using frequency and time domain RAKE receivers in the downlink of a mobile cellular system. No guard interval or interleaving is used in our multi-carrier system and in this way the multi-carrier and direct sequence systems occupy the sa... 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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  • 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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  • HF radar receiving system image rejection requirements

    Publication Year: 1995, Page(s):128 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (776 KB)

    The sensitivity and consequent detection capability of an HF radar employing a superheterodyne receiving system may be compromised by spurious signals arising from inadequate receiver image rejection characteristics. The image rejection phenomenon arises due to the fact that in addition to the intended action of a mixer in translating a wanted signal from its input frequency to an intermediate fre... 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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  • 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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  • 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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  • 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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  • 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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  • Comparative study of pilot symbol assisted modem schemes

    Publication Year: 1995, Page(s):36 - 41
    Cited by:  Papers (16)  |  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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  • The acquisition performance of delay-lock loops in noise

    Publication Year: 1995, Page(s):192 - 197
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    Describes results of a computer simulation of a re-configurable delay-lock loop (DLL) which allows fast acquisition of code synchronisation in very poor input SNR conditions. The DLL is based on an analogue prototype but is implemented digitally and this allows the loop to be switched very easily from a noncoherent configuration during initial acquisition to a coherent loop after code, carrier and... 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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  • In-band channel sounding in operative cells for mobile and wireless communications

    Publication Year: 1995, Page(s):31 - 35
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper presents an analysis of the swept time delay crosscorrelator, as used in wideband, RF, channel sounding systems, with a view to examining its use in already occupied channels. It is shown that the probe signal can be selectively filtered at the transmitter and receiver to minimise interference to users within the band. This filtering degrades the dynamic range of the sounder and hence 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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  • Technology Foresight and future trends in radio

    Publication Year: 1995, Page(s):62 - 66
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The Technology Foresight programme was announced in the 1993 White Paper `Realising Our Potential' on science, engineering and technology. It brings together industrialists and scientists from private enterprise, the Universities, and Government. The objective is to consider how the UK can best take advantage of the markets and technologies likely to emerge during the next 10-20 years, and identif... View full abstract»

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  • Linearised transceivers for mobile communications base stations using adaptive array antennas

    Publication Year: 1995, Page(s):208 - 211
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    With the increased demand on higher capacity and better services from mobile communications networks, the rise of an adaptive antenna in mobile communications base stations is seen as inevitable. This technique has the potential of increased spectrum efficiency, extended range of coverage and higher data throughput. It has presented an incentive to further investigate hardware aspects in the reali... View full abstract»

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  • An integrated active transponder for ISM-band applications

    Publication Year: 1995, Page(s):172 - 175
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    The paper describes a multifunction GaAs MMIC dedicated to ISM-band short range microwave link application. The chip was designed to satisfy the typical transponder system specifications and to be easily adaptable to different transponder architectures. Experimental results are reported and discussed View full abstract»

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  • An adaptive decision feedback equalizer with shaped training for mobile communication FM receivers

    Publication Year: 1995, Page(s):185 - 191
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The paper describes an adaptive equalizer suitable for digital wireless systems. These systems are normally defined to work in indoor environments where channels show low delay spread values. For this reason, the possibility of signal equalization is not usually taken into account. Moreover, simplicity and cost are important parameters for these systems, and therefore simple and inexpensive receiv... 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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  • EMC issues relating to the design of communicating appliances

    Publication Year: 1995, Page(s):26 - 30
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    There has been a rapid growth in the use of mobile communications with the emergence of digital radio technologies. In parallel with this PDAs (Personal Digital Assistants) are now starting to enter the market place. The development of commercial products combining both digital electronics and RF (radio frequency) circuits gives rise to some important EMC (electromagnetic compatibility) challenges... View full abstract»

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