By Topic

1995 Sixth International Conference on Radio Receivers and Associated Systems

26-27 Sep 1995

Filter Results

Displaying Results 1 - 25 of 45
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Identification of PSK signals

    Publication Year: 1995, Page(s):95 - 99
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    PSK signals may be identified using decision theoretic techniques. The paper compares the performance of the optimum, the statistical moments, the DFT and the maximum likelihood DFT classifiers. The robustness of each classifier is examined for the effects of symbol imbalance due to a finite signal time frame, error in the SNR estimate, channel filtering and phase error. Simulation results are pre... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Osman Nuri Ucan (ONU) receivers in partial response channels

    Publication Year: 1995, Page(s):198 - 202
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    In this paper, for the first time in literature trellis coded M-PSK modulated signals are analysed in partial response channels and the Osman Nuri Ucan (ONU)-receiver is introduced. The ONU-receiver is composed of a k unit memory decoder, k/k+1 rated convolutional encoder, cascaded with a PRS channel model. The combined trellis structure of the ONU-receiver reduces the state number from 2... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis and topologies for high efficiency amplifiers based on RF synthesis

    Publication Year: 1995, Page(s):212 - 217
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    The paper outlines the most theoretical and simulation studies undertaken on the Combined Analogue Locked Loop Universal Modulator (CALLUM) used to achieve very high efficiency linear RF power amplification. The results given define the performance bounds of the CALLUM technique and demonstrate its application in portable radio designs for cellular and private mobile radio networks View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An analysis of IF filter effects in bandpass sampling digital demodulators

    Publication Year: 1995, Page(s):57 - 61
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents a method for the analysis of the performance of digital demodulators which use bandpass sampling (BPS) to perform both signal spectral shifting and, noise and spurious signal suppression. The bandpass sampling technique can simplify the front-end processing of a digital receiver by eliminating RF downconversion stages. In addition, as the signal is sampled prior to downconversi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A 5 kHz channelling VHF linear modulation receiver for volume production

    Publication Year: 1995, Page(s):6 - 10
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    Increased demand for spectrum has led the regulatory authorities to encourage the adoption of voice and data systems using 5 kHz channelling. In the USA, 200 duplex channels in the 220 to 222 MHz band released by the FCC are now in use. In the UK, a regulatory specification is published by the Radiocommunications Agency and trials have been carried out in the 70 MHz, 160 MHz and 220 MHz bands. Man... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.