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Communications, IEEE Transactions on

Issue 10 • Date October 1982

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Displaying Results 1 - 25 of 29
  • [Front cover and table of contents]

    Publication Year: 1982 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (248 KB)  
    Freely Available from IEEE
  • Guest Editorial: Special Issue on Phase-Locked Loops

    Publication Year: 1982 , Page(s): 2221 - 2223
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | PDF file iconPDF (373 KB)  
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1982 , Page(s): 0
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    Freely Available from IEEE
  • Phase-Locked Loop Performance in the Presence of CW Interference and Additive Noise

    Publication Year: 1982 , Page(s): 2305 - 2311
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (472 KB)  

    This paper presents the results of an investigation concerning the performance degradation of a phase-locked loop (PLL) due to continuous wave (CW) interference and additive white Gaussian noise. The performance measures evaluated include the probability density function (pdf) of phase error and the cycleslipping rate. The measures are characterized in terms of the ratio of interference to the des... View full abstract»

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  • Phase Error Statistics in Costas Loops Due to Channel Distortion and Noise

    Publication Year: 1982 , Page(s): 2264 - 2270
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    This paper treats the problem of phase recovery loop performance loss due to a nonideal RF channel. The linear channel under consideration is assumed to suffer from a variety of impairments such as bandwidth limitation, hardware imperfections, and asymmetry of its transfer function. The phase error probability density function of a first-order Costas loop is presented. It has been determined that ... View full abstract»

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  • Equivocation as a Cause of PLL Hangup

    Publication Year: 1982 , Page(s): 2242 - 2243
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB)  

    The role of phase equivocation in hangup of phase-lock loops is clarified. Equivocation can occur and lead to hangup if and only if the phase detector characteristic is discontinuous at the reverse-slope null. View full abstract»

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  • Error-Signal Response of a Phase-Locked Loop to a Coherent Chirp Signal

    Publication Year: 1982 , Page(s): 2274 - 2276
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (256 KB)  

    A new theory which describes the transient response of a PLL to a periodic ramp voltage applied to the VCO for generating a coherent chirp signal has been presented. With the appropriate choice of loop parameters and the ramp voltage rate to make the value of the normalized loop natural frequency within the range (0, 1), the PLL's equation can be simplified to a nearly linear differential equation... View full abstract»

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  • Phase-Locked Loops with Limiter Phase Detectors in the Presence of Noise

    Publication Year: 1982 , Page(s): 2297 - 2304
    Cited by:  Papers (39)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (608 KB)  

    A nonlinear mathematical model of phase-locked loops with limiter phase detectors in the presence of noise is presented. The model, which is an extension of the well-known baseband model of loops with sinusoidal phase detectors without limiters, incorporates a modified nonlinear phase detector characteristic, the form of which is changed if the input carrier-to-noise ratio alters, as well as a mod... View full abstract»

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  • Tracking-Loop Bias Due to Costas Loop Arm Filter Imbalance

    Publication Year: 1982 , Page(s): 2271 - 2273
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    An expression is derived which shows that when the bandpass filter preceding a Costas loop is not symmetric and the arm filters are not balanced, a static phase error, which becomes larger as the SNR decreases, can occur due to noise. Conversely, if either condition does not apply, then no noise-induced phase error bias will exist. It is shown, for a modified Costas loop in which one arm filter is... View full abstract»

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  • Linear Phase-Locked Loop Theory for Cyclostationary Input Disturbances

    Publication Year: 1982 , Page(s): 2253 - 2259
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (600 KB)  

    This paper presents a general method for evaluating the linearized tracking performance of phase-locked loops (PLL's) estimating the phase of an unmodulated sinusoid corrupted by an additive disturbance which is described in terms of cyclostationary processes. Such disturbances are frequently encountered in carrier modulated systems where the sidebands are responsible for the error in estimating t... View full abstract»

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  • Suboptimal Maximum Likelihood Timing Estimator for a PCM Regenerative Repeater

    Publication Year: 1982 , Page(s): 2376 - 2384
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1064 KB)  

    This paper introduces a modified likelihood function and then provides the suboptimal maximum likelihood (SML) timing estimator which is applicable to PCM regenerative repeaters because of its structural simplicity. Since the SML timing estimator tracks a difference waveform balancing point, as opposed to its conventional maximum likelihood (ML) counterpart, which tracks a derivative waveform zero... View full abstract»

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  • Phase Accuracy of Charge Pump PLL's

    Publication Year: 1982 , Page(s): 2362 - 2363
    Cited by:  Papers (18)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB)  

    Phase-lock loops using charge pumps are found to have remarkably good potential for accurate phase tracking. The several favorable factors are described and numerical calculations provide examples of typical errors. Inaccuracy as small as fractional microcycles appears to be an attainable goal. View full abstract»

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  • False-Lock Performance Improvement in Costas Loops

    Publication Year: 1982 , Page(s): 2285 - 2288
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (312 KB)  

    A technique is described to reduce the probability of false-lock in Costas loops. This is where a frequency offset arises at a multiple of half the incoming data rate due to finite bandwidth of the arm filters. A modification is described to process components of this offset so as to augment the feedback control voltage. The performance is analyzed and it is shown how certain false-lock positions ... View full abstract»

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  • Phase Synchronization Systems Studies

    Publication Year: 1982 , Page(s): 2260 - 2263
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (376 KB)  

    The methods of Studies of phase-locked systems are reviewed. Main attention is paid to the methods of investigation of the stability and dynamics of the second-order phase-locked loop and the effect of fluctuation interference on it. View full abstract»

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  • All-Pole Phase-Locked Tracking Filters

    Publication Year: 1982 , Page(s): 2312 - 2318
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (632 KB)  

    This paper describes the design and synthesis of second-, third-, and fourth-order all-pole, phase-locked tracking filters for those applications in which the signal-to-noise ratio is large. Higher order transfer functions are also realizable as a cascade of these basic structures. Using cataloged analog filter data allows the phase-locked loop to be designed so that its transfer function and asso... View full abstract»

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  • Phase-Locked Loops Used with Masers: Atomic Frequency Standards

    Publication Year: 1982 , Page(s): 2355 - 2361
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (696 KB)  

    Active atomic frequency standards, such as hydrogen and rubidium masers, are characterized by a very good frequency stability. However, they deliver a signal at a power level and at a frequency that are not practical to the users. This paper describes the techniques used to phase-lock to those masers a standard crystal oscillator at a cardinal frequency. A review of the various systems realized up... View full abstract»

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  • Performance Analysis of Digital Tanlock Loop

    Publication Year: 1982 , Page(s): 2398 - 2411
    Cited by:  Papers (41)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1096 KB)  

    In this paper, a nonuniform-sampling digital phaselocked loop (DPLL) called the digital tanlock loop (DTL), which uses a new type of phase error detector with linear phase characteristic, is studied. The main feature of the DTL is that the phase error detector, using the \tan^{-1}(.) function with in-phase and quadrature samples of the incoming signal, has a... View full abstract»

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  • Cycle Slips in Phase-Locked Loops: A Tutorial Survey

    Publication Year: 1982 , Page(s): 2228 - 2241
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1272 KB)  

    Cycle slips in phase-locked loops are statistical, nonlinear phenomena. This makes a mathematical analysis extremely difficult. As a consequence, the results of such an analysis are not easily accessible to the practicing engineer. It is the purpose of this survey paper to present a self-contained discussion of cycle slips in phase-locked loop avoiding advanced mathematical tools. Based on the res... View full abstract»

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  • Performance Measures for Phase-Locked Loops--A Tutorial

    Publication Year: 1982 , Page(s): 2224 - 2227
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    This paper discusses the principle of operation of a phaselocked loop using a vector diagram approach. From this diagram the acquisition, tracking, and frequency stability performance measures are introduced without the need of a loop mathematical model and associated loop analysis. Designers of phase-lock technology should find this tutorial discussion useful in understanding and writing specific... View full abstract»

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  • A Generalized "Polarity-Type" Costas Loop for Tracking MPSK Signals

    Publication Year: 1982 , Page(s): 2289 - 2296
    Cited by:  Papers (10)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (552 KB)  

    A generalized tracking loop is proposed for tracking MPSK signals at high SNR. It is similar in form to the polarity-type Costas loop used for tracking QPSK signals, in which limiters in the arms provide the data estimates needed for data wipeoff in forming the loop error signal. For the MPSK signal, the hard limiters are replaced by "multivalued limiters" with View full abstract»

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  • Improved Acquisition in Phase-Locked Loops with Sawtooth Phase Detectors

    Publication Year: 1982 , Page(s): 2364 - 2375
    Cited by:  Papers (5)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (976 KB)  

    Phase-locked loops are frequently used to estimate bit timing in baseband digital transmission systems. The investigation reported here examines the applicability of a frequency-sensitive phase detector to timing estimation of randomized data. A new edge-triggered sawtooth phase detector is described. The reduced magnitude of circuit-induced imperfections made possible by the new detector, in conj... View full abstract»

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  • Noise and False-Lock Performance of the PSK-Tanlock Loop

    Publication Year: 1982 , Page(s): 2277 - 2284
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (800 KB)  

    The tanlock modification of the phase detector characteristics of a phase-lock loop can be used to increase the linear range of operation of the S-curve of an analog loop, hence increasing the tracking and acquisition ranges without increasing the loop gain. The phase-shift-keying tanlock loop is a realization of this modification for the coherent demodulation and tracking of a PSK suppressed carr... View full abstract»

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  • Application of Phase-Locked Oscillator for PCM Network Synchronization

    Publication Year: 1982 , Page(s): 2344 - 2354
    Cited by:  Papers (4)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (872 KB)  

    In PCM integrated communication systems in which PCM telephone signals are transmitted and switched in an integrated manner, the clock frequency of the PCM signals in the whole network must be synchronized. Mutual synchronization was proposed for this purpose. This is an important application of a phase-locked oscillator. By interconnecting two phase-locked oscillators to control each other, the f... View full abstract»

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  • Elimination of False-Locking in Long Loop Phase-Locked Receivers

    Publication Year: 1982 , Page(s): 2391 - 2397
    Cited by:  Papers (5)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (600 KB)  

    Although long-loop phase-locked techniques are finding increasing application in the fields of mobile radio and satellite communications, their use has several drawbacks. Time delay associated with filtering processes within the loop gives rise to a degradation in acquisition capability, and information components entering the control loop cause a reduction in adjacent channel performance. In this... View full abstract»

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  • Phase-Locked Loop Coherent Combiners for Phased Array Sensor Systems

    Publication Year: 1982 , Page(s): 2329 - 2340
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1064 KB)  

    Phase-locked loops (PLL's) may be used to implement signal combiners which coherently sum multiple signals from an array of sensors. In each combiner channel, the sensor signal is simultaneously downconverted to an intermediate frequency (IF) signal and phase-locked to an appropriately generated reference signal by a "long-loop" PLL. This loop maintains a nominal 90° phase difference between ... View full abstract»

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Aims & Scope

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

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Robert Schober
University of British Columbia