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IEEE Transactions on Communication Technology

Issue 4 • Date August 1967

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

    Publication Year: 1967, Page(s): 0
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    Freely Available from IEEE
  • A Sequential Decoding Technique and Its Realization in the Lincoln Experimental Terminal

    Publication Year: 1967, Page(s):477 - 491
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1699 KB)

    Probabilistic codes when suitably matched to modulation-demodulation systems allow communications which realize the theoretical performance predicted by the coding theorem. Sequential decoding is a form of probabilistic coding which allows realization in practical equipment to achieve this end. The Lincoln Experimental Terminal (LET) uses convolutional encoding and sequential decoding matched to a... View full abstract»

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  • Sequential decoding for efficient communication from deep space

    Publication Year: 1967, Page(s):492 - 501
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    A system based on sequential decoding and utilizing binary phase-shift keying and 8-level quantized decisions is proposed for deep-space communication. Theoretical analyses augmented by a program of computer Simulation promise operation within 3-4 dB of the channel capacity of an infinite bandwidth additive white Gaussian noise channel. A low probability of erasure is achieved by the suggested use... View full abstract»

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  • A Method for Calculating Phase-Locked Loop Performance Near Threshold

    Publication Year: 1967, Page(s):502 - 506
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Although several methods have evolved over the past few years for analyzing the near-threshold behavior of phaselocked devices, none so far have been able conveniently to integrate all desirable aspects of an engineering method which requires both accuracy and simplicity of formulation. This paper contains a method conceptually as simple as the linear and quasi-linear techniques, but with the adde... View full abstract»

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  • Error Rates for Digital Signals Demodulated by an FM Discriminator

    Publication Year: 1967, Page(s):507 - 517
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    The calculation of the error rate resulting from the detection of binary frequency shift keyed (FSK) signals using an FM discriminator low-pass filter detector is described. An example is given using an alternating mark space sequence and the results compared with those obtained using a matched filter. The results indicate that in certain regions the FM discriminator low-pass filter detector yield... View full abstract»

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  • Frequency Locked Loop FM Demodulator

    Publication Year: 1967, Page(s):518 - 524
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    A new type of FM demodulator, the Frequency Locked Loop (FLL) is presented. The concept employed in this class of circuits is shown to be applicable in two forms. The first form is realized at the carrier, or IF frequency, to provide an FM detector that has the properties of not requiring a limiter preceding it and also of having a threshold superior to a normal FM discriminator limiter combinatio... View full abstract»

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  • Design of Block-Coded Communication Systems

    Publication Year: 1967, Page(s):525 - 534
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (757 KB)

    The design and performance of frequency multiplexed, phase-modulated communication systems is presented. In particular, the transmitter is assumed to be an ideal phase modulator which modulates a RF carrier with N phase-modulated, sinusoidal data subcarriers, and in general, M binary-valued composite signals. The receiver is... View full abstract»

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  • Optimum Nonlinear Scalar Transmitters and Receivers

    Publication Year: 1967, Page(s):535 - 542
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Optimum designs are obtained for a receiver for processing scalar signals embedded in noise, a scalar transmitter in a given noise environment, and a scalar transmitter for combating noise and crosstalk. An iteration algorithm is given for determining the best combination of transmitter and receiver to combat noise; an approximate best combination is calculated in the small noise case. View full abstract»

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  • The Reduction of Systematic Jitter in a Transmission Chain with Digital Regenerators

    Publication Year: 1967, Page(s):542 - 551
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (956 KB)

    This paper describes methods for the reduction of jitter in transmission chains with regenerative repeaters. These methods are based on the application of pattern transformations to the output signals of successive repeaters. As a result, the coherent accumulation of jitter from signal dependent jitter sources is prevented. Instead, the jitter accumulates on a power basis. It is shown that in this... View full abstract»

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  • Observations on the Effects of Pulse Noise in Digital Data Transmission Systems

    Publication Year: 1967, Page(s):552 - 556
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    This paper presents some observations concerning the type of variability one might encounter in determining error rates in digital data transmission systems subjected to impulse noise. The effects of pulse shape and duration are investigated. It is shown that for signal-to-noise ratios (SNR) greater than -5 dB, a variation of 8 to 1 in the average number of errors per pulse might be encountered as... View full abstract»

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  • Intermodulation Noise of FDM-FM Communications Through a Hard Limiter

    Publication Year: 1967, Page(s):557 - 565
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (838 KB)

    When the multiple signals of FDM-FM communications are passed through a hard limiter, intermodulation products are generated which cause baseband noise. A technique is presented, implemented by a computer program, of explicitly determining this baseband noise as a function of the system parameters of frequency ratio, frequency deviation, and carrier magnitudes. Results are presented as a function ... View full abstract»

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  • Wideband Troposcatter Radio Channel Simulator

    Publication Year: 1967, Page(s):565 - 570
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    A versatile troposcatter simulator has been built which can produce radio channels exhibiting frequency fiat or frequency selective fading over a band greater than l0 MHz and centered at 70 MHz. Frequency selective channels with Rayleigh or other fading are available with controllable cross-correlation of the multipath components. In addition, multiple diversity channels with controllable cross-co... View full abstract»

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  • A 160-Watt Experimental Thermoelectric Power Plant for Telephone Microwave Equipment

    Publication Year: 1967, Page(s):571 - 578
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1061 KB)

    A field experiment is described which has operated since July, 1964, using commercially available thermoelectric generators to provide power to a transmitter-receiver bay of telephone microwave equipment. The generators are operated at a nominal power level of 160 watts. The purpose of the experiment is to gain experience with thermoelectric generators operating under actual field conditions and t... View full abstract»

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  • Use of Commercial Broadcast Stations for Emergency DOD Communications

    Publication Year: 1967, Page(s):579 - 592
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    This work proves the feasibility of utilizing commercial broadcast facilities for emergency Department of Defense 100 wpm Teletype communications. The test network, which consists of ten stations, extends over the northeastern United States. Teletype communications is accomplished by frequency shifting the carrier of the broadcast station transmitter ±18 Hz. This submodulation technique cause... View full abstract»

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  • Measurement of the Phase Constant for Rock Propagated Radio Signals

    Publication Year: 1967, Page(s):592 - 597
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (641 KB)

    A method is described for determining the phase constant of the rock medium below the surface of the earth. The constant is deduced from the measured phase angle of the mutual impedance between two vertically polarized antennas placed in drill holes extending into the rock. Experiments were conducted at Cape Cod, Mass., using the method to determine the phase constant of the rock between two 1000-... View full abstract»

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  • Excitation of Higher-Order Antenna Modes by Multipath Propagation

    Publication Year: 1967, Page(s):597 - 603
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Deep fading on microwave line-of-sight radio relay links is known to be caused by two or more rays arriving at the receiving antenna at slightly different angles in the vertical plane. Destructive interference between these rays can produce deep fades (30 dB or more) of the received signal. In the experiment described, it was found that deep fading is often accompanied by strong higher-order mode ... View full abstract»

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  • Design of Space Diversity Receiving and Transmitting Systems for Line-of-Sight Microwave Links

    Publication Year: 1967, Page(s):603 - 614
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1223 KB)

    Severe fading is a substantial factor that impairs the quality or reliability of transmission over line-of-sight microwave relay systems, producing noise bursts and signal interruptions. This paper describes space diversity receiving and transmitting systems developed by the Electrical Communication Laboratory of Nippon Telegraph and Telephone that reduce the effects of such fading. Theoretical re... View full abstract»

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  • Unusual Propagation Factors in Point-To-Point Microwave System Performance

    Publication Year: 1967, Page(s):615 - 625
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    Practical problems in the microwave propagation field, which are considered extraordinary and are largely related to ground reflection phenomena are explored. The effects of these problems in terms of noise, discontinuities, and delay distortion, with the attendant unsatisfactory transmission of telephone message, data, and television signals, were the motivation for the studies described, The sol... View full abstract»

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  • A 12-MHz Transistor Repeater for the CP-12MTr 2700-Channel Transmission System

    Publication Year: 1967, Page(s):625 - 637
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (964 KB)

    A 12-MHz transistor repeater design is described. Phase shift characteristics of transistor circuits are studied as a common problem in extending a bandwidth of the amplifier and repeater system design and experimental data are also presented. View full abstract»

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  • Design of the 46B Cable Carrier Terminal

    Publication Year: 1967, Page(s):637 - 642
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB)

    This paper describes the design of the 46B Cable Carrier Terminal. Included is a description of the modulation plan. A unique frequency correction and regeneration plan is used which provides absolute end-to-end synchronization. The noise improvement resulting from the use of an active-tracking (phase-lock) filter rather than a passive filter for pilot pickoff is described. Some general comments a... View full abstract»

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  • Engineering and Application Features of the 46B Cable Carrier System

    Publication Year: 1967, Page(s):642 - 647
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (823 KB)

    This paper describes a new 24-channel cable carrier system which is end-to-end compatible with the Western Electric N3. The synchronization technique is described, and the method used to provide synchronization when working end-to-end with an N3 terminal is discussed. Level stability, data transmission capability, and general considerations in the layout of the carrier frequency repeatered line ar... View full abstract»

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  • Considerations Affecting the Mitigation of Noise Coupled Between Cable Pairs

    Publication Year: 1967, Page(s):648 - 652
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB)

    Certain mitigative measures which can be employed against metallic noise coupled into telephone circuits in the outside plant are discussed. Quantitative restults are given for separate entrance cable, flat gain amplifiers, arid noise suppression coils. The model used appears to be well-suited to the typical impulse noise problem. View full abstract»

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  • Hard-Limiter Intermodulation with Low Input Signal-to-Noise Ratio

    Publication Year: 1967, Page(s):653 - 654
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    A simple, closed form expression is derived for the normalized power magnitude of major intermodulation (IM) products at the output of an ideal bandpass hard-limiter with low input signal-to-noise ratio, (S/N)_{i} . This expression together with no-noise results obtained by a previous author allows quick plotting of the no-noise and high-noise asymptotes of ... View full abstract»

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  • Quantizing for Correlation Decoding

    Publication Year: 1967, Page(s):655 - 657
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB)

    The increase in error rate due to quantizing is examined for the special case of a digital correlation decoder such as can be used for orthogonal and other block codes. Three types of effect are considered separately: 1) the increase in variance, which is proportional to the square of the quantum interval; 2) a threshold, proportional to the quantum interval, caused by the ambiguity when the recei... View full abstract»

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  • Comparison of Biorthogonal and Bisimplex Codes

    Publication Year: 1967, Page(s):657 - 658
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (242 KB)

    A comparison is made between simplex and orthogonal codes which have been modified by adding their individual complements. The bisimplex code thus formed has reduced efficiency so that the power used must be increased to obtain the same error rate as with the same size of biorthogonal code. It is found that the power advantage of the biorthogonal code is significant only when the code words are sh... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope