Volume 3, Number 5 (2017)
A.A. Mitrofanov, A.R. Safin, N.N. Udalov
PHASE NOISES OF A SPIN-TRANSFER NANO-OSCILLATOR WHEN SYNCHRONIZING A PHASE AUTOMATIC FREQUENCY SYSTEM AND AN EXTERNAL HARMONIC SIGNAL (pp. 3-8)
S.V. Petushkov, L.A. Belov
DIGITAL LINEARIZATION SYSTEM OF TRANSISTOR MICROWAVE POWER AMPLIFIER BY PREDICTION BY EVEN HARMONICS (pp. 9-13)
N.E. Poborchaya, E.R. Khasyanova
COMPENSATION OF SIGNAL DISTURBANCES IN A CHANNEL WITH SLOW RELAY RELAYS (pp. 14-17)
I.V. Ryabov, I.V. Strelnikov, S.V. Tolmachev
DIGITAL FREQUENCY SYNTHESIS FOR MULTI-FREQUENCY TELEGRAPHY (pp. 18-22)
N.I. Smirnov, V.A. Sivov, V.I. Filatov
DEVELOPMENT OF A METHOD FOR SELECTING A COMPLEX SIGNAL AND ITS PROCESSING DEVICES FOR SATELLITE ASYNCHRONOUS INFORMATION TRANSMISSION SYSTEMS (pp. 23-27)
V.E. Turov, L.N. Kazakov, D.Yu. Vishnyakov, D.S. Pogrebnoy
RESEARCH OF THE INFLUENCE OF PHASE NOISE OF NODES OF A SIGNAL FORMING DEVICE ON THE COHERENT ACCUMULATION EFFICIENCY OF A SHORT RADIO PULSES (pp. 28-33)
ABSTRACTS & REFERENCES
PHASE NOISES OF A SPIN-TRANSFER NANO-OSCILLATOR WHEN SYNCHRONIZING A PHASE AUTOMATIC FREQUENCY SYSTEM AND AN EXTERNAL HARMONIC SIGNAL
National Research University “MPEI”; LLC “Radiocomp”,
A.R. Safin, N.N. Udalov,
National Research University of MPEI, Moscow, Russia
The current trend in electronics is to reduce the size of key elements and devices. High demands are placed on the basic characteristics of these devices. Therefore, many scientific groups are studying the so-called spin-transfer nano-oscillators, which allow microwave oscillations to be obtained in a wide frequency range and have sizes on the order of tens and hundreds of nanometers. The unsolved problem is the low output power of a single oscillator and the low frequency stability of the output oscillations. One method to improve noise performance is to use synchronization systems. For any generator, one of the main characteristics is the phase noise level. The first measurements showed a high value of phase noise, which does not meet the requirements of telecommunication and transmitting devices. One way to reduce them is to use a phase locked loop. One of the applications of phase self-tuning of the frequency of spin-transfer nano-oscillators is the creation of devices for measuring phase noise. Previously, the authors investigated the dynamics of such systems. A comparison of the amplitude and phase noise of an autonomous and synchronized phase-locked loop with the external harmonic effect of spin-transfer nanoscillators is presented.
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DIGITAL LINEARIZATION SYSTEM OF TRANSISTOR MICROWAVE POWER AMPLIFIER BY PREDICTION BY EVEN HARMONICS
In transistor power amplifiers (TPA) of a complex signal, when operating in non-linear mode near the saturation region of the active element, a contradiction arises between the energy efficiency in the working frequency band and the permissible level of out-of-band intermodulation emissions in neighboring frequency bands, which violates the requirements of electromagnetic compatibility. In the microwave range, the contradiction is aggravated, in addition to the effects of AM / AM compression, by the influence of variations in the input amplitude on changes in the phase shift (AM / FM conversion). The main technical solution to resolve this contradiction is to reduce the TPA output power level to -10 dB compared to the nominal value for the harmonic input signal, with this mode of operation, the efficiency is reduced by 40%. Therefore, the most effective technical solution to this contradiction today is the use of pre-distorting linearization systems TPA. TPA analog prediction linearization systems are difficult to configure, have a limited band of transmitted frequencies and do not allow adaptive correction when environmental factors affecting the characteristics of TPA are changed. Known linearization options based on the use of even harmonics of the information message are implemented as part of a digital modulating signal generating unit in the base frequency band, provide an increase in TPA energy efficiency and a simultaneous decrease in the level of interfering third-order radiation from them. However, near saturation, the interfering components of not only the 3rd, but also the 5th and other odd orders have a comparable level, therefore, eliminating only the 3rd order components does not completely remove the linearization of the TPA characteristics. The purpose of the study of the presented FNG system is to consider the possibility of simultaneously minimizing the total power of interfering components of the 3rd and 5th orders in the TPA operation mode near the saturation region with increasing energy efficiency of the cascade taking into account the phenomena of AM / AM and AM / FM transformations.
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COMPENSATION OF SIGNAL DISTURBANCES IN A CHANNEL WITH SLOW RELAY RELAYS
An algorithm for compensating signal distortions in a channel with Doppler spreading and Rayleigh fading is considered. The quadrature components of the channel are estimated using polynomial approximation inside the temporary sliding window and the least squares method. Formulation of the problem. To compensate for signal distortions, such as amplitude-phase imbalance, constant component drift, and its further quasicoherent reception, it is necessary to know the communication channel. Often in algorithms for estimating unknown parameters of a signal, it is assumed that its amplitude is constant or changes very slightly. This is true for fixed or slow moving subscribers. Otherwise, the assumption that the amplitude of the signal is constant becomes unfair, the complex channel multiplier varies with time. Under these conditions, the sample size of the signal, at which its amplitude can be considered constant, is reduced, which leads to a decrease in the accuracy of estimating the signal parameters and an increase in the probability of error. The communication channel is modeled using the Jakes model, which takes into account the Doppler spread of the signal spectrum, subject to Rayleigh fading.
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DIGITAL FREQUENCY SYNTHESIS FOR MULTI-FREQUENCY TELEGRAPHY
I.V. Ryabov, I.V. Strelnikov, S.V. Tolmachev,
Volga State Technological University, Yoshkar-Ola, Russia
A new structure of a digital frequency synthesizer is considered, which has increased speed and allows the formation of a complex frequency-modulated signal that can be used in modern communication systems.
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DEVELOPMENT OF A METHOD FOR SELECTING A COMPLEX SIGNAL AND ITS PROCESSING DEVICES FOR SATELLITE ASYNCHRONOUS INFORMATION TRANSMISSION SYSTEMS
N.I. Smirnov, MTUCI,
V.A. Sivov, VA Strategic Missile Forces named after Peter the Great,
V.I. Filatov, firstname.lastname@example.org,
MSTU N.E.Bauman, Moscow, Russia
The problem of multicriteria choice of the type of signal-code construction for asynchronous information transmission systems is investigated. When taking into account the requirements for this asynchronous information transfer system. It justifies the consideration of the main quality indicators of asynchronous information transmission systems, which must be taken into account when choosing the type of complex noise-like signal and structural schemes for their optimal processing.
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RESEARCH OF THE INFLUENCE OF PHASE NOISE OF NODES OF A SIGNAL FORMING DEVICE ON THE COHERENT ACCUMULATION EFFICIENCY OF A SHORT RADIO PULSES
V.E. Turov, email@example.com,
L.N. Kazakov, firstname.lastname@example.org,
D.Yu. Vishnyakov, email@example.com,
D.S. Pogrebnoy, firstname.lastname@example.org,
Yaroslavl State University P.G. Demidov, Yaroslavl, Russia
The efficiency of coherent accumulation of a packet of short radio pulses was studied depending on the parameters of the PSD phase noise of the signal at the ADC input. Losses with respect to ideal coherent accumulation (accumulation according to the N law) in the interval of 15,000 radio pulses (6 ms) do not exceed 0.02 dB; therefore, accumulation should be considered effective. A linear dependence is observed on the length of the coherent packet, which allows us to assert effective accumulation at times up to tenths of a second with losses up to 0.04 dB.
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