scholarly journals Efficiency of adaptive filter with envelope tracking algorithm when receiving signals with multi-position PSK against the background of non-fluctuation interferences

2020 ◽  
Vol 8 (5) ◽  
pp. 34-43
Author(s):  
G. V. Kulikov ◽  
Trung Tien Do
Keyword(s):  
Phase Shift ◽  
Adaptive Filter ◽  
Noise Immunity ◽  
Phase Shift Keying ◽  
Throughput Rate ◽  
Radio Channels ◽  
Recursive Filters ◽  
Constant Envelope ◽  
Useful Signal ◽  
Shift Keying

The energy and spectral advantages of signals with phase-shift keying predetermined their widespread use in modern digital navigation, communications and television systems. The use of this type of signal in a multi-position format with an increased number of possible phase states allows increasing the information capacity of the channel signal, and consequently the throughput rate of radio channels. The presence of non-fluctuation interference in such radio channels greatly reduces the noise immunity of information reception. A well-known way to deal with such interference is to use adaptive non-recursive filters in the receiver. The article evaluates the effectiveness of using such a filter with an algorithm for setting weight coefficients that controls the constant envelope of a useful signal when receiving signals with multi-position phase shift keying against the background of noise and non-fluctuation interference. Two types of such interference are considered – harmonic and relayed. Using computer simulation, the optimal filter parameters (adaptation coefficient and its length) are determined; the effect of the filter on the noise immunity of the quadrature signal receiver with multi-position phase shift keying for various combinations of interference and their intensity is estimated. It is shown that such an adaptive filter can successfully cope with the most dangerous sighting harmonic interference.

scholarly journals Noise immunity of receiving signals with amplitude and phase-shift keying in the presence of phase-shift keying interference

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
G.V. Kulikov ◽  
◽  
Khang Dang ◽  
Keyword(s):  
Phase Shift ◽  
Noise Immunity ◽  
Transmission Rate ◽  
Radio Channel ◽  
Signal Spectrum ◽  
Digital Television ◽  
Phase Shift Keying ◽  
Video Information ◽  
Useful Signal ◽  
Shift Keying

The development of television technologies and the need to transmit high-quality video information requires that modern digital television and broadcasting systems can transmit large amounts of information. The use of signals with multi-position amplitude and phase-shift keying 16-APSK and 32-APSK in DVB-S2 generation satellite television systems made it possible to transmit 30% more data in the same frequency bands compared to the previous DVB-S standard. The latest DVB-S2X digital satellite TV standard is an extension of the DVB-S2 standard and supports modulations of 64,128,256-APSK. It is known that increasing the positionality of signals reduces the noise immunity of their reception and the system as a whole. In addition, the presence of non-fluctuation interference in the radio channel that falls into the frequency band of the useful signal has a strong influence on noise immunity. The article uses statistical radio engineering methods to calculate the probability of a bit error when receiving M-APSK signals against the background of phase-shift keying interference at different parameters of the latter. It is shown that of phase-shift keying interference of even low intensity (µ < 0.3) falling into the main lobe of the signal spectrum significantly reduces the noise immunity of receiving 16-APSK and 32-APSK signals. High-intensity interference (µ ≥ 0.5) practically destroys reception. The influence of phase-shift keying interference decreases with an increase in its detuning relative to the carrier frequency of the useful signal and an increase in the relative transmission rate of the interference. A comparison of the reception quality when using M-PSK, M-QAM and M-APSK signals is carried out and it is shown that the noise immunity of receiving M-QAM and M-APSK against the background of phase-shift keying interference is approximately the same. M-PSK signals are significantly inferior to them in terms of reception noise immunity.

scholarly journals Application of Broadband Signals to Increase Interference Immunity in Channels with Inter-Symbol Interference

2021 ◽  
Vol 2096 (1) ◽  
pp. 012046
Author(s):  
V K Fedorov ◽  
E G Balenko ◽  
S V Dvornikov ◽  
O S Lauta
Keyword(s):  
Phase Shift ◽  
Fading Channels ◽  
Noise Immunity ◽  
Phase Shift Keying ◽  
Practical Application ◽  
Interference Immunity ◽  
Shift Keying ◽  
Rice Fading ◽  
Inter Symbol Interference

Abstract Proposals for improving the noise immunity of receiving phase-shift keying signals in the conditions of inter-symbol interference caused by fading in the channel are presented. The use of Barker sequences for the expansion of modulating information pulses has been substantiated. The results of evaluating the noise immunity of Rice fading channels at various ratios of the effective voltages of the regular and diffuse signal components are presented. Proposals for the practical application of the results obtained are formulated.

scholarly journals Reception of differential binary phase shift keying signals with weight processing of sub-symbols in information transmission systems with frequency hopping spread spectrum.

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
A.A. Paramonov ◽  
◽  
Van Zung Hoang ◽  
Keyword(s):  
Phase Shift ◽  
Spread Spectrum ◽  
Noise Immunity ◽  
Frequency Hopping ◽  
Phase Shift Keying ◽  
Radio Communication ◽  
Frequency Hopping Spread Spectrum ◽  
Shift Keying ◽  
Radio Communication System ◽  
Binary Phase Shift Keying

Signals with frequency hopping spread spectrum (FHSS) have long been widely used in military radio communication systems (RCS) due to their frequency-energy characteristics. In such systems, the most important characteristic is noise immunity, i.e. the ability to ensure reliable transmission and reception of information under the influence of various types of organized intentional and unintentional interference. In this paper, we consider the case when the input of the receiver, in addition to the receiver's own noise, contains deliberate interference, which is considered noise interference. In this case, it is assumed that the interference covers only part of the operating frequencies of the radio communication system. The algorithm of optimal noncoherent signal reception with weight processing for making a decision about the transmitted symbol (bit) is in the focus of the paper. Static radio engineering methods, as well as Monte Carlo simulation, have been used to evaluate the noise immunity of receiving differential binary phase shift keying signals with FHSS when exposed to deliberate Partial-Band Interference. It is shown that the noise immunity of a radio communication system under conditions of destructive influence can be improved by using the intra-symbols FHSS mode with the proposed reception algorithm. With an increase in the signal-to-interference ratio, the noise immunity of information transmission increases significantly. The optimal strategy for dealing with Partial-Band Interference when the RCS is operating in the intra-symbols FHSS mode is to select the optimal multiplicity of symbol frequency diversity, which minimizes the probability of a bit error probability. The obtained dependencies are presented in order to compare and determine the effectiveness of the considered transmission mode with the proposed reception algorithm.

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