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 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 A Reduction of Peak-to-Average Power Ratio Based Faster-Than-Nyquist Quadrature Signals for Satellite Communication

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 346
Author(s):  
Sergey B. Makarov ◽  
Mingxin Liu ◽  
Anna S. Ovsyannikova ◽  
Sergey V. Zavjalov ◽  
ILya Lavrenyuk ◽  
...  
Keyword(s):  
Phase Shift ◽  
Satellite Communication ◽  
Average Power ◽  
Reduction Rate ◽  
Digital Television ◽  
Power Ratio ◽  
Phase Shift Keying ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

The increase in the throughput of digital television and radio broadcasting (DVB) channels can be achieved due to application of signals with a compact spectrum and a relatively small peak-to-average power ratio (PAPR). The reason is the usage of traveling wave tubes (TWT) for amplifying and transmitting signals from a satellite repeater in DVB-S2X systems. At the same time, given that the bandwidth allocated for transmission should be used as efficiently as possible, a high reduction rate of out-of-band emissions level is required. The most effective solution in this direction is the transition to spectrum-economic signals, such as optimal Faster-Than-Nyquist (FTN) signals, which can provide a certain reduction rate of the out-of-band emissions level and minimum acceptable PAPR. This article proposes a method for obtaining optimal FTN pulses, which have symmetry in time domain, with specified PAPR and reduction rate of out-of-band emissions for the quadrature phase shift keying (QPSK) and offset quadrature phase shift keying (OQPSK). The possibility of synthesizing signals with OQPSK modulation is presented theoretically for the first time. Optimal FTN signals can provide PAPR reduction by at most 3 dB and outperform known root raised cosine (RRC) pulses. The simulation model adopts an architecture for quadrature generation of optimal FTN signals with OQPSK modulation with blocks for adjustable pre-amplification, clipping, and power amplification. The proposed signals can be used to increase the spectral and energy efficiencies of satellite broadcasting systems, such as DVB-S2/S2X, as well as low-rate return channels of interactive broadcasting systems with a frequency resource shortage.

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.

Performance Enhancement of 10 Gbps OCDMA Networks Using DPSK and DQPSK with Unique Code-Sequence

2014 ◽  
Vol 974 ◽  
pp. 274-281
Author(s):  
Go Yun Ii ◽  
Thio Tzer Hwai Gilbert ◽  
K. Dimyati
Keyword(s):  
Phase Shift ◽  
Performance Enhancement ◽  
Transmission Rate ◽  
Area Network ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Metropolitan Area Network ◽  
Differential Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying

This paper demonstrates the achievable performance enhancement in a multi-user network using optical unique code sequences. The study is conducted in a four-user Metropolitan Area Network (MAN) with a transmission rate of 10 Gbps. This paper investigates the feasibility of implementing Differential Phase Shift Keying (DPSK) and Differential Quadrature Phase Shift Keying (DQPSK) technique to replace conventional techniques such as On-Off Keying (OOK) and Amplitude Shift Keying (ASK). The performance of the integrated formulation of optical unique code sequenceswith DPSK and DQPSKtechnique is evaluated by determining the Bit Error Rate (BER) for various configurations and transmission distances up to 100 km.

A BINARY PHASE-SHIFT KEYING RECEIVER FOR THE DETECTION OF ATTENTION TO HUMAN SPEECH

2013 ◽  
Vol 23 (04) ◽  
pp. 1350016 ◽  
Author(s):  
M. A. LOPEZ-GORDO ◽  
F. PELAYO
Keyword(s):  
Phase Shift ◽  
Real Time ◽  
Transmission Rate ◽  
Event Related Potentials ◽  
Phase Shift Keying ◽  
Human Speech ◽  
Binary Phase ◽  
Shift Keying ◽  
Related Potentials ◽  
Binary Phase Shift Keying

Synthetic sounds, tone-beeps, vowels or syllables are typically used in the assessment of attention to auditory stimuli because they evoke a set of well-known event-related potentials, whose characteristics can be statistically contrasted. Such approach rules out the use of stimuli with non-predictable response, such as human speech. In this study we present a procedure based on the robust binary phase-shift keying (BPSK) receiver that permits the real-time detection of selective attention to human speeches in dichotic listening tasks. The goal was achieved by tagging the speeches with two barely-audible tags whose joined EEG response constitutes a reliable BPSK constellation, which can be detected by means of a BPSK receiver. The results confirmed the expected generation of the BPSK constellation by the human auditory system. Also, the bit-error rate and the information transmission rate achieved in the detection of attention fairly followed the expected curves and equations of the standard BPSK receiver. Actually, it was possible to detect attention as well as the estimation a priori of its accuracy based on the signal-to-noise ratio of the BPSK signals. This procedure, which permits the detection of the attention to human speeches, can be of interest for new potential applications, such as brain–computer interfaces, clinical assessment of the attention in real time or for entertainment.

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