Optimal Waveform of the Partial-Respond Signal Based on Minimum Out-of-Band Radiation Criterion

Shang, Wenjing; Xu, Yidong; Qi, Junwei; Xue, Wei; Makarov, Sergey B.

doi:10.3390/app7101086

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The analytical solution to the optimization problem (6) is possible only for the parameters n = 1 and the pulse duration equal to T [21]. In [22], the analytical solution to more complex optimization cases with quadrature signals and T s = 4T is brought to the Lagrange equations, which can be solved numerically. When the number of optimization constraints or the values of optimization parameters (i.e., n, T s ) increase, the analytical closed-form solution cannot be obtained.…”

Section: Optimization Problem With Constraint On Paprmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Optimization Problem With Constraint On Paprmentioning

confidence: 99%

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

et al. 2021

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“…Radar sensors allow solving the problem of detection and recognition of stationary and moving small objects, including hidden by vegetation and snow cover. Millimeter-range radars are used to detect small objects on the sea surface and in coastal marine areas (Korobeynikov et al, 2016;Ziniakov et al, 2016;Shang et al, 2017;Klochkov et al, 2018). However, radar sensors also have a number of disadvantages compared to optical ones.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Matching of the Radar Signal and Image Display Device Dynamic Ranges

Garmash¹,

Petrov²,

Andreev³

et al. 2019

Int J Math, Eng, Manag Sci

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This article presents nonlinear radar signal processing method to form an image of the Earth's surface. The method proposes to match the dynamic ranges of the received signal and of the visualization device. The essence of the method is adaptive nonlinear signal processing, which provides better local contrast of radar images and improves discrimination of individual objects. The computational complexity of the proposed algorithm is optimized and allows real-time implementation in the airborne computing systems with limited computational power. Objects with large RCS merged into large illuminated "spots"; their visibility on the surrounding background has been reduced, unwanted effects are due to the fact that the above algorithms have a single point effect. To overcome the problems, the «Retinex» algorithm is usually used. They do not take into account the local neighborhood of pixels; therefore, in cases where the image contains both highly dark and strongly light local areas, these algorithms cannot provide high-quality matching of dynamic ranges.

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The Method of Generating Random OQPSK Signal Packets Based on Optimal FTN Pulses with Reduced PAPR and Frequency Band

Ovsyannikova

Makarov

2022

Springer Proceedings in Physics

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Optimal Waveform of the Partial-Respond Signal Based on Minimum Out-of-Band Radiation Criterion

Cited by 4 publications

References 12 publications

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

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

Adaptive Matching of the Radar Signal and Image Display Device Dynamic Ranges

The Method of Generating Random OQPSK Signal Packets Based on Optimal FTN Pulses with Reduced PAPR and Frequency Band

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