scholarly journals Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis

2021 ◽  
Author(s):  
Alexander Maltsev ◽  
Andrey Pudeev ◽  
Seonwook Kim ◽  
Suckchel Yang ◽  
Seunghwan Choi ◽  
...  
Keyword(s):  
Phase Noise ◽  
Time Domain ◽  
Communication Systems ◽  
Phase Error ◽  
Reference Signal ◽  
Phase Tracking ◽  
Noise Compensation ◽  
Novel Approach ◽  
Filter Size ◽  
Training Resources

This paper presents a novel approach to the phase tracking reference signal (PTRS) design for phase noise impact compensation in the 5G NR communication systems intended to work in a new 52.6 GHz to 71 GHz frequency band. For detailed problem illustration, the phase noise compensation algorithms are discussed and explained, from the basic common phase error (CPE) compensation to the MMSE-base inter-carrier interference (ICI) filtering. Performance of the different phase noise compensation algorithms is investigated for the baseline PTRS accepted in the current 5G NR specification and compared with the newly proposed approach to the PTRS design. This approach is based on nulling the subcarriers adjacent to the reference signals to minimize influence of the ICI on the estimation process. It was shown that new nulling PTRS design outperforms currently used distributed PTRS structure. In addition, numerical results represent a trade-off between the filter size and the amount of the allocated training resources to achieve better performance. It was shown that proposed PTRS structures and processing algorithms give ICI compensation level very close to optimal scheme and thus, different approaches (such as time domain compensation) may be required for further progress.

scholarly journals Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6397
Author(s):  
Binqi Wu ◽  
Jin Lu ◽  
Mingyi Gao ◽  
Hongliang Ren ◽  
Zichun Le ◽  
...  
Keyword(s):  
Phase Noise ◽  
Discrete Cosine Transform ◽  
Time Domain ◽  
Phase Error ◽  
Transmission System ◽  
Cosine Transform ◽  
Noise Compensation ◽  
Decision Error ◽  
Dct Coefficients ◽  
The Time Domain

A blind discrete-cosine-transform-based phase noise compensation (BD-PNC) is proposed to compensate the inter-carrier-interference (ICI) in the coherent optical offset-quadrature amplitude modulation (OQAM)-based filter-bank multicarrier (CO-FBMC/OQAM) transmission system. Since the phase noise sample can be approximated by an expansion of the discrete cosine transform (DCT) in the time-domain, a time-domain compensation model is built for the transmission system. According to the model, phase noise compensation (PNC) depends only on its DCT coefficients. The common phase error (CPE) compensation is firstly performed for the received signal. After that, a pre-decision is made on a part of compensated signals with low decision error probability, and the pre-decision results are used as the estimated values of transmitted signals to calculate the DCT coefficients. Such a partial pre-decision process reduces not only decision error but also the complexity of the BD-PNC method while keeping almost the same performance as in the case of the pre-decision of all compensated signals. Numerical simulations are performed to evaluate the performance of the proposed scheme for a 30 GBaud CO-FBMC/OQAM system. The simulation results show that its bit error rate (BER) performance is improved by more than one order of magnitude through the mitigation of the ICI in comparison with the traditional blind PNC scheme only aiming for CPE compensation.

Decision-directed phase noise compensation for millimeter-wave single carrier systems with iterative frequency-domain equalization

2010 ◽  
Vol 2 (3-4) ◽  
pp. 399-408 ◽  
Author(s):  
Satoshi Suyama ◽  
Junichi Onodera ◽  
Hiroshi Suzuki ◽  
Kazuhiko Fukawa
Keyword(s):  
Phase Noise ◽  
Frequency Domain ◽  
Millimeter Wave ◽  
Time Domain ◽  
Wave Band ◽  
60 Ghz ◽  
Transmission Performance ◽  
Frequency Domain Equalization ◽  
Noise Compensation ◽  
Single Carrier

This paper proposes a receiver that repeats iterative frequency-domain equalization (FDE) and decision-directed phase noise compensation (DD-PNC) to alleviate degradation due to the phase noise for millimeter-wave single carrier (SC) systems. High bit-rate SC-FDE transceivers based on the single-chip Si RF-CMOS IC technology in the 60-GHz millimeter-wave band have been extensively studied for wireless personal area network (WPAN) systems, and the relatively large phase noise in a phase-locked loop (PLL) synthesizer severely degrades transmission performance. In an initial processing of the proposed receiver, a cyclic prefix (CP)-based phase noise compensator (CP-PNC) removes the phase noise from a time-domain received signal by using CP, which is known to the receiver, and the channel is equalized by the iterative FDE using the conventional minimum mean-square-error (MMSE) weight. In an iterative processing, DD-PNC estimates the phase noise each symbol by exploiting an output of a channel decoder, and then compensates the time-domain received signal for the phase noise by using the estimate. In order to equalize the compensated received signal, the iterative FDE performs both the MMSE filtering and residual inter-symbol interference cancelation using the decoder output. Computer simulations following the 60-GHz WPAN standard demonstrate that in the 64QAM with the coding rate of 3/4, the proposed receiver with three iterations can drastically remove the phase noise of −85 dBc/Hz at 1 MHz offset, and that it can achieve excellent transmission performance.

scholarly journals PLL wrap function for synchronization in phase jump disturbances

2021 ◽  
Vol 41 (1) ◽  
pp. e84955
Author(s):  
Clementina Rueda Germán ◽  
Iván de Jesús Rivas Cambero ◽  
Hossam A. Gabbar ◽  
José Humberto Arroyo Núñez
Keyword(s):  
Phase Error ◽  
Reference Signal ◽  
Generation System ◽  
Phase Tracking ◽  
Electrical Grid ◽  
Abrupt Changes ◽  
The Time Domain ◽  
Electric Power Generation Systems ◽  
Power Generation Systems ◽  
Sync Pulse

Synchrony plays a major role in the interconnection process between local electric power generation systems and the electrical grid. Grid phase disturbances prevent the generation system from maintaining synchrony. Therefore, an efficient phase tracking method is necessary in order to detect phase jumps and abrupt changes in amplitude. In this paper, we propose a software-designed method to strengthen phase tracking based on the wrap process of a second-level Phase Locked Loop (PLL). The term ‘wrap’ means establishing the phase values of the reference signal in intervals of π to match it with the values obtained from the PLL output (sync pulse). To quantify phase error, a mathematical transformation of the time domain to the frequency domain is implemented. The validity of the proposed wrap function is verified using electrical disturbances.

scholarly journals Experimental Demonstration of the Tradeoff Between Chromatic Dispersion and Phase Noise Compensation in Optical FBMC/OQAM Communication Systems

2019 ◽  
Vol 37 (17) ◽  
pp. 4340-4348 ◽  
Author(s):  
Trung-Hien Nguyen ◽  
Laurent Bramerie ◽  
Mathilde Gay ◽  
Marwa Kazdoghli-Lagha ◽  
Christophe Peucheret ◽  
...  
Keyword(s):  
Phase Noise ◽  
Communication Systems ◽  
Chromatic Dispersion ◽  
Experimental Demonstration ◽  
Noise Compensation

scholarly journals Principles of adaptive element spacing in linear array antennas

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tanzeela Mitha ◽  
Maria Pour
Keyword(s):  
Antenna Arrays ◽  
Communication Systems ◽  
Linear Array ◽  
Main Idea ◽  
Phase Center ◽  
Array Configuration ◽  
Array Antennas ◽  
Center Location ◽  
Novel Approach ◽  
Array Performance

AbstractA novel approach to linear array antennas with adaptive inter-element spacing is presented for the first time. The main idea is based upon electronically displacing the phase center location of the antenna elements, which determine their relative coordinates in the array configuration. This is realized by employing dual-mode microstrip patch antennas as a constitutive element, whose phase center location can be displaced from its physical center by simultaneously exciting two modes. The direction and the amount of displacement is controlled by the amplitude and phase of the modes at the element level. This in turn facilitates reconfiguring the inter-element spacing at the array level. For instance, a uniformly-spaced array could be electronically transformed into a non-uniform one without any mechanical means. The proposed idea is demonstrated in two- and three-element linear antenna arrays. The technique has the potential to control the radiation characteristics such as sidelobe levels, position of the nulls, and the beamwidths in small arrays, which are useful for adaptively controlling the array performance in emerging wireless communication systems and radars.

Laser phase noise compensation in long-range OFDR by using an optical fiber delay loop

2016 ◽  
Vol 365 ◽  
pp. 220-224 ◽  
Author(s):  
Bin Wang ◽  
Xinyu Fan ◽  
Shuai Wang ◽  
Guangyao Yang ◽  
Qingwen Liu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Phase Noise ◽  
Long Range ◽  
Noise Compensation ◽  
Delay Loop
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