On the Phase Tracking Reference Signal (PT-RS) Design for 5G New Radio (NR)

This paper presents a new architecture for a synchronized frequency multiplier circuit. The proposed architecture is an all-digital dual-loop delay- and frequency-locked loops circuit, which has several advantages, namely, it does not have the jitter accumulation issue that is normally encountered in PLL and can be adapted easily for different FPGA families as well as implemented as an integrated circuit. Moreover, it can be used in supplying a clock reference for distributed digital processing systems as well as intra/interchip communication in system-on-chip (SoC). The proposed architecture is designed using the Verilog language and synthesized for the Altera DE2-70 development board. The experimental results validate the expected phase tracking as well as the synthesizing properties. For the measurement and validation purpose, an input reference signal in the range of 1.94–2.62 MHz was injected; the generated clock signal has a higher frequency, and it is in the range of 124.2–167.9 MHz with a frequency step (i.e., resolution) of 0.168 MHz. The synthesized design requires 330 logic elements using the above Altera board.

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New Reference Signal Design for URLLC and eMBB Multiplexing in New Radio Wireless Communications

2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) ◽

10.1109/pimrc.2018.8580882 ◽

2018 ◽

Cited By ~ 2

Author(s):

Hongyang Chen ◽

Jianming Wu ◽

Tsuyoshi Shimomura

Keyword(s):

Wireless Communications ◽

Reference Signal ◽

Signal Design ◽

New Radio

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Reference Signal Design for Remote Interference Management in 5G New Radio

2019 European Conference on Networks and Communications (EuCNC) ◽

10.1109/eucnc.2019.8802014 ◽

2019 ◽

Author(s):

Elena Peralta ◽

Mikko Maenpaa ◽

Toni Levanen ◽

Youngsoo Yuk ◽

Klaus Pedersen ◽

...

Keyword(s):

Interference Management ◽

Reference Signal ◽

Signal Design ◽

New Radio

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

10.3233/faia210412 ◽

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.

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PLL wrap function for synchronization in phase jump disturbances

Ingeniería e Investigación ◽

10.15446/ing.investig.v41n1.84955 ◽

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.

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Remote interference management in 5G new radio: methods and performance

EURASIP Journal on Wireless Communications and Networking ◽

10.1186/s13638-021-01926-2 ◽

2021 ◽

Vol 2021 (1) ◽

Author(s):

Elena Peralta ◽

Toni Levanen ◽

Mikko Mäenpää ◽

Youngsoo Yuk ◽

Klaus Pedersen ◽

...

Keyword(s):

Frequency Domain ◽

Mobile Networks ◽

Interference Management ◽

Reference Signal ◽

Propagation Delay ◽

Detection Algorithm ◽

Base Stations ◽

Ofdm Symbol ◽

New Radio ◽

And Performance

AbstractIn time division duplexing based mobile networks, under certain atmospheric ducting conditions, the uplink reception may be interfered by the downlink transmissions of remote base-stations (gNBs) located hundreds of kilometers away. This paper addresses such remote interference problem in a 5G new radio (NR) macro deployment context. Specifically, two potential reference signal (RS) designs for remote interference management (RIM) are described. The first signal structure, denoted as the one OFDM symbol (1OS) based RIM-RS, is building on the channel state information reference signals of 5G NR. The second candidate is referred to as the two OFDM symbol based RIM-RS design, which builds on the design principles of LTE RIM-RS. The achievable detection performance is evaluated by introducing enhanced receiver algorithms together with three feasible propagation delay based gNB grouping and corresponding RIM-RS transmissions schemes. The performance results in terms of the receiver processing gain highlight that the improved detection algorithm assures sufficient performance to detect the remote interference for both RIM-RSs with all evaluated frequency domain comb-like patterns. The benefit of grouping corresponding RIM-RS transmissions from gNBs located on the same area is greater when using same frequency domain resources per transmitted sequence in practical interference scenarios. Furthermore, applying a common base sequence for all gNBs within a group allows to identify the group based on detected sequence and enables adaptive RIM mitigation schemes. On the other hand, it is shown that the 1OS RIM-RS provides smaller overhead and can be frequency multiplexed with the physical downlink shared channel, which opens up the possibility of using gNB group wise 1OS RIM-RS also for UE interference measurements.

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