High-order circular QAM constellation with high LDPC coding rate for phase noise channels

Zheng, Bailin; Deng, Lianjun; Sawahashi, Mamoru; Kamiya, Norifumi

doi:10.1109/wpmc.2017.8301807

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…QAM serves as one of the critical technologies in the fifth-generation (5G) and beyond 5G communication systems. However, when the energy is fixed, QAM leads to a smaller distance between constellation points on the normalized constellation diagram, and thus the processing complexity at receivers increases [4]. As a bandwidth saving method, blind equalization can effectively compensate for the distortion induced by the signal in frequencyselective fading channels.…”

Section: Introductionmentioning

confidence: 99%

Energy and Spectrum Efficient Blind Equalization With Unknown Constellation for Air-to-Ground Multipath UAV Communications

Liu

Shang

et al. 2021

IEEE Trans. on Green Commun. Netw.

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Section: Introductionmentioning

confidence: 99%

Energy and Spectrum Efficient Blind Equalization With Unknown Constellation for Air-to-Ground Multipath UAV Communications

Liu

Shang

et al. 2021

IEEE Trans. on Green Commun. Netw.

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“…The most apparent transformation taking place with 5G NR is the move towards higher millimeter wave (mmWave) frequencies as a very promising approach to significantly boost the capacity of 5G. However, mmWave devices and network access points suffer from severe phase noise mainly due to the mismatch of transmitter and receiver frequency oscillators [3]- [4]. Basically, phase noise is caused by noise in the active components and lossy elements which is up-converted to the carrier frequency.…”

Section: Introductionmentioning

confidence: 99%

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

Hunukumbure

Nam

et al. 2018

2018 IEEE 88th Vehicular Technology Conference (VTC-Fall)

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The volume of mobile data traffic has been driven to an unprecedented high level due to the proliferation of smartphones/mobile devices that support a wide range of broadband applications and services, requiring a next generation mobile communication system, i.e., the fifth generation (5G). Millimeter wave (mmWave) bands can offer much larger available spectrum bandwidth and thus are considered as one of the most promising approaches to significantly boost the capacity in 5G NR. However, devices and network radio nodes operating on mmWave bands suffer from phase noise and without correction of phase noise, the performance of the network could potentially suffer significant losses. In this paper, we investigate the effects of phase noise and provide comprehensive solutions to track the phase noise by using phase tracking reference signals (PT-RS), as currently standardized in 3GPP Release 15. The design aspects such as PT-RS pattern, interference randomization, multi-TRP operation, etc., are investigated and evaluation results are also provided.

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“…The achievable modulation orders in these systems are limited by several practical constraints specially those imposed by the hardware impairments in the radio frequency (RF) front-end [9][10][11][12][13]. Among various RF impairments, the oscillator phase noise (PN) is one of the key contributors in degrading the performance of PtPMRLs and limiting the modulation order increase [14][15][16][17][18].…”

Section: Oscillator Ph In Qam-ldpc Coded Systemsmentioning

confidence: 99%

Performance Enhancement of High Order LDPC Coded Modulation Systems with Application in Mobile Backhaul Networks

Neshaastegaran¹

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Wireless backhaul communication systems play a crucial role in the infrastructure of current cellular networks. In light of the expensive costs of fiber deployment, the importance of these links is anticipated to continue over the next few decades.Point-to-point microwave radio links (PtPMRLs) are the backbone of every wireless backhaul system. To achieve higher spectral efficiencies, the PtPMRL are designed based on the concurrent exploitation of high-order modulations and powerful forward error correcting codes. An example of such design paradigm is the high-order lowdensity-parity-check coded modulation systems (LDPC-CMSs). In this thesis two key challenges in the high-order LDPC-CMSs are overcome.In our first contribution, we consider the problem of oscillator phase hit (PH) in microwave backhaul communication links. PH results in a temporary link loss in the communication system and bears an expensive cost on the operators. In this work, we propose a two-stage solution to mitigate PH. In the first stage, we use Neyman-Pearson binary hypothesis testing to develop a low cost PH detection algorithm.In this test, a likelihood ratio test is designed and the optimal detection threshold is analytically calculated. The proposed PH detection scheme entails small real-time computations while using the existing pilot symbols in the system; thus, no extra pilot overhead is required. In the second stage, we use maximum likelihood estimation to develop a PH correction scheme. In particular, we formulate the joint estimation of phase noise (PN) and PH as a maximum likelihood estimation problem. Solving this problem results in the estimation of PN with the location and magnitude of PH. By applying the proposed correction scheme, the number of affected symbols by PH is significantly reduced. In particular, the number of remaining erroneous symbols due to PH (if any) is within the error correction capability of modern LDPC codes used iii Table of Contents viii List of Tables xi List of Figures xiii List of References 103Appendix A

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High-order circular QAM constellation with high LDPC coding rate for phase noise channels

Cited by 11 publications

References 6 publications

Energy and Spectrum Efficient Blind Equalization With Unknown Constellation for Air-to-Ground Multipath UAV Communications

Energy and Spectrum Efficient Blind Equalization With Unknown Constellation for Air-to-Ground Multipath UAV Communications

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

Performance Enhancement of High Order LDPC Coded Modulation Systems with Application in Mobile Backhaul Networks

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