Design and evaluation of spectrum efficient WR-OFDM system for 5G and B5G mobile system

An, Changyoung; Kim, Byeongjae; Ryu, Heung‐Gyoon

doi:10.1109/comcas.2017.8244714

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…This technique requires only one multiplication, and thus, complexity is reduced. 19,42,43 The windowing process of the proposed scheme at the transmitter side is shown in Figure 4. WL represents the window length; we can get the lower OOB power emission by increasing the window length.…”

Section: Windowing Processmentioning

confidence: 99%

Advanced OTFS communication system with compact spectrum and power efficiency improvement

Hossain

Ryu

2021

Int J Communication

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Orthogonal time frequency space (OTFS) modulation technique is one-step more precoded system of the conventional orthogonal frequency division multiplexing (OFDM) system, i.e., a double precoded system. The OTFS system was suggested especially for the robust and reliable high-speed vehicle communications and massive multiple-input multiple-output (MIMO) systems. Nevertheless, this basic OTFS system has serious problems: high out-of-band (OOB) power emission and high peak-to-average power ratio (PAPR). This high OOB power spectrum requires a very wide guard band that can produce a great loss of frequency utilization efficiency, and the power efficiency becomes very poor due to this high PAPR problem. Therefore, in this paper, in order to mitigate these drawbacks, an advanced OTFS communication system is proposed to show the compact OOB power spectrum and power efficiency improvement.This system can be designed by discrete Fourier transform (DFT)-spread windowing and restructuring-OTFS (DFT-Spread WR-OTFS) scheme that can reduce PAPR by 2.1 dB, 0.5 dB, 1.7 dB, and 1.8 dB compared to the conventional OFDM, DFT-Spread OFDM, basic OTFS and WR-OTFS schemes, respectively. Consequently, the efficiency of the high power amplifier (HPA) is improved due to the low PAPR of the proposed system. In addition, we comprehensively evaluate the impact of PAPR reduction performance on the OOB power spectrums and bit error rate (BER) performance of each system in HPA linear and nonlinear environments. Simulation results verify that the power spectrums and the BER performance of the proposed system are better than the conventional schemes in HPA nonlinear environments.

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Section: Windowing Processmentioning

confidence: 99%

Advanced OTFS communication system with compact spectrum and power efficiency improvement

Hossain

Ryu

2021

Int J Communication

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“…A set of symbols are mapped onto adjacent sub-carriers in the frequency domain, employing an Inverse Fast Fourier Transformation [15]. A Cyclic Prefix (CP) is added to preserve orthogonality and reduce Inter-Symbol Interference (ISI) [16]. One of the main benefits of CP-OFDM is its simplicity, and its susceptibility against ISI and fading.…”

Section: Transmission Of Ofdm Waveform In a Dispersive Mediummentioning

confidence: 99%

“…and consequently lowering the error rate. A quantitative measure of the improvement is expressed via the average EVM relative reduction (in [%]): EVM w/o−comp − EVM w−comp EVM w/o−comp• 100%(16) …”

mentioning

confidence: 99%

Atmospheric Effects on OFDM Wireless Links Operating in the Millimeter Wave Regime

Golovachev

Pinhasi

2020

Electronics

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The development of millimeter wave communication links and the allocation of bands within the Extremely High Frequency (EHF) range for the next generation cellular network present significant challenges due to the unique propagation effects emerging in this regime of frequencies. This includes susceptibility to amplitude and phase distortions caused by weather conditions. In the current paper, the widely used Orthogonal Division Frequency Multiplexing (OFDM) transmission scheme is tested for resilience against weather-induced attenuation and phase shifts, focusing on the effect of rainfall rates. Operating frequency bands, channel bandwidth, and other modulation parameters were selected according to the 3rd Generation Partnership Project (3GPP) Technical Specification. The performance and the quality of the wireless link is analyzed via constellation diagram and BER (Bit Error Rate) performance chart. Simulation results indicate that OFDM channel performance can be significantly improved by consideration of the local atmospheric conditions while decoding the information by the receiver demodulator. It is also demonstrated that monitoring the weather conditions and employing a corresponding phase compensation assist in the correction of signal distortions caused by the atmospheric dispersion, and consequently leads to a lower bit error rate.

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“…It has also been adopted for the cellular telecommunications standard LTE / LTE-A, WiMAX [8] and many more. Many approaches confirm that an OFDM family is the right candidate for 5G like W-OFDM [9], G-DFT-s-OFDM [10], WR-OFDM [11] and F-OFDM [12].…”

Section: Introductionmentioning

confidence: 99%

SαS noise suppression for OFDM wireless communication in rayleight channel

Hamlili¹,

Kameche²,

Abdelmalek³

2020

IJECE

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Orthogonal frequency division multiplexing (OFDM) is a form of multi-carrier transmission technique widely used in the modern wireless network to achieve high-speed data transmission with good spectral efficiency. However, in impulsive noise environement BER performances of these systems, originally designed for a Gaussian noise model, are much degraded. In this paper, a new symmetric-alpha-stable (SαS) noise suppression technique based conjointly on adaptive modulation, convolutional coding (AMC) and Recursive Least Square (RLS) filtering is presented. The proposed scheme is applied on OFDM system in Rayleigh fading channel. The transmissions are analyzed under different combinations of digital modulation schemes (BPSK, QPSK, 16-QAM, 64-QAM) and convolutional code rates (1/2, 2/3, 3/4). Simulation results show that our proposed hybrid technique provides effective impulsive noise cancelation in OFDM system and exhibits better BER performance.

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Design and evaluation of spectrum efficient WR-OFDM system for 5G and B5G mobile system

Cited by 9 publications

References 7 publications

Advanced OTFS communication system with compact spectrum and power efficiency improvement

Advanced OTFS communication system with compact spectrum and power efficiency improvement

Atmospheric Effects on OFDM Wireless Links Operating in the Millimeter Wave Regime

SαS noise suppression for OFDM wireless communication in rayleight channel

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