Time–Frequency Warped Waveforms

Ibrahim, Mostafa; Demir, Ali Fatih; Arslan, Hüseyin

doi:10.1109/lcomm.2018.2882498

Cited by 6 publications

(1 citation statement)

References 46 publications

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“…UFMC is a technique that involves the filtration of sub-carriers prior to transmission and reception so that the ISI and ICI can be eliminated. UFMC is a modulation technique that can be considered as a generalized Filter Bank Multi-Carrier technique (FBMC) [24][25][26][27][28][29] and filtered OFDM. More so, it is a multicarrier modulation technique with orthogonal sub-carriers that enhance the mitigation of the problem of orthogonality loss at the side of the receiver.…”

Section: Ufmc Architecturementioning

confidence: 99%

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

Hammoodi¹,

Audah²,

Al-Jobouri³

et al. 2022

Computers, Materials &Amp; Continua

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OFDM based waveforms are considered as the main part of the latest cellular communications standard (namely 5G). Many inherited problems from the OFDM-Based LTE are still under investigation. Getting rid of the out of band emissions is one of these problems. Ensuring low out of band emission (OOBE) is deemed as one of the most critical challenges to support development of future technologies such as 6G and beyond. Universal Filtered Multi Carrier (UFMC) has been considered as one of the candidate waveforms for the 5G communications due to its robustness against Inter Carrier Interference (ICI) and the Inter Symbol Interference (ISI). It is also a preferred option because it is the most appropriate for low latency scenarios. In this paper, a novel approach is proposed that makes use of modified Kaiser-Bessel filter-based pulse windowing instead of standard Dolph-Chebyshev filter for UFMC based waveform. The aim of proposing the new approach is to enable the reduction of spectral leakage into nearby sub-bands. A comprehensive study for the modified Kaiser-Bessel filters is performed and the results are presented in terms of several Key Performance Indicators (KPIs). Based on the results of the simulation, the UFMC Kaiser-Hankel window demonstrated lower sidebands and better power spectral density, when compared with the traditional Orthogonal frequency-division multiplexing (OFDM) and UFMC as well as the normal UFMC Kaiser window. In addition, the real test for the kaiser window with 5G waveform is lower OOBE than conventional 5G waveform (CP-OFDM and UFMC). The OOBE reduction of 31% of the Kaiser vs. the Dolph-Chebyshev filter, 68% of Kaiser Hankel over the Dolph-Chebyshev, and 20% of Kaiser Hankel over Kaiser filter have been reported in this paper. The Power Spectral Density has been improved accordingly.

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Section: Ufmc Architecturementioning

confidence: 99%

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

Hammoodi¹,

Audah²,

Al-Jobouri³

et al. 2022

Computers, Materials &Amp; Continua

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Frequency Domain Multi-Carrier Modulation Based on Prolate Spheroidal Wave Functions

Wang

Liu

et al. 2020

IEEE Access

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A novel frequency domain multi-carrier modulation (MCM-FD) scheme is proposed based on prolate spheroidal wave functions (PSWFs) for reducing the high complexity in the conventional time domain PSWFs multi-carrier modulation (MCM-PSWFs-TD) schemes. By constructing the relationship between discrete representation and exponential function representation of MCM-PSWFs-TD signals, it can be observed that the orthogonality and parity symmetry of the waveforms of PSWFs in the frequency domain are the same as that in the time domain. Thus, the PSWFs signal can be divided into two groups based on their parity symmetry, while these two groups of PSWFs signals can be processed simultaneously. Based on this concept, signal waveforms with only half spectrum range are invoked in the process of information loading and signal detection for reducing the number of sampling points participated in the signal operation. Compared to the MCM-PSWFs-TD scheme, the proposed MCM-PSWFs-FD scheme is capable of significantly reducing the computational complexity without severely degrading the system performance, such as spectral efficiency (SE), bit error rate performance, signal energy concentration and peak-to-average power ratio (PAPR). Furthermore, the cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM), OFDM with weighted overlap and add (WOLA-OFDM), filter OFDM (F-OFDM), universal filtered multi-carrier (UFMC), as well as the filter bank multi-carrier with offset quadrature amplitude modulation (FBMC-OQAM) are also demonstrated as benchmarks. Simulation results are provided for illustrating that the proposed MCM-PSWFs-FD scheme is capable of striking a favorable tradeoff between the computational complexity and the system performance (i.e. SE, out-of-band energy leakage, adjacent frequency band interference, and PAPR), while the signal waveform design of the MCM-PSWFs-FD scheme is also more concise and flexible than the benchmarks. INDEX TERMS Prolate spheroidal wave functions, multi-carrier modulation, waveform design, timefrequency resource allocation, spectral efficiency. HONGXING WANG received the B.Eng. degree in telecommunication from the Chengdu Telecommunication Engineering Institute, China, in 1982, the M.Eng. degree in communication and electronic system from Naval Aeronautical and Astronautical Engineering University, China, in 1990, and the Ph.D. degree in communication and information systems from Beijing Aeronautical and Astronautical University, China, in 2007. He is currently a Full Professor and a Ph.D. Supervisor with the Department of Aeronautical Communication, Naval Aviation University, China. His research interests include modern multicarrier communication systems, digital signal processing, optical wireless communications, and 5G wireless networks.

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