Adaptive filtered OFDM with regular resource grid

Weitkemper, Petra; Bazzi, Jamal; Kusume, Katsutoshi; Benjebbour, Anass; Kishiyama, Yoshihisa

doi:10.1109/iccw.2016.7503830

Cited by 11 publications

(7 citation statements)

References 8 publications

(12 reference statements)

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“…The main objective of adding the filter to the transmitter is to restrain the high OOBE level of the OFDM system to support the asynchronous transmission and to decrease the latency [26]. Thereby, the spectral efficiency is enhanced, and this enables the system to achieve the 5G technology requirements.…”

Section: Frequency Division Multiplexingmentioning

confidence: 99%

Improving PAPR performance of filtered OFDM for 5G communications using PTS

et al. 2020

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The filtered orthogonal frequency division multiplexing (F-OFDM) system has been recommended as a waveform candidate for fifth-generation (5G) communications.The suppression of out-of-band emission (OOBE) and asynchronous transmission are the distinctive features of the filtering-based waveform frameworks. Meanwhile, the high peak-to-average power ratio (PAPR) is still a challenge for the new waveform candidates. Partial transmit sequence (PTS) is an effective technique for mitigating the trend of high PAPR in multicarrier systems. In this study, the PTS technique is employed to reduce the high PAPR value of an F-OFDM system. Then, this system is compared with the OFDM system. In addition, the other related parameters such as frequency localization, bit error rate (BER), and computational complexity are evaluated and analyzed for both systems with and without PTS. The simulation results indicate that the F-OFDM based on PTS achieves higher levels of PAPR, BER, and OOBE performances compared with OFDM. Moreover, the BER performance of F-OFDM is uninfluenced by the use of the PTS technique.

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Section: Frequency Division Multiplexingmentioning

confidence: 99%

Improving PAPR performance of filtered OFDM for 5G communications using PTS

et al. 2020

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“…When the filter length is shorter, the ISI can be avoided by zero padding without losing too much information. However, the shorter filter impulse response leads to higher out-ofband (OoB) radiation [12], [13]. At the same time, for a longer filter impulse response, the ISI cannot be completely avoided but can reduce the OoB radiation.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the Two-Piecewise Linear Companding Technique on Filtered-OFDM Systems

2021

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Filtered orthogonal frequency division multiplexing (F-OFDM) is one of the most prominent waveform candidates when it comes to fifth-generation (5G) wireless communication and beyond. This paper analyzes the performance of the F-OFDM system in terms of the peak-to-average power ratio (PAPR) and bit error rate (BER). The F-OFDM system exhibits a high PAPR, which introduces earnest deterioration in its performance. Consequently, an efficient PAPR-reduction technique has been recommended to reduce the effect of the high value of PAPR of the F-OFDM system. The prospective two-piecewise companding (TPWC) scheme effectively reduces the peak power by analyzing large and small amplitudes individually, so its outcome has both piecewise linear and continuous characteristics. The performances of different PAPR reduction techniques are compared in terms of PAPR complementary cumulative distribution functions and BERs. It is shown that the proposed TPWC transform can significantly reduce PAPR with reduced computational complexity compared with conventional companding techniques.INDEX TERMS Peak-to-average power ratio (PAPR), Companding techniques, Filtered-OFDM, Two-Piece-wise linear companding technique, 5G

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“…The only drawback is that different carrier spacing is not taken into consideration which would not describe the characteristic of F-OFDM completely. If adjacent users employ different carrier spacing, it is better to consider whether guard bands are needed [32]. Although the bit error rate affected by the relative position between users has been analyzed, quantitative analysis still needed.…”

Section: Introductionmentioning

confidence: 99%

Interference Analysis and Filter Parameters Optimization for Uplink Asynchronous F-OFDM Systems

Yang

Chen

2019

IEEE Access

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Filtered-orthogonal frequency division multiplexing (F-OFDM) is a candidate for 5G new waveform, which has flexible numerologies to support various scenarios and can combat interference of multi-users effectively with filters. However, although longer filter length and higher roll-off factor can suppress out of band radiation, inter-symbol interference (ISI) and inter-carrier interference (ICI) will increase at the same time. Meanwhile, the wider guard band reduce inter-user interference (IUI) at the cost of higher spectrum occupancy. To meet target bit error rate (BER) requirements of all users and maximize the spectrum efficiency, a filter parameter and guard bandwidth optimization model was proposed to design related parameters dynamically for uplink asynchronous F-OFDM system, where users are allocated with different numerologies. We present a detailed theoretical derivation on ISI, ICI, and IUI for BER calculation, and the theoretical derivation of IUI in multi-user scenario with different subcarrier spacing between users is first presented. The formulated problem is proved to be a non-convex NP hard problem and Imperialist Competitive Algorithm (ICA) is applied for a desirable solution. The simulation results show that the theoretical derivations are valid and the proposed filter parameter and guard bandwidth optimization model can achieve higher spectrum efficiency than the fixed filter parameters in F-OFDM while outperforms traditional OFDM.INDEX TERMS Filtered-orthogonal frequency division multiplexing (F-OFDM), interference analysis, spectrum efficiency, multi-numerologies. MEIJIE YANG received the B.S. degree from the University of Science and Technology Beijing, China, in 2016, where she is currently pursuing the Ph.D. degree. Her research interests mostly include physical layer, advanced waveforms techniques, and signal processing for 5G systems. YUEYUN CHEN received the bachelor's degree from the South China University of Technology and the master's and Ph.D. degrees from Beijing Jiaotong University. She is currently a Professor with the School of Computer and Communication Engineering, University of Science and Technology Beijing, China. Her current research interests include wireless and mobile communications, including MIMO, communication signal processing, radio resource management, cognitive radio, cooperative communications, and optimization theory on communications. LIPING DU received the B.E. degree in industrial automation and the M.Sc. degree in physical sci-

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Adaptive filtered OFDM with regular resource grid

Cited by 11 publications

References 8 publications

Improving PAPR performance of filtered OFDM for 5G communications using PTS

Improving PAPR performance of filtered OFDM for 5G communications using PTS

Performance Analysis of the Two-Piecewise Linear Companding Technique on Filtered-OFDM Systems

Interference Analysis and Filter Parameters Optimization for Uplink Asynchronous F-OFDM Systems

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