Efficient Fast-Convolution Implementation of Filtered CP-OFDM Waveform Processing for 5G

Renfors, Markku; Yli‐Kaakinen, Juha; Levanen, Toni; Valkama, Mikko; Ihalainen, Tero; Vihriälä, Jaakko

doi:10.1109/glocomw.2015.7414034

Cited by 29 publications

(26 citation statements)

References 17 publications

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“…In addition, it also achieves comparable OoB emission as FBMC systems [5], [6], [7], [17]. Note that a fast-convolution implementation of multirate filter bank based waveform has been implemented and analyzed by transforming the filtering operation into the fast Fourier transform (FFT) domain [18], [19], with filtered cyclic prefix (CP) OFDM as a special case [20].…”

Section: Introductionmentioning

confidence: 99%

Subband Filtered Multi-Carrier Systems for Multi-Service Wireless Communications

Zhang

Ijaz

Xiao

et al. 2017

IEEE Trans. Wireless Commun.

118

114

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Abstract-Flexibly supporting multiple services, each with different communication requirements and frame structure, has been identified as one of the most significant and promising characteristics of next generation and beyond wireless communication systems. However, integrating multiple frame structures with different subcarrier spacing in one radio carrier may result in significant inter-service-band-interference (ISBI). In this paper, a framework for multi-service (MS) systems is established based on subband filtered multi-carrier system. The subband filtering implementations and both asynchronous and generalized synchronous (GS) MS subband filtered multi-carrier (SFMC) systems have been proposed. Based on the GS-MS-SFMC system, the system model with ISBI is derived and a number of properties on ISBI are given. In addition, low-complexity ISBI cancelation algorithms are proposed by precoding the information symbols at the transmitter. For asynchronous MS-SFMC system in the presence of transceiver imperfections including carrier frequency offset, timing offset and phase noise, a complete analytical system model is established in terms of desired signal, intersymbol-interference, inter-carrier-interference, ISBI and noise. Thereafter, new channel equalization algorithms are proposed by considering the errors and imperfections. Numerical analysis shows that the analytical results match the simulation results, and the proposed ISBI cancelation and equalization algorithms can significantly improve the system performance in comparison with the existing algorithms.Index Terms-multi-service multi-carrier system, inter-serviceband-interference, universal filtered multi-carrier, subband filtered multi-carrier, transceiver imperfection, generalized synchronization

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Section: Introductionmentioning

confidence: 99%

Subband Filtered Multi-Carrier Systems for Multi-Service Wireless Communications

Zhang

Ijaz

Xiao

et al. 2017

IEEE Trans. Wireless Commun.

118

114

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“…By targeting the issues associated with subband filtering-based waveforms, the FC-F-OFDM waveform was proposed in [12], [20]. Fast-convolution facilitates an efficient frequency-domain filtering and its combination with CP-OFDM waveforms brings significant advantages.…”

Section: State-of-the-art and Noveltymentioning

confidence: 99%

“…It should be noted that, in this work, overlap factor of λ = 1/2 is assumed as it provides good trade-off between performance and complexity [12], [20]. Then, conversion from time to frequency domain is realized by a L m -point DFT and frequency-domain subband based multirate filtering is applied.…”

Section: Waveform and Power Amplifier Modeling A Fc-f-ofdm Procmentioning

confidence: 99%

SDR Prototype for Clipped and Fast-Convolution Filtered OFDM for 5G New Radio Uplink

et al. 2020

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In wireless communications, higher transmission power enables higher coverage or higher data rate. However, due to hardware limitations, achieving high power efficiency becomes challenging. The main issue is that at high power region close to power amplifier (PA) saturation point the highly non-linear response of the PA leads to significant spectral regrowth. In such a case, waveforms with inherently good spectral containment allow for more spectral degradation and can be seen as the most effective solution for the problem. In this study, a fifth-generation new radio (5G NR) user equipment (UE) transmit power is improved by utilizing fast-convolution filtered orthogonal-frequency-division-multiplexing (FC-F-OFDM) waveform, which has an excellent spectral containment performance. A novel method is proposed for improving the peak-to-average-power ratio (PAPR) of FC-F-OFDM waveform, based on applying clipping before FC processing and allocating the clipping noise that stems from the applied clipping, over not only on active band, but a wider band consisting of both the in-band and guard-band regions. An accurate transmitter chain simulator including a measured memory-polynomial model of a practical PA is used to evaluate a wide set of different subcarrier spacings and channel bandwidths. Then, to validate the numerical results, a software-defined radio (SDR) based testbed is created and the modeled PA is used in this testbed. Weighted overlap-and-add (WOLA) based OFDM, also with clipping, is used as a reference in both the numerical evaluations and in measurements. For both waveforms, the transmitted signal quality, out-of-band emissions, and maximum PA output powers are measured under 5G NR specifications and results for different subcarrier spacings and channel bandwidths are provided to prove the benefits and robustness of the presented FC-F-OFDM approach. INDEX TERMS Fifth-generation new radio (5G-NR), fast convolution (FC), filtered OFDM, physical layer, prototype, software-defined radio (SDR), power amplifier (PA), weighted overlap-and-add (WOLA), peakto-average-power ratio (PAPR).

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“…Equation (4) represents the synthesis operations at the kth sub-band of the DWPT-BF-OFDM system. S N denotes the selection matrix selecting N samples from the inverse transformed output block, F N −1 denotes the IFFT matrix of dimensions N-by-N and P L m /2 L m /2 denotes the inverse Fourier shift matrix at the Tx side [14][15][16][17][18][19][20]. The matrix W′ m is a diagonal matrix with the frequencydomain values of the wavelet filter coefficients along its main diagonal.…”

Section: Wp-based Fc-f-ofdmmentioning

confidence: 99%

Cyclostationarity‐based joint sensing and equalisation of fast convolution‐based DWPT block‐filtered orthogonal frequency division multiplexing for fifth‐generation wireless systems

Datta

Lin

2018

IET Communications

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Efficient Fast-Convolution Implementation of Filtered CP-OFDM Waveform Processing for 5G

Cited by 29 publications

References 17 publications

Subband Filtered Multi-Carrier Systems for Multi-Service Wireless Communications

Subband Filtered Multi-Carrier Systems for Multi-Service Wireless Communications

SDR Prototype for Clipped and Fast-Convolution Filtered OFDM for 5G New Radio Uplink

Cyclostationarity‐based joint sensing and equalisation of fast convolution‐based DWPT block‐filtered orthogonal frequency division multiplexing for fifth‐generation wireless systems

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