Block frequency spreading: A method for low-complexity MIMO in FBMC-OQAM

Nissel, Ronald; Blumenstein, Jiří; Rupp, Markus

doi:10.1109/spawc.2017.8227812

Cited by 20 publications

(30 citation statements)

References 12 publications

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“…where r q 0 ,l [n] denotes the received symbol (after the DFT) at time instant n and with i ISIk = 0 if N CP ≥ K/δ − 1 and otherwise (22). Consequently, perfect reconstruction can be ensured as long as the cyclic prefix length satisfies the condition (20). Otherwise, the orthogonality property is broken and interference is generated.…”

Section: ) Receiver Schemementioning

confidence: 99%

“…For the 64-subband configurations, the value of delta is reduced and therefore the considered CP length, 9, is not high enough to prevent ISI in time. That is why intrinsic interference is generated over time according to (15) and (20). Regarding the ICI, intrinsic interference is spread over the whole band with BF-OFDM because of the FFT-based receiver scheme while it is contained in a subband with FFT-FBMC thanks to its subband processing.…”

Section: A Near-orthogonality Propertymentioning

confidence: 99%

“…Nevertheless, the scheme still relies on an OQAM transmission and it has been observed that only half the filter bank carriers can be used. The idea has been improved in [20] where the orthogonality of a filter-bank is ensured by applying Hadamard codes. However, the latter suffers from high Inter-Symbol Interference (ISI) when moderate/high channel delay spreads are considered.…”

Section: Introductionmentioning

confidence: 99%

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Study of OFDM Precoded Filter-Bank Waveforms

Demmer

Zakaria

Gerzaguet³

et al. 2019

IEEE Trans. Wireless Commun.

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Forthcoming wireless systems will have to cope with a heterogeneous and dense traffic. High demands in terms of bandwidth use efficiency and increased flexibility are therefore required for the related air-interface technology. In this context, Filter-Bank MultiCarrier with Offset QAM (FBMC/OQAM) waveform has been recognized as an enabling technology providing strong assets with a well confined spectrum and enhanced spectral efficiency with respect to Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM). Nonetheless, FBMC-OQAM presents a few challenges to overcome: the intrinsic interference must be taken into consideration in the channel estimation processes and multiple antenna schemes design. Those challenges are induced by the reduction of the orthogonality property to the real field. In this paper, OFDM precoding/decoding is proposed as an alternative to the OQAM signaling for filter-bank based waveforms. The OFDM precoding makes the waveforms near-complex orthogonal which enables a straightforward adaptation to channel estimation techniques and MIMO scheme design. Two waveforms based on this precoding, namely Fast Fourier Transform FBMC (FFT-FBMC) and Block Filtered OFDM (BF-OFDM), have been proposed. A common framework is proposed to study the two waveforms. The paper also investigates changing the time structure of the transmitted signal by introducing the rate factor parameter. It is shown that intrinsic interference can be greatly reduced at the price of a slight side-lobe increase.

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Section: ) Receiver Schemementioning

confidence: 99%

Section: A Near-orthogonality Propertymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of OFDM Precoded Filter-Bank Waveforms

Demmer

Zakaria

Gerzaguet³

et al. 2019

IEEE Trans. Wireless Commun.

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“…The authors in [75], [76] introduced a very effective solution to recover complex orthogonality in FBMC by spreading data symbols in frequency or time. These techniques enable to apply of all MIMO methods that may be used in OFDM to FBMC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of FBMC/OQAM Systems Based on Pulse Shaping Filters

2020

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Cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) is the most widespread multicarrier modulation scheme. However, the use of a rectangular filter in CP-OFDM causes poor outof-band (OoB) radiation. Moreover, the CP causes spectral efficiency loss. To overcome these limitations, a filter bank multicarrier (FBMC) was proposed which uses prototype pulse shaping filters that can be adapted to fulfil the system requirements. The choice of the filter is crucial for FBMC/offset quadrature amplitude modulation (OQAM) due to its significant impact on the achieved performance. In this paper, new prototype pulse shaping filters in FBMC/OQAM systems are proposed, aiming to improve the system performance. A number of prototype pulse shaping filters, such as raised cosine pulse (RC), root raised cosine pulse (RRC), better than raised cosine pulse (BTRC), modified Bartlett-Hanning (MBH), improved sinc power pulse (ISP), phase modified sinc pulse (PMSP), parametric linear pulse (PLP), linear combination pulse (LCP), PHYDYAS and Hermite, are considered. The performance of each pulse shaping filter in FBMC/OQAM is evaluated and compared other in terms of the power spectral density (PSD), spectral efficiency, signal-to-interference ratio (SIR), time offset (TO), carrier frequency offset (CFO) and bit error rate (BER) performance over various channels. In addition, as multiple input multiple output (MIMO) is one of the main challenges associated with FBMC, we propose the new approach that use the frequency/time block spreading based on a Walsh-Hadamard (WH) code in MIMO FBMC/OQAM and investigate the combination of the our proposed prototype pulse shaping filters with MIMO systems. The proposed filters are shown to be suitable candidates for FBMC/OQAM systems.

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“…This shortcoming of FBMC/OQAM also makes channel estimation and MIMO integration challenging. Therefore, in this work we use a low-complexity modified FBMC/OQAM system as proposed in [9] where complex symbols can be either spread in time or frequency [10] to eliminate the imaginary interference. We assess the performance of the Turbo-coded The rest of this paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

MU-Massive MIMO for UWA Communication

Bocus

Doufexi

Agrafiotis

2018

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

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The present paper considers the application of massive multiple-input multiple-output (MIMO) to a multiuser (MU) underwater acoustic (UWA) communication system. In the scope to achieve a high throughput within a limited acoustic bandwidth, we consider filterbank multicarrier (FBMC) modulation for waveform shaping instead of the widely used orthogonal frequency division multiplexing (OFDM). We assess the performance of the system in a 1 km simulated time-varying underwater acoustic channel (UAC) in terms of bit error rate (BER), packet error rate (PER) and maximum achievable throughput. The transmission scenario consists of four users, each one equipped with multiple transmitting hydrophones. We show that the implementation of massive MIMO at the receiver allows all the users to use the same frequency bandwidth to transmit their information reliably to the receiver. Therefore, a high spectral efficiency and throughput can be achieved, making the transmission of multimedia data such as high quality real-time video a reality.

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Block frequency spreading: A method for low-complexity MIMO in FBMC-OQAM

Cited by 20 publications

References 12 publications

Study of OFDM Precoded Filter-Bank Waveforms

Study of OFDM Precoded Filter-Bank Waveforms

Evaluation and Analysis of FBMC/OQAM Systems Based on Pulse Shaping Filters

MU-Massive MIMO for UWA Communication

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