FBMC-based air interface for 5G Mobile: Challenges and proposed solutions

Schellmann, Malte; Zhao, Zhao; Lin, Hao; Siohan, Pierre; Rajatheva, Nandana; Luecken, Volker; Ishaque, Aamir

doi:10.4108/icst.crowncom.2014.255708

Cited by 91 publications

(56 citation statements)

References 20 publications

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“…Apart from its main advantage of significantly reduced out-ofband emission in comparison to the widely used orthogonal frequency division multiplexing (OFDM) system [1], [2], [6]; another major benefit is ease in the implementation of multi-user (MU) access in the uplink transmission since the strict synchronization requirements for OFDM systems can be relaxed in FBMC systems [7], [8]. In addition, it has been reported in [9] that FBMC system is more robust to carrier frequency offset (CFO) [10], which is critical for this waveform when employed in high mobility environments and multi-cell cooperation scenarios [7], [11].…”

Section: Introductionmentioning

confidence: 99%

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FBMC System: An Insight into Doubly Dispersive Channel Impact

Zhang

Xiao

Zafar

et al. 2016

IEEE Trans. Veh. Technol.

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Abstract-It has been claimed that the filter bank multicarrier (FBMC) systems suffer from negligible performance loss caused by moderate dispersive channels in the absence of guard time protection between symbols. However, a theoretical and systematic explanation/analysis for the statement is missing in the literature to date. In this paper, based on one-tap minimum mean square error (MMSE) and zero-forcing (ZF) channel equalizations, the impact of doubly dispersive channel on the performance of FBMC systems is analyzed in terms of mean square error (MSE) of received symbols. Based on this analytical framework, we prove that the circular convolution property between symbols and the corresponding channel coefficients in the frequency domain holds loosely with a set of inaccuracies. To facilitate analysis, we first model the FBMC system in a vector/matrix form and derive the estimated symbols as a sum of desired signal, noise, inter-symbol interference (ISI), inter-carrier interference (ICI), inter-block interference (IBI) and estimation bias in the MMSE equalizer. Those terms are derived one-by-one and expressed as a function of channel parameters. The numerical results reveal that in harsh channel conditions, e.g., with large Doppler spread or channel delay spread, the FBMC system performance may be severely deteriorated and error floor will occur.

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Section: Introductionmentioning

confidence: 99%

“…However, it has been reported that a well designed prototype filter with moderate length (e.g. overlapping factor K = 4 ∼ 6) incurs negligible self-interference 1 [1], [6]. There have been some investigations in the literature on the dispersive channel induced interference in the form of ICI and/or ISI for FBMC systems.…”

Section: Introductionmentioning

confidence: 99%

FBMC System: An Insight into Doubly Dispersive Channel Impact

Zhang

Xiao

Zafar

et al. 2016

IEEE Trans. Veh. Technol.

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“…In addition, the large side lobes exhibited by the transmit signal make OFDM unsuitable when strict synchronization cannot be attained. The filter bank multicarrier modulation based on OQAM (FBMC/OQAM) is considered as an eligible candidate to substitute OFDM and become the air-interface of 5G networks [1]. The beauty of FBMC/OQAM is that subcarrier signals can be shaped with pulses that exhibit good time-frequency localization properties, while maximum bandwidth efficiency is achieved [2].…”

Section: Introductionmentioning

confidence: 99%

“…This has become the main obstacle to integrate FBMC/OQAM with multiple-inputmultiple-output (MIMO) communication systems [1]. The orthogonality issue is overcome by introducing the CP together with the adoption of the circular filtering [3], yet this entails wasting energy and losing spectral efficiency.…”

Section: Introductionmentioning

confidence: 99%

Towards a non-error floor multi-stream beamforming design for FBMC/OQAM

Caus

Pérez-Neira

Cheng

et al. 2015

2015 IEEE International Conference on Communications (ICC)

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Abstract-This paper investigates the application of filter bank multicarrier modulation based on the OQAM (FBMC/OQAM) to multiple-input-multiple-output (MIMO) systems. Existing solutions guarantee satisfactory performance when the streams multiplexed on each subcarrier (S) and the number of transmit (NT ) and receive (NR) antennas are related as S = min (NT , NR). When S < min (NT , NR), the techniques presented in previous works either exhibit an error floor or perform much worse than orthogonal frequency division multiplexing (OFDM). To make progress towards the combination of FBMC/OQAM with MIMO we propose a two-step approach and a coordinated beamforming algorithm to design the transmit and the receive processing. Numerical results show that the two-step method provides similar bit error rate (BER) as OFDM when S + 1 = NT = NR. Resorting to the coordinated beamforming solution, which is based on an iterative method, the application of FBMC/OQAM is extended to the general case S < min (NT , NR). Hence, the techniques presented in this paper demonstrate that FBMC/OQAM can achieve practically the same BER as OFDM with an increased spectral efficiency and a significantly decreased out-of-band radiation, which is an important advantage for non-contiguous spectrum allocations.

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“…Thus Staggered MultiTone (SMT) schemes like FBMC-OQAM, which utilize a critically sampled lattice grid [5], have been proposed for future wireless communication systems, e.g. 5th Generation (5G) cellular radio [6], [7]. In contrast to CP-OFDM, FBMC-OQAM allows the usage of arbitrary pulse shapes, which enables optimal adaptation of a transmission system to the actual channel conditions, thus preserving the maximum available channel capacity.…”

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confidence: 99%

Scattered Pilot-Based Channel Estimation for Channel Adaptive FBMC-OQAM Systems

Fuhrwerk

Moghaddamnia

Peissig

2017

IEEE Trans. Wireless Commun.

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Abstract-Shaping the pulse of FilterBank MultiCarrier with Offset Quadrature Amplitude Modulation subcarrier modulation (FBMC-OQAM) systems offers a new degree of freedom for the design of mobile communication systems. In previous studies, we evaluated the gains arising from the application of Prototype Filter Functions (PFFs) and subcarrier spacing matched to the delay and Doppler spreads of doubly dispersive channels. In this paper, we investigate the impact of having imperfect channel knowledge at the receiver on the performance of Channel Adaptive Modulation (CAM) in terms of channel estimation errors and Bit Error Rate (BER). To this end, the channel estimation error for two different interference mitigation schemes proposed in the literature is derived analytically and its influence on the BER performance is analyzed for practical channel scenarios. The results show that FBMC-OQAM systems utilizing CAM and scattered pilotbased channel estimation provide a significant performance gain compared with the current one system design for a variety of channel scenarios ("one-fits-all") approach. Additionally, we verified that the often used assumption of a flat channel in the direct neighborhood of a pilot symbol is not valid for practical scenarios.

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FBMC-based air interface for 5G Mobile: Challenges and proposed solutions

Cited by 91 publications

References 20 publications

FBMC System: An Insight into Doubly Dispersive Channel Impact

FBMC System: An Insight into Doubly Dispersive Channel Impact

Towards a non-error floor multi-stream beamforming design for FBMC/OQAM

Scattered Pilot-Based Channel Estimation for Channel Adaptive FBMC-OQAM Systems

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