A proposed preamble based channel estimation method for FBMC in 5G wireless channels

AboulDahab, Mohammed A.; Fouad, Moharram; Roshdy, Radwa A.

doi:10.1109/nrsc.2018.8354382

Cited by 16 publications

(17 citation statements)

References 15 publications

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“…It is defined as the probability that PAPR exceeds some threshold value that is denoted by (PAPR0). PAPR0 is a random variable (R.V), of which lower values indicate better performance [22]. Fig.…”

Section: B Simulation Resultsmentioning

confidence: 99%

Generalized Discrete Fourier Transform for FBMC Peak to Average Power Ratio Reduction

2019

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Filter bank multicarrier (FBMC) is a strong candidate as a waveform based technique in advanced wireless communication systems (e.g. 5G), as an alternative to orthogonal frequency division multiplexing (OFDM). Like all multicarrier modulation techniques, FBMC suffers from high levels of a peak-to-average power ratio (PAPR). Discrete Fourier transform (DFT) spreading can be used in FBMC for PAPR reduction with a quite notable increase in computational complexity and without any need for side information (SI) overhead at the receiver. However, the achieved PAPR reduction is of a marginal amount, compared to the single carrier effect in the single carrier frequency division multiple access (SC-FDMA). This is due to the in-phase and quadrature phase (IQ) overlapping structure between offset quadrature amplitude modulation (OQAM) FBMC symbols. In this paper, we propose the use of generalized DFT (GDFT) spreading as an alternative to DFT spreading for PAPR reduction in systems employing FBMC. We derive the conditions at which the GDFT can totally make use of the single carrier effect of DFT spreading and hence reducing the PAPR. We also propose an enhancement algorithm that is utilized in the GDFT for further PAPR reduction without any additional complexity overhead. From the simulation results that are run at different values of subcarriers, it is shown that the GDFT spreading with the enhancement algorithm (enhanced GDFT) attain an extra amount of PAPR reduction over the other DFT spreading techniques. In addition, the GDFT spreading technique and the enhanced one also show better power spectral density (PSD) over the other DFT spreading techniques.INDEX TERMS Filter bank multicarrier (FBMC), DFT spreading, single carrier effect, generalized DFT, PAPR reduction. FIGURE 9. PAPR's CCDF of the enhanced GDFT spreading versus FBMC DFT spreading techniques with M = 64. FIGURE 10. PAPR's CCDF of the enhanced GDFT spreading versus FBMC DFT spreading techniques with M = 128.

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Section: B Simulation Resultsmentioning

confidence: 99%

Generalized Discrete Fourier Transform for FBMC Peak to Average Power Ratio Reduction

2019

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“…where C 0 is the covariance matrix of n 0 provided by (17). Moreover, (21) implies that the MSE of H LS−M T CE is equal to tr{M LS−M T CE }.…”

Section: B Ls-based Multi-tap Channel Estimation (Ls-mtce)mentioning

confidence: 99%

Multi-Tap Channel Estimation for Preamble-Based FBMC/OQAM Systems

Ren

Zhang

et al. 2020

IEEE Access

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The intrinsic imaginary inter-carrier/inter-symbol interference in filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) systems makes accurate channel estimation remain an open issue, which motivates our work in this paper. In order to improve the channel estimation performance for preamble-based FBMC/OQAM systems, a recursive least squares (RLS)-based multi-tap channel estimation (RLS-MTCE) scheme that can effectively reduce the influence of noise is proposed by adopting the widely used signal model of the analysis filter bank (AFB) output. On the other hand, by utilizing the new-built signal model of the AFB output, the authors develop least squares (LS)-based and minimum mean square error (MMSE)-based multi-tap channel estimation schemes, denoted by LS-MTCE and MMSE-MTCE, respectively, to accurately exploit the interference to improve the channel estimation performance. The complexity and performance analysis results show that, compared with the existing schemes, the proposed RLS-MTCE, LS-MTCE and MMSE-MTCE counterparts generally achieve a lower estimation error at the cost of an acceptable increase in computational complexity. INDEX TERMS Channel estimation, FBMC/OQAM, least squares (LS), minimum mean square error (MMSE), multi-tap.

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“…CoMP (uplink coordinated multipoint) scenarios have also been realised with UFMC. Reference [6] When it comes to frequency division multiplexing (FBMC), [7] the UFMC approach can be seen as an in-between method between OFDM and the more robust FBMC. Reference [8] Power amplifier amplification efficiency is measured by the PAPR.…”

Section: Introductionmentioning

confidence: 99%

Selective Mapping Scheme for Universal Filtered Multicarrier

Madhusudhan¹,

Sharma²

2023

Intelligent Automation &Amp; Soft Computing

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The next step in mobile communication technology, known as 5G, is set to go live in a number of countries in the near future. New wireless applications have high data rates and mobility requirements, which have posed a challenge to mobile communication technology researchers and designers. 5G systems could benefit from the Universal Filtered Multicarrier (UFMC). UFMC is an alternate waveform to orthogonal frequency-division multiplexing (OFDM), in filtering process is performed for a sub-band of subcarriers rather than the entire band of subcarriers Inter Carrier Interference (ICI) between neighbouring users is reduced via the sub-band filtering process, which reduces out-of-band emissions. However, the UFMC system has a high Peak-to-Average Power Ratio (PAPR), which limits its capabilities. Metaheuristic optimization based Selective mapping (SLM) is used in this paper to optimise the UFMC-PAPR. Based on the cognitive behaviour of crows, the research study suggests an innovative metaheuristic optimization known as Crow Search Algorithm (CSA) for SLM optimization. Compared to the standard UFMC, SLM-UFMC system, and SLM-UFMC with conventional metaheuristic optimization techniques, the suggested technique significantly reduces PAPR. For the UFMC system, the suggested approach has a very low Bit Error Rate (BER).

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A proposed preamble based channel estimation method for FBMC in 5G wireless channels

Cited by 16 publications

References 15 publications

Generalized Discrete Fourier Transform for FBMC Peak to Average Power Ratio Reduction

Generalized Discrete Fourier Transform for FBMC Peak to Average Power Ratio Reduction

Multi-Tap Channel Estimation for Preamble-Based FBMC/OQAM Systems

Selective Mapping Scheme for Universal Filtered Multicarrier

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