Optimal Input Power Backoff of a Nonlinear Power Amplifier for SEFDM System

Fadeev, Dmitrii K.; Rashich, Andrey

doi:10.1007/978-3-319-23126-6_60

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…The overview of the theoretical studies on wireless and optical communications are listed in Table I and Table II. Various signal generation approaches and developed signal [66] Soft cancellation MMSE Turbo equalization for n-OFDM Sep. 2013 [67] Frequency packing for spectral coexistence in satellite scenario Oct. 2013 [68] An improved FSD detector using iterative soft decision method 2013 [69] Gabor transform to reduce the receiver side complexity 2014 [70] BER performance improvement using smoothed envelope signals May 2015 [71] Asymptotically optimal algorithm was studied Aug. 2015 [72] Nonlinear distortions caused by power amplifiers were studied Aug. 2015 [49] Optimum envelope forms were studied Oct. 2015 [21] The achievable capacity of SEFDM was studied Oct. 2015 [73] Optimization of envelope forms for the duration of the signals 2015 [74] Mitigation of aliasing and inter carrier interference (ICI) using ASK-manipulated signals Jun. 2016 [31] Reduced complexity PAPR reduction algorithm for SEFDM Oct. 2016 [75] Comparison study of sinc pulse and RRC pulse Oct. 2016 [76] fractional Hartley transform for SEFDM Dec. 2016 [77] Index modulation was applied to SEFDM Dec. 2016 [29] Improve spectral and energy efficiency employing optimal envelope May 2017 [78] Peak to average power ratio suppression study Jun.…”

Section: Tabulated Summary Of Sefdm Key Papersmentioning

confidence: 99%

The First 15 Years of SEFDM: A Brief Survey

Darwazeh

Ghannam

2018

2018 11th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

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Spectrally efficient frequency division multiplexing (SEFDM) is a multi-carrier signal waveform, which achieves higher spectral efficiency, relative to conventional orthogonal frequency division multiplexing (OFDM), by violating the orthogonality of its sub-carriers. This survey provides the history of SEFDM development since its inception in 2003, covering fundamentals and concepts, wireless and optical communications applications, circuit design and experimental testbeds. We focus on work done at UCL and outline work done other universities and research laboratories worldwide. We outline techniques to improve the performance of SEFDM and its practical utility with focus on signal generation, detection and channel estimation.

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Section: Tabulated Summary Of Sefdm Key Papersmentioning

confidence: 99%

The First 15 Years of SEFDM: A Brief Survey

Darwazeh

Ghannam

2018

2018 11th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

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“…It is worth noting that SEFDM has been studied in different research directions. Work in [33] investigated the effect of nonlinear distortions caused by power amplifiers on SEFDM. The authors of [25] found that the bandwidth compression issue in SEFDM can be optimized using signals with optimum envelope forms, which have low out-of-band power emission.…”

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confidence: 99%

Transmission Experiment of Bandwidth Compressed Carrier Aggregation in a Realistic Fading Channel

Darwazeh

2017

IEEE Trans. Veh. Technol.

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In this paper, an experimental testbed is designed to evaluate the performance of a bandwidth compressed multicarrier technique termed spectrally efficient frequency division multiplexing (SEFDM) in a carrier aggregation (CA) scenario 1 . Unlike orthogonal frequency division multiplexing (OFDM), SEFDM is a non-orthogonal waveform which, relative to OFDM, packs more sub-carriers in a given bandwidth, thereby improving spectral efficiency. CA is a long term evolution-advanced (LTE-Advanced) featured technique that offers a higher throughput by aggregating multiple legacy radio bands. Considering the scarcity of radio spectrum, SEFDM signals can be utilized to enhance CA performance. The combination of the two techniques results in a larger number of aggregated component carriers (CCs) and therefore increased data rate in a given bandwidth with no additional spectral allocation. It is experimentally shown that CA-SEFDM can aggregate up to 7 CCs in a limited bandwidth while CA-OFDM can only put 5 CCs in the same bandwidth. In this work, LTE-like framed CA-SEFDM signals are generated and delivered through a realistic LTE channel. A complete experimental setup is described together with error performance and effective spectral efficiency comparisons. Experimental results show that the measured BER performance for CA-SEFDM is very close to CA-OFDM and the effective spectral efficiency of CA-SEFDM can be substantially higher than that of CA-OFDM.

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“…A marked contribution of improving spectral efficiency was proposed in 1975 by Mazo [1], where it was proven that, in a single-carrier scenario, a 25% gain in spectral efficiency can be achieved at the same bit error rate (BER) and energy per bit (E b ). In 2003, a multi-carrier system, termed spectrally efficient frequency division multiplexing (SEFDM) [2], [3], which improves spectral efficiency by getting the sub-carriers closer while compromising the orthogonality compared to orthogonal frequency division multiplexing (OFDM) was reported and shown to have advantages in achieving capacity gains [4], [5], choice of signal shapes and power levels [6], [7] and in coexisting with other systems [8]. Other techniques were proposed to improve spectral efficiency by suppressing the out-of-band power level, such as; generalized frequency di-T. Xu, H. Ghannam vision multiplexing (GFDM) [9], filterbank based multicarrier (FBMC) [10] and universal-filtered multi-carrier (UFMC) [11].…”

Section: Introductionmentioning

confidence: 99%

Practical Evaluations of SEFDM: Timing Offset and Multipath Impairments

Xu¹,

Ghannam²,

Darwazeh³

2018

Infocommunications journal

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The non-orthogonal signal waveform spectrally efficient frequency division multiplexing (SEFDM) improves spectral efficiency at the cost of self-created inter carrier interference (ICI). As the orthogonal property, similar to orthogonal frequency division multiplexing (OFDM), no longer exists, the robustness of SEFDM in realistic wireless environments might be weakened. This work aims to evaluate the sensitivity of SEFDM to practical channel distortions using a professional experiment testbed. First, timing offset is studied in a bypass channel to locate the imperfection of the testbed and its impact on SEFDM signals. Then, the joint effect of a multipath frequency selective channel and additive white Gaussian noise (AWGN) is investigated in the testbed. Through practical experiments, we demonstrate the performance of SEFDM in realistic radio frequency (RF) environments and verify two compensation methods for SEFDM. Our results show first frequency-domain compensation works well in frequency non-selective channel conditions while time-domain compensation method is suitable for frequency selective channel conditions. This work paves the way for the application of SEFDM in different channel scenarios.

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Optimal Input Power Backoff of a Nonlinear Power Amplifier for SEFDM System

Cited by 14 publications

References 6 publications

The First 15 Years of SEFDM: A Brief Survey

The First 15 Years of SEFDM: A Brief Survey

Transmission Experiment of Bandwidth Compressed Carrier Aggregation in a Realistic Fading Channel

Practical Evaluations of SEFDM: Timing Offset and Multipath Impairments

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