Low‐complexity frequency‐domain turbo equalisation for doubly‐selective HF channel on GPP‐based SDR platform

Ravaei, Yahya; Nejad, Mohammad Mahdi; Madani, Mohammad Hossein

doi:10.1049/iet-com.2017.0021

Cited by 3 publications

(4 citation statements)

References 15 publications

(16 reference statements)

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“…There are various approaches to IBI cancellation in overlap FDE, either with serial decision feedback for joint ISI/IBI cancellation [52], with hard decision feedback for successive IBI cancellation [53], or with hybrid turbo and hard successive decision feedback [49]. Unlike these references, which uses decisions on previously processed sub-blocks, here we focus on parallel IBI cancellation, using solely a feedback generated from the previous SI/TI, for ensuring parallel processing of sub-blocks in practical implementations.…”

Section: Overlap Fde With Interference Cancellationmentioning

confidence: 99%

“…This strategy inherently generates IBI between sub-blocks, which is mitigated either by selecting an appropriate sub-block length N , or by using additional signal processing. Some recent usage examples include its usage with faster-than-Nyquist signalling [48], and with doubly selective channels [49]. In this section, various EP-based overlap FDE receivers are derived and evaluated.…”

Section: A System Modelmentioning

confidence: 99%

“…As in overlap FDE NI/IR strategies above, N b parallel equalizers are operated concurrently for detecting all sub-blocks. Finally, it is possible, depending on the channel coherence time, to set N l = N r = 0, for τ > 0, to reduce N b , as in [49], to reduce the receiver complexity.…”

Section: Overlap Fde With Interference Cancellationmentioning

confidence: 99%

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A Framework for Iterative Frequency Domain EP-Based Receiver Design

Sahin

Cipriano

Poulliat

et al. 2018

IEEE Trans. Commun.

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An original expectation propagation (EP) based message passing framework is introduced, wherein transmitted symbols are considered to belong to the multivariate white Gaussian distribution family. This approach allows deriving a novel class of single-tap frequency domain (FD) receivers with a quasi-linear computational complexity in block length, thanks to Fast-Fourier transform (FFT) based implementation. This framework is exposed in detail, through the design of a novel double-loop single-carrier frequency domain equalizer (SC-FDE), where self-iterations of the equalizer with the demapper, and turbo iterations with the decoder, provide numerous combinations for the performance and complexity trade-off. Furthermore, the flexibility of this framework is illustrated with the derivation of an overlap FDE, used for time-varying channel equalization, among others, and with the design of a FD multiple-input multiple-output (MIMO) detector, used for spatial multiplexing. Through these different receiver design problems, this framework is shown to improve the mitigation of inter-symbol, inter-block and multi-antenna interferences, compared to alternative singletap FD structures of previous works. Thanks to finite-length and asymptotic analysis, supported by numerical results, the improvement brought by the proposed structures is assessed, and then completed by also accounting for computational costs.

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Section: Overlap Fde With Interference Cancellationmentioning

confidence: 99%

Section: A System Modelmentioning

confidence: 99%

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A Framework for Iterative Frequency Domain EP-Based Receiver Design

Sahin

Cipriano

Poulliat

et al. 2018

IEEE Trans. Commun.

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“…To directly estimate the time domain signal distortion induced by the HPA, signal‐to‐noise ratio (SDR) evaluation is introduced in this section as follows:

\begin{equation} \operatorname{SDR}{\left({x} \right)}=10\lg {\left\lbrace \frac{\alpha \operatorname{E}{\left({{{\left| {{\mathbf {x}}_{t}}{\left[ n \right]} \right|}}^{2}} \right)}}{\operatorname{E}{\left({{{\left| {{{\mathbf {\bar{x}}}}_{t}}{\left[ n \right]}-{{\mathbf {x}}_{t}}{\left[ n \right]} \right|}}^{2}} \right)}} \right\rbrace} , \end{equation}

where

{{\mathbf {x}}_{t}}[ n ]

is the original time frequency signal,

{{\mathbf {\bar{x}}}_{t}}[ n ]

is the time domain signal amplified by HPA without demodulation. SDR is relevant to modulated signal quality, defined in broadband and contains out‐of‐band and in‐band noise statistics, while MER solely measures in‐band noise [43].…”

Section: Proposed Hpa Energy Efficiency Maximization Scheme Applied W...mentioning

confidence: 99%

Continuous unconstrained PSO‐PTS strategy to maximize HPA energy efficiency for FBMC‐OQAM systems

Jin

et al. 2023

IET Communications

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In filter bank multi‐carrier (FBMC) with offset quadrature amplitude modulation (OQAM) systems, the major limitation of FBMC‐OQAM signaling is the high peak‐to‐average power ratio (PAPR). High PAPR results in increased hardware complexity and is also prone to non‐linear effects of high‐power amplifiers (HPA). The existing HPA energy‐efficient optimization strategies are constrained severely by the scarcity and heterogeneity of signal distribution in the degree of freedom. This paper theorizes the optimal FBMC‐OQAM signal distribution, which has a global and steady feature and evaluates the maximal HPA efficiency‐suited multi‐carrier modulation (MCM) signal. This paper first proposes that the Binary Particle Swarm Optimization based Partial Transmit Sequence (BPSO‐PTS) with the Input‐Back Off Modulation Error Ratio (IBO‐MER) scheme traces the signal distribution for maximal HPA efficiency to save supply‐side energy. This paper further proposes Continuous‐Unconstrained Particle Swarm Optimization based PTS(CUPSO‐PTS) with IBO‐MER to obtain the theoretical boundaries and drastically accelerate convergence in the continuous‐unconstrained searching space. To decrease the computational complexity of MER calculation, this paper proposes the CUPSO with IBO Signal‐to‐Distortion Ratio (IBO‐SDR), enabling it to meet more practical applications. The simulation results show that the proposed scheme outperforms conventional IBO and HPA efficiency schemes.

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