A Framework for Iterative Frequency Domain EP-Based Receiver Design

An original expectation propagation-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-linea...

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Bibliographic Details
Published in:IEEE transactions on communications 2018-12, Vol.66 (12), p.6478-6493
Main Authors: Sahin, Serdar, Cipriano, Antonio Maria, Poulliat, Charly, Boucheret, Marie-Laure
Format: Article
Language:English
Subjects:
Accounting
Complexity
Computation
Computer Science
Decision feedback equalizers
Decoding
Equalization
expectation propagation
Fast Fourier transformations
Fourier transforms
Frequency domain analysis
frequency domain equalization
Gaussian distribution
Information Retrieval
Interference cancelation
Iterative decoding
Iterative methods
Message passing
Multiplexing
Normal distribution
Receivers
turbo equalization
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Summary:An original expectation propagation-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-based implementation. This framework is exposed in detail, through the design of a novel double-loop single-carrier FD equalizer (FDE), where self-iterations of the equalizer with the demapper and turbo iterations with the decoder provide numerous combinations for the performance and complexity tradeoff. 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 an FD multiple-input multiple-output 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 single-tap 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.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2018.2863724