Decoding strategies for physical-layer network coding over frequency selective channels

Uttam Bhat, Tolga M. Duman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

We investigate different decoding strategies at the relay over a frequency selective two-way relay channel with physical-layer network coding (PNC). The incorporation of the PNC scheme enables two users exchange information via a relay in two transmission phases. We study two approaches at the relay to decode the XOR of the transmitted codewords namely; a) an approximately optimal decoding scheme which is implemented using a list decoding algorithm, and b) a minimum mean square error (MMSE) based detector followed by a PNC decoder. The list decoding scheme selects L most likely pairs of sequences corresponding to the transmitted codewords and sorts them in the order of decreasing a-posteriori probabilities. From this list, estimates of the highly likely network coded sequences are obtained. Numerical examples show that a joint detector/physical-layer network coded sequence decoder (JD/PNCD) has a performance similar to the list decoding scheme and can be implemented with a lower complexity. The detection scheme based on the MMSE criterion is a suboptimal approach that generates soft information corresponding to the linear sum of the received symbols and is particularly useful in scenarios where the number of channel taps is large.

Original languageEnglish (US)
Title of host publicationIEEE Wireless Communications and Networking Conference, WCNC
Pages12-17
Number of pages6
DOIs
StatePublished - 2012
Event2012 IEEE Wireless Communications and Networking Conference, WCNC 2012 - Paris, France
Duration: Apr 1 2012Apr 4 2012

Other

Other2012 IEEE Wireless Communications and Networking Conference, WCNC 2012
CountryFrance
CityParis
Period4/1/124/4/12

Fingerprint

Network coding
Decoding
Mean square error
Detectors
Network layers

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Bhat, U., & Duman, T. M. (2012). Decoding strategies for physical-layer network coding over frequency selective channels. In IEEE Wireless Communications and Networking Conference, WCNC (pp. 12-17). [6213979] https://doi.org/10.1109/WCNC.2012.6213979

Decoding strategies for physical-layer network coding over frequency selective channels. / Bhat, Uttam; Duman, Tolga M.

IEEE Wireless Communications and Networking Conference, WCNC. 2012. p. 12-17 6213979.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bhat, U & Duman, TM 2012, Decoding strategies for physical-layer network coding over frequency selective channels. in IEEE Wireless Communications and Networking Conference, WCNC., 6213979, pp. 12-17, 2012 IEEE Wireless Communications and Networking Conference, WCNC 2012, Paris, France, 4/1/12. https://doi.org/10.1109/WCNC.2012.6213979
Bhat U, Duman TM. Decoding strategies for physical-layer network coding over frequency selective channels. In IEEE Wireless Communications and Networking Conference, WCNC. 2012. p. 12-17. 6213979 https://doi.org/10.1109/WCNC.2012.6213979
Bhat, Uttam ; Duman, Tolga M. / Decoding strategies for physical-layer network coding over frequency selective channels. IEEE Wireless Communications and Networking Conference, WCNC. 2012. pp. 12-17
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