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dc.contributor.authorBhat, U.en_US
dc.contributor.authorDuman, T. M.en_US
dc.date.accessioned2016-02-08T09:43:44Z
dc.date.available2016-02-08T09:43:44Z
dc.date.issued2012en_US
dc.identifier.issn1536-1276
dc.identifier.urihttp://hdl.handle.net/11693/21254
dc.description.abstractA two-way relay channel is considered where two users exchange information via a common relay in two transmission phases using physical-layer network coding (PNC). We consider an optimal decoding strategy at the relay to decode the network coded sequence during the first transmission phase, which is approximately implemented using a list decoding (LD) algorithm. The algorithm jointly decodes the codewords transmitted by the two users and sorts the L most likely pair of sequences in the order of decreasing a-posteriori probabilities, based on which, estimates of the most likely network coded sequences and the decoding results are obtained. Using several examples, it is observed that a lower complexity alternative, that jointly decodes the two transmitted codewords, has a performance similar to the LD based decoding and offers a near-optimal performance in terms of the error rates corresponding to the XOR of the two decoded sequences. To analyze the error rate at the relay, an analytical approximation of the word-error rate using the joint decoding (JD) scheme is evaluated over an AWGN channel using an approach that remains valid for the general case of two users adopting different codebooks and using different power levels. We further extend our study to frequency selective channels where two decoding approaches at the relay are investigated, namely; a trellis based joint channel detector/physical-layer network coded sequence decoder (JCD/PNCD) which is shown to offer a near-optimal performance, and a reduced complexity channel detection based on a linear receiver with minimum mean squared error (MMSE) criterion which is particularly useful where the number of channel taps is large.en_US
dc.language.isoEnglishen_US
dc.source.titleIEEE Transactions on Wireless Communicationsen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/TWC.2012.101112.120190en_US
dc.subjectFrequency-selective channelen_US
dc.subjectJoint decodingen_US
dc.subjectList decodingen_US
dc.subjectMMSE detectionen_US
dc.subjectPerformance analysisen_US
dc.subjectPhysical-layer network codingen_US
dc.subjectTwo-way relay channelsen_US
dc.subjectUnion boundsen_US
dc.subjectFrequency-selective channelsen_US
dc.subjectJoint decodingen_US
dc.subjectList decodingen_US
dc.subjectMMSE detectionen_US
dc.subjectPerformance analysisen_US
dc.subjectPhysical-layer network codingen_US
dc.subjectTwo-way relay channelsen_US
dc.subjectUnion boundsen_US
dc.subjectAlgorithmsen_US
dc.subjectCommunication channels (information theory)en_US
dc.subjectMergers and acquisitionsen_US
dc.subjectNetwork codingen_US
dc.subjectNetwork layersen_US
dc.subjectOptimizationen_US
dc.subjectDecodingen_US
dc.titleDecoding strategies at the relay with physical-layer network codingen_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.citation.spage4503en_US
dc.citation.epage4513en_US
dc.citation.volumeNumber11en_US
dc.citation.issueNumber12en_US
dc.identifier.doi10.1109/TWC.2012.101112.120190en_US
dc.publisherInstitute of Electrical and Electronics Engineersen_US


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