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dc.contributor.authorLiang, Yu-Chungen_US
dc.contributor.authorRini, Stefanoen_US
dc.contributor.authorKliewer, Jorgen_US
dc.date.accessioned2019-04-02T06:04:49Z-
dc.date.available2019-04-02T06:04:49Z-
dc.date.issued2017-01-01en_US
dc.identifier.issn1058-6393en_US
dc.identifier.urihttp://hdl.handle.net/11536/150722-
dc.description.abstractThe joint design of both transmit constellation and low-density parity-check codes (LDPC) for the two-user, symbol-synchronous, binary-input Gaussian multiple access channel is considered. A transmission scheme is proposed to approach the symmetric capacity without the use of time-sharing or rate-splitting by joint decoding of the noisy sum of two LDPC codewords. This scheme relies on an extension of the classic belief propagation (BP) algorithm which allows for the simultaneous decoding of two LDPC codewords. We use a Gaussian approximation (GA) of the message distribution to investigate the convergence of the decoding process and derive a linear programming technique for joint code design. We also implement a superposition modulation scheme to achieve higher rate. This code design is applied to different input constellation choices which attain the symmetric capacity in different SNR regimes. It is shown that, quite surprisingly, in the moderate SNR regime the best performance is obtained by an asymmetric constellation.en_US
dc.language.isoen_USen_US
dc.titleJoint Constellation and Code Design for the Gaussian Multiple Access Channelen_US
dc.typeProceedings Paperen_US
dc.identifier.journal2017 FIFTY-FIRST ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS, AND COMPUTERSen_US
dc.citation.spage1728en_US
dc.citation.epage1732en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.identifier.wosnumberWOS:000442659900306en_US
dc.citation.woscount1en_US
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