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Preamble-data superposition random access in massive MIMO systems
journal contributionposted on 2020-06-01, 00:00 authored by Jie Ding, Jinho ChoiJinho Choi
In this letter, we propose a massive multiple input multiple output (MIMO) based preamble-data superposition random access (RA) (mPDSRA) scheme to improve the spectral efficiency scarcity of the conventional massive MIMO based grant-free RA (mGFRA). The key idea of the mPDSRA is to allow a group of RA users transmit preambles, while simultaneously, another group of RA users, whose channel information has already been obtained, transmit data. Thanks to asymptotic orthogonality of channel vectors in massive MIMO, simultaneous transmissions of preamble and data can be allowed and sequentially detected/decoded. Both theoretical analysis and simulation results reveal promising significant performance gains in terms of access success rate and achievable sum rate by the proposed mPDSRA over the conventional mGFRA schemes.
JournalIEEE wireless communications letters
Pagination906 - 910
Publication classificationC1 Refereed article in a scholarly journal
Science & TechnologyTechnologyComputer Science, Information SystemsEngineering, Electrical & ElectronicTelecommunicationsComputer ScienceEngineeringMIMO communicationData communicationSignal to noise ratioUplinkPayloadsFading channelsInterferenceRandom accesspreamble-data superpositiongrant-freemassive MIMOMTCCHANNELDistributed Computing