Uplink NOMA Random Access Systems With Space-Time Line Code

This work proposes a random access system with uplink non-orthogonal multiple access (NOMA), where users transmit their packets by using the space-time line code (STLC) to fully exploit the spatial diversity without channel state information at the receiver. More specifically, users with a single an...

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Bibliographic Details
Published inIEEE transactions on vehicular technology Vol. 69; no. 4; pp. 4522 - 4526
Main Authors Seo, Jun-Bae, Jin, Hu, Joung, Jingon, Jung, Bang Chul
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antennas
Decoding
NOMA
Nonorthogonal multiple access
Packet transmission
Power control
Random access
Receiving antennas
Signal to noise ratio
space–time line code (STLC)
Spatial diversity
successive interference cancellation
Throughput
Uplink
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Summary:This work proposes a random access system with uplink non-orthogonal multiple access (NOMA), where users transmit their packets by using the space-time line code (STLC) to fully exploit the spatial diversity without channel state information at the receiver. More specifically, users with a single antenna estimate channel gain from the base station (BS) with two antennas, encode the information using the STLC, and then transmit it using transmit power control so that the received power of their packets at the BS can be one of the predetermined values. The BS decodes the received packets via STLC decoding and the successive interference cancellation technique. Owing to spatial diversity, we show that the proposed scheme improves energy efficiency in comparison to the conventional system with a single antenna BS.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2020.2974460