Abstract
In a wireless communication system, a cooperative communication technique is a communication method for improving performance. In the conventional scheme, when a destination user is located in the cell boundary, one base station communicates with a destination user. At a same time, a destination user communicates with other base stations which cooperate with base station. If a distance between a base station and a destination user is far, the quality of communication is degraded by the effect of channel attenuation. Therefore, this paper proposes an enhanced cooperative transmission scheme using the orthogonal frequency multiplexing in the wireless communication system. The proposed scheme uses extra relays between a base station and a destination user. When the channel state of a destination user is bad, other base stations are used. In order to obtain better performance than the conventional scheme, the cooperative decode and forward (DF), and space time cyclic delay diversity (STCDD) and cyclic delay diversity (CDD) are applied in the extra relays. In simulation results, the proposed scheme has higher error and throughput performances than the conventional scheme for obtaining diversity gain when the used modulation scheme is increased. Also, the proposed scheme which uses cooperative DF has slightly better error and throughput performances than the proposed scheme which uses cooperative STCDD and CDD due to less error propagations and resultant higher diversity gain.
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Acknowledgements
This research was supported by the MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) support program (IITP-2018-0-01423) supervised by the IITP (Institute for Information & Communications Technology Promotion) and was supported by Institute for Information & Communications Technology Promotion (IITP) Grant funded by the Korea Government (MSIT) (no. 2017-0-00217, Development of Immersive Signage Based on Variable Transparency and Multiple Layers).
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Kang, CH., Yang, HJ. & Song, HK. Cooperative communication system with multiple relays for performance improvement in wireless communication system. J Ambient Intell Human Comput 10, 3461–3467 (2019). https://doi.org/10.1007/s12652-018-1062-2
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DOI: https://doi.org/10.1007/s12652-018-1062-2