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http://dx.doi.org/10.7840/kics.2016.41.11.1349

Design and Performance Evaluation of Complex Spreading CDMA Systems for Improving Multiple Access Efficiency  

An, Changyoung (Department of electronic engineering, Chungbuk National University)
Ryu, Heung-Gyoon (Department of electronic engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.41, no.11, 2016 , pp. 1349-1355 More about this Journal
Abstract
It should guarantee high reliability and ultra low latency communication. Additionally, it should support connection between massive devices. As one of estimated scenarios for 5G mobile communication, mobile devices and sensors using low data rate wireless communication will increase. For communication of these devices, single-carrier system can be considered. In order to satisfy these requirements, in this paper, we propose CDMA (Code Division Multiple Access) system using complex spreading and Multi-level BPSK(Binary Phase Shift Keying). The proposed system spread transmit symbol by using chip code consisted of real and imaginary number. As simulation results, we can confirm that although the proposed system has 3dB lower BER (Bit Error Rate) performance than conventional CDMA system, the proposed system can support 2 times more users in comparison with conventional CDMA system.
Keywords
CDMA; complex spreading; multiple access; massive devices; Multi-level BPSK;
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