Spectral-efficiency comparison of different multiple-access schemes under a generalized framework

Yang, Dong, Liu, Xingcheng and Yang, Lie Liang (2018) Spectral-efficiency comparison of different multiple-access schemes under a generalized framework. In 2017 IEEE/CIC International Conference on Communications in China, ICCC 2017. vol. 2018-January, IEEE. pp. 1-6 . (doi:10.1109/ICCChina.2017.8330408).

Abstract

Based on multicarrier communications principles, this paper compares the spectral-efficiency (SE) of a range of multiple-access (MA) schemes via a generalized framework referred to as the generalized code-division multiple-access (GCDMA). As detailed in the paper, by assuming different classes of spreading codes, the GCDMA can be readily configured to form different MA schemes. The ones considered include the frequency-division multiple-access (FDMA), orthogonal multicarrier CDMA (OMC-CDMA), fractionally spread OMC-CDMA (FS/OMC-CDMA), the low-density spreading or sparse-code multiple-access (SCMA), and the multicarrier CDMA (MC-CDMA) employing random binary spreading. For the SE of these MA schemes, we consider two operational modes, namely Mode A of fixed code-allocation and Mode B with adaptive code-allocation. Furthermore, for SCMA, we compare three operational scenarios, namely Scenarios 1,2, and 3, as specified in Section III. We provide the formulas for evaluating the SE of these MA schemes operated in different cases, and compare their SE performance based on numerical simulations.

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Contributors

Author: Lie Liang Yang

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