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Sparse Code Multiple Access Over Universal Filtered Multicarrier

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2021年第10期70卷 10335-10346页

作者： Chen, Changju Zheng, Jianping Si, Fuping Xidian Univ Sch Telecommun Engn State Key Lab Integrated Serv Network Xian 710071 Shaanxi Peoples R China

In this paper, the uplink sparse code multiple access over universal filtered multicarrier (SCMA-UFMC) is studied. In SCMA-UFMC, each sub-band of UFMC is occupied by multiple users through SCMA. Note that the even-component of frequency domain (FD) received signal suffers from neither inter-sub-band interference nor inter-sub-carrier interference while the odd-component suffers from both. The message passing algorithm (MPA) is first employed to perform multiuser detection by utilizing only the even-component. Next, to improve the performance, the odd-component is further utilized. In this improvement, reliable estimates obtained by MPA over even-component are reconstructed and cancelled from odd-component, and then only a very small number of most-unreliable user data are refined by maximum likelihood method. Moreover, the union bound of the average symbol error probability (ASEP) of maximum likelihood detection using only even-component is derived, from which it is shown that ASEP is sub-band-independent. Finally, simulation results are given to demonstrate the performance of the proposed scheme and the effectiveness of the analytical ASEP result.

关键词： Multiuser detection Receiving antennas Interference Covariance matrices OFDM Maximum likelihood estimation Maximum likelihood detection Sparse code multiple access universal filtered multicarrier message propagation algorithm union bound multiuser detection

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Sparse Code Multiple Access over Universal Filtered Multicarrier in Rapidly Time Varying Channels 26

Sparse Code Multiple Access over Universal Filtered Multicar...

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26th IEEE Asia-Pacific Conference on Communications {APCC)

作者： Chen, Changju Zheng, Jianping Si, Fuping Xidian Univ Sch Telecommun Engn State Key Lab Integrated Serv Network Xian 710071 Shaanxi Peoples R China

ISBN: (纸本)9781728172545

In this paper, the uplink sparse code multiple access over universal filtered multicarrier (SCMA-UFMC) in rapidly time varying channels is studied. In SCMA-UFMC, each sub-band of UFMC is occupied by multiple users through SCMA. It is observed that the inter-band-interference can be neglected and both the inter-carrier interference and inter-user-interference are small from the equivalent frequency-domain (FD) channel of even component of received signal. Based on this observation, message passing algorithm is first employed to perform multiuser detection (MUD) by utilizing only even-component of received signal. Next, to improve the performance, a two-stage detection is further presented, where the unreliable estimates from the first-stage detection using even-component are refined by utilizing additional odd component of received signal. Finally, simulation results are given to demonstrate the performance of the proposed methods.

关键词： sparse code multiple access universal filtered multicarrier message propagation algorithm rapidly time varying channel multiuser detection

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Sparse Code Multiple Access with Index Modulation

Sparse Code Multiple Access with Index Modulation

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IEEE/CIC International Conference on Communications in China (ICCC)

作者： Zuo, Chen Zheng, Jianping Xidian Univ Collaborat Innovat Ctr Informat Sensing & Underst Sch Telecommun Engn Xian Peoples R China

ISBN: (纸本)9781728173276

In this paper, we study the application of index modulation (IM) to uplink sparse code multiple access (SCMA), and present a scheme called SCMA-IM. In the proposed SCMA-IM, the candidate resources of one user are partitioned into two groups. All the resources in the first group are utilized to transmit signals, and only part of resources in the second are activated through IM to transmit signals. The signals transmitted in these resources are jointly designed according to the same codebook design method as SCMA. Moreover, an effective message passing algorithm is presented to perform the multiuser detection. Simulation results show that the proposed SCMA-IM can achieve better performance than conventional SCMA when the number of receive antenna is large.

关键词： Sparse code multiple access index modulation message propagation algorithm multiple-antenna system

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