This paper tackles a non-orthogonal multiplexing (NOM)-based realization of broadcast-unicast overlay transmission in cloud-radio access networks (C-RANs). In particular, fronthaul compression and precoding are jointly optimized to maximize the throughput in the considered network. The problem further optimizing the power allocation between broadcast and unicast signals is addressed as well. The algorithmic solutions are obtained by means of majorization minimization (MM)-type difference-of-convex (DC) programming. Moreover, the proposed solutions are further extended to cope with the uncertainty of channel state information (CSI) to enable robust transmission. Computer simulations are performed to verify that the proposed scheme attains substantial achievable rate gain over the conventional decentralized precoding in entire parameter regions considered.

中文翻译：

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C-RAN中基于NOMA的广播和单播业务联合传输的前传压缩和预编码优化

本文解决了基于非正交复用 (NOM) 的云无线电接入网络 (C-RAN) 中广播单播重叠传输的实现。特别地，前传压缩和预编码被联合优化以最大化所考虑网络中的吞吐量。进一步优化广播和单播信号之间的功率分配的问题也得到解决。算法解决方案是通过专业化最小化（MM）型凸差（DC）编程获得的。此外，所提出的解决方案进一步扩展以应对信道状态信息（CSI）的不确定性，以实现稳健传输。