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arXiv 2202.01592eess.SP
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后向散射增强NOMA协作V2X通信在非理想CSI下的能量效率优化

Energy Efficiency Optimization for Backscatter Enhanced NOMA Cooperative V2X Communications under Imperfect CSI

Wali Ullah Khan, Muhammad Ali Jamshed, Eva Lagunas, Symeon Chatzinotas, Xingwang Li, Bjorn Ottersten

摘要:

汽车工业5.0将使用超越第五代(B5G)技术,在各种车载传感器、车辆和其他设备之间提供强大、计算智能和节能的数据共享。最近,环境后向散射通信(AmBC)由于提供无电池通信而在研究界获得了极大的兴趣。AmBC可以调制有用的数据,并使用现有RF信号的能量和频率将其反射到附近的设备。然而,由于没有导频序列和有限的功率,获得AmBC系统的信道状态信息(CSI)将是非常具有挑战性的。作为多址接入技术的最新成员之一,非正交多址接入(NOMA)已经成为B5G无线网络中在相同频谱资源上连接大规模设备的有前景的解决方案。在不完美CSI条件下,提出了一种新的AmBC增强NOMA协作V2X网络能量有效传输优化框架.我们通过优化BS处的功率分配和反向散射传感器处的反射系数,同时最小化V2X网络的总发射功率,同时保证个人服务质量。总功率最小化问题是一个多变量耦合的非凸优化问题,具有复杂性和挑战性。因此,我们首先将原问题解耦为两个子问题,并将非线性速率约束转化为线性约束。然后,我们采用迭代次梯度法得到一个有效的解决方案。为了比较,我们还提出了一个传统的NOMA合作V2X网络,没有AmBC。仿真结果显示了我们提出的AmBC增强型NOMA协作V2X网络在可实现的总能效方面的优势。

英文摘要:

Automotive-Industry 5.0 will use beyond fifth-generation (B5G) technologies to provide robust, computationally intelligent, and energy-efficient data sharing among various onboard sensors, vehicles, and other devices. Recently, ambient backscatter communications (AmBC) have gained significant interest in the research community for providing battery-free communications. AmBC can modulate useful data and reflect it towards near devices using the energy and frequency of existing RF signals. However, obtaining channel state information (CSI) for AmBC systems would be very challenging due to no pilot sequences and limited power. As one of the latest members of multiple access technology, non-orthogonal multiple access (NOMA) has emerged as a promising solution for connecting large-scale devices over the same spectral resources in B5G wireless networks. Under imperfect CSI, this paper provides a new optimization framework for energy-efficient transmission in AmBC enhanced NOMA cooperative vehicle-to-everything (V2X) networks. We simultaneously minimize the total transmit power of the V2X network by optimizing the power allocation at BS and reflection coefficient at backscatter sensors while guaranteeing the individual quality of services. The problem of total power minimization is formulated as non-convex optimization and coupled on multiple variables, making it complex and challenging. Therefore, we first decouple the original problem into two sub-problems and convert the nonlinear rate constraints into linear constraints. Then, we adopt the iterative sub-gradient method to obtain an efficient solution. For comparison, we also present a conventional NOMA cooperative V2X network without AmBC. Simulation results show the benefits of our proposed AmBC enhanced NOMA cooperative V2X network in terms of total achievable energy efficiency.

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