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| 1 | Fairness optimization and power allocation in cognitive NOMA/OMA V2V network with imperfect SIC显示文摘In order to improve the reliability and resource utilization efficiency of vehicle-to-vehicle(V2V)communication system,in this paper,the fairness optimization and power allocation for the cognitive V2V network that takes into account the realistic three-dimensional(3D)channel are investigated.Large-scale and small-scale fading are considered in the proposed channel model.An adaptive non-orthogonal multiple access(NOMA)/orthogonal multiple access(OMA)scheme is proposed to reduce the complexity of successive-interference-cancellation(SIC)in decoding and improve spectrum utilization.Also,a fairness index that takes into account each user's requirements is proposed to indicate the optimal point clearly.In the imperfect SIC,the optimization problem of maximizing user fairness is formulated.Then,a subgradient descent method is proposed to solve the optimization problem with customizable precision.And the computational complexity of the proposed method is analyzed.The achievable rate,outage probability and user fairness are analyzed.The results show that the proposed adaptive NOMA/OMA(A-NOMA/OMA)outperforms both NOMA and OMA.The simulation results are compared with validated analysis to confirm the theoretical analysis. | Liang Xiaolin Liu Qianlong Cao Wangbin Liu Shuaiqi Zhao Shuhuan Zhao Xiongwen | 2023 | The Journal of China Universities of Posts and Telecommunications2023，30，6： | 0 |
| 2 | 考虑自动驾驶专用相位的交叉口信号控制方法显示文摘随着自动驾驶技术的发展,自动驾驶和人工驾驶混行交通流将在城市道路长期存在。如何针对混行交通流进行交通控制,进一步提升交叉口的通行效率已成为研究热点。已有针对混行交通流交通控制的研究大多使用统一控制模式,即自动驾驶和人工驾驶交通流共享路权和绿灯时间,较难体现自动驾驶交通流的通行效率优势。基于此,提出自动驾驶专用相位,布设自动驾驶专用车道,自动驾驶专用相位绿灯启亮时,自动驾驶车辆在交叉口内部“穿插式”通行,提高交叉口通行效率。首先,设计考虑自动驾驶专用相位的“双环-四组”相位结构,基于排队论建立自动驾驶专用相位通行能力预测模型;其次,以交叉口通行能力最大为目标,以是否设置自动驾驶专用相位和信号相位绿灯持续时间为决策变量,综合考虑车道布设、车道通行能力、信号配时以及流量分配等约束,建立混合整数非线性规划(Mixed-integer Nonlinear Program,MINLP)模型,利用AMPL(A Mathematical Programming Language)进行编译并使用Baron数学规划优化器高效求解。案例分析结果表明:自动驾驶专用相位能有效从通行时间上分离自动驾驶和人工驾驶车辆,提高混行交通流通行能力。对自动驾驶车辆市场占有率等关键参数进行敏感度分析,结果表明:随着自动驾驶车辆市场占有率增大,自动驾驶专用相位运行效益先增再减,进一步论证了自动驾驶专用相位的有效性和最佳适用条件。 | 吴伟 秦少敏 马万经 龙科军 | 2023 | 中国公路学报2023，36，10： | 0 |
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