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arXiv 1802.05090eess.SP
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基于联合轨迹和功率控制的认知UAV通信

Cognitive UAV Communication via Joint Trajectory and Power Control

Yuwei Huang, Jie Xu, Ling Qiu, Rui Zhang

摘要:

研究了一种新的无人机与地面无线通信系统的频谱共享方案。我们认为,一个认知/二次无人机发射机与地面二次接收机(SR),在存在的主要地面通信链路,在相同的频段上工作。我们利用无人机的可控机动性,通过轨迹设计,以提高认知无人机的通信性能,同时控制在每个主接收机(PR)的同频干扰。特别是,我们最大限度地提高了从无人机到SR在有限的任务/通信周期的平均可实现的速率,通过联合优化无人机的轨迹和发射功率分配,受约束的无人机的最大速度,初始/最终位置,和平均发射功率,以及一组干扰温度(IT)的约束施加在每个PR保护他们的通信。然而,关节轨迹和功率优化问题是非凸的,因此很难得到最优解。为了解决这个问题,我们提出了一个有效的算法,确保通过应用交替优化和逐次凸逼近(SCA)技术获得局部最优解。数值结果表明,与基准方案相比,本文提出的无人机轨迹和功率联合控制方案显著提高了认知无人机通信系统的可达速率。

英文摘要:

This paper investigates a new spectrum sharing scenario between unmanned aerial vehicle (UAV) and terrestrial wireless communication systems. We consider that a cognitive/secondary UAV transmitter communicates with a ground secondary receiver (SR), in the presence of a number of primary terrestrial communication links that operate over the same frequency band. We exploit the UAV's controllable mobility via trajectory design, to improve the cognitive UAV communication performance while controlling the co-channel interference at each of the primary receivers (PRs). In particular, we maximize the average achievable rate from the UAV to the SR over a finite mission/communication period by jointly optimizing the UAV trajectory and transmit power allocation, subject to constraints on the UAV's maximum speed, initial/final locations, and average transmit power, as well as a set of interference temperature (IT) constraints imposed at each of the PRs for protecting their communications. However, the joint trajectory and power optimization problem is non-convex and thus difficult to be solved optimally. To tackle this problem, we propose an efficient algorithm that ensures to obtain a locally optimal solution by applying the techniques of alternating optimization and successive convex approximation (SCA). Numerical results show that our proposed joint UAV trajectory and power control scheme significantly enhances the achievable rate of the cognitive UAV communication system, as compared to benchmark schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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