首页> 外文OA文献 >Energy efficient green wireless communication systems with imperfect CSI and data outage
【2h】

Energy efficient green wireless communication systems with imperfect CSI and data outage

机译:CSI和数据中断不完善的节能绿色无线通信系统

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Modern applications involve green communication technologies motivating well optimisation in the power–limited regime. In comparison to most of existing related work that assumes perfect channel state information (CSI) is always available, which is unfortunately not true in reality, this work focuses on an optimal energy efficient solution for resource allocation in multiuser orthogonal frequency division multiple access (OFDMA) networks in the presence of imperfect CSI and data outage conditions. Particularly, in view that wireless channel conditions, circuit power consumptions and users’ quality–of–service (QoS) requirements are heterogeneous in nature, we enable attractive tuning options by letting energy efficiency optimisation objective to assign weights to each allocation link. Also, we interpret effects of data outage due to imperfect CSI using a profound insight on the monotonicity of noncentral chi-squared inverse distribution function, which reveals that our design complies with expected physics and mechanics of conventional energy efficiency approach and that it can be successfully degenerated to the energy efficiency model with perfect CSI. Furthermore, we formulate a mixed combinatorial problem towards maximising the energy efficiency subject to a minimum QoS requirement, channel interference and transmitting power constraints. The problem is transformed into an equivalent quasiconcave problem with respect to power, and concave problem with respect to the subcarrier indexing coefficients using the concept of subcarrier time–sharing. We optimise through a simple and versatile methodology, which uses standard–Lagrangian optimisation technique to obtain joint dynamic subcarrier and adaptive power allocations by means of final formulas. We also examine key properties of the introduced optimal solution in terms of implementation convergence and complexity, level of optimality, and impact of imperfect CSI coefficients and circuit power on network performance. The simulation results demonstrate the effectiveness of our allocation scheme for achieving higher energy efficiency performance with the guaranteed QoS support and lower complexity than existing approaches especially when perfect CSI is not available.
机译:现代应用涉及绿色通信技术,可以在功率受限的情况下优化井井。与大多数现有的相关工作相比,前提是假定始终可获得完美的信道状态信息(CSI),但事实并非如此,但事实并非如此,该工作的重点是在多用户正交频分多址(OFDMA)中分配资源的最佳节能方案),CSI和数据中断情况不理想的网络。特别是,鉴于无线信道条件,电路功耗和用户的服务质量(QoS)要求本质上是异构的,我们通过让能效优化目标为每个分配链路分配权重来启用有吸引力的调整选项。此外,我们使用对非中心卡平方逆分布函数的单调性的深刻见解来解释由于CSI不完善而造成的数据中断的影响,这表明我们的设计符合常规能效方法的预期物理和力学原理,并且可以成功实现退化为具有完美CSI的能效模型。此外,我们制定了一个混合组合问题,以在最小QoS​​要求,信道干扰和发射功率约束下使能效最大化。利用子载波分时的概念,该问题就功率而言等效为准凹面问题,对于子载波索引系数则为凹问题。我们通过一种简单而通用的方法进行优化,该方法使用标准拉格朗日优化技术,通过最终公式获得联合动态副载波和自适应功率分配。我们还从实现的收敛性和复杂性,最优性水平以及不完善的CSI系数和电路功率对网络性能的影响方面研究了引入的最优解决方案的关键属性。仿真结果表明,与现有方法相比,特别是在没有完美CSI的情况下,我们的分配方案可实现更高的能效性能,并具有保证的QoS支持和更低的复杂性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号