Resource allocation for multiuser STBC-BF MIMO-OFDM downlink with imperfect channel information

To improve the performance of a multiuser MIMO-OFDM system with imperfect channel status information, a downlink adaptive resource allocation algorithm which combines space-time block coding and beam forming (STBC-BF) is proposed. The algorithm allocates the subcarriers with a shared manner. A zero forcing processing with joint Rx-Tx is used to suppress the co-channel interference (CCI) and to construct uncorrelatedchannels for STBC. An adaptive power allocation for the STBC equivalent channels can increase signal to interference and noise ratio at the receiver. Simulation results show that under the condition of an imperfect CSI, the proposed algorithm improves the system performance and reduces the number of BS transmit antennas required.     

Power allocation for MIMO-OFDM systems with multi-user decoupling and scheduling

1 .INTRODUCTIONRecentinformation-theoretic results haveshownthat multi-ple-input multiple-output ( MI MO) channels have a greatpotential to i mprove spectral efficiency in rich scatteringwireless channels[1 ,2].Si multaneously,orthogonal frequen-cy division multiplexing (OFDM) has gained anincreasinginterest as a promisingalternativeforfuture highrate wide-band wireless systems because of its lowcomplexity signalprocessingto counteract frequency selectivity. The combi-nationof MI MOsy…     

一种低复杂度的MIMO-OFDMA下行链路资源分配方案

针对MIMO-OFDMA下行链路系统,考虑在总功率和BER 以及用户数据速率成比例的约束下,以获取整个系统吞吐量极大化为准则,提出一种基于成比例公平性约束的资源分配方案。该方案在子载波分配时,松弛成比例约束条件,使用户数据速率近似地成比例于每个用户分配的子载波数,在功率分配时,推导出一种线性的不需要迭代的低复杂度功率分配方案。仿真和分析表明,整个方案在保证系统吞吐量的前提下,取得了用户间良好的速率公平性,同时又具有较低的计算复杂度。     

产品优化设计的资源分配模型

研究产品优化设计中设定设计属性值的资源分配方法．考虑产品设计过程中多种资源的优化分配，在设计预算和资源约束下，设定产品设计属性值，使用户对产品的总体满意水平达到最大．这种方法使产品优化设计的品质功能展开方法从策略计划层扩展到运作计划层，把品质优化设计和资源分配结合起来，使得品质设计计划在部件展开(part deployment)层和运作层的工艺计划(operational process planning)更可行，更易实现．     

Resource allocation with minimum transmit power in multicast OFDM systems

To minimize the total transmit power for multicast service in an orthogonal frequency division multiplexing (OFDM) downlink system, resource allocation algorithms that adaptively allocate subcarriers and bits are proposed. The proposed algorithms select users with good channel conditions for each subcarrier to reduce the transmit power, while guaranteeing each user’s instantaneous minimum rate requirement. The resource allocation problem is first formulated as an integer programming (IP) problem, and then, a full search algorithm that achieves an optimal solution is presented. To reduce the computation load, a suboptimal algorithm is proposed. This suboptimal algorithm decouples the joint resource allocation problem by separating subcarrier and bit allocation. Greedy-like algorithms are employed in both procedures. Simulation results illustrate that the proposed algorithms can significantly reduce the transmit power compared with the conventional multicast approach and the performance of the suboptimal algorithm is close to the optimum.     

一种多天线多用户下行系统保障公平的资源分配策略

将比例公平调度机制推广到多天线多用户下行系统,提出了一种保障公平的资源分配方案和多用户调度机制.基站利用块对角化预编码机制,将多天线下行系统分解为并行无干扰子信道,并根据各个用户的信道状态,选择优化用户集进行传输,从而在保障公平性的同时最大化系统总速率.同时分析了信道反馈错误对该资源分配机制的影响.仿真结果表明,与其他几种用户调度机制相比,该资源分配方案在吞吐量和公平性之间取得了良好的折中.     

单播与多速率组播共存网络中的公平资源分配

以最大化网络用户效用值为目标,考虑组播接收者的异构性,将单播和组播任务纳入统一的凸规划模型研究,并应用惩罚函数法推导出一种启发式速率控制算法。该算法在IP网络中分布式实现时,路由器使用RED算法标记报文,反馈拥塞信息;用户端提取拥塞信息计算最优速率,并作相应更新。通过选择合适的算法参数及效用函数,单播与组播将依据比例公平性准则共享网络资源。仿真结果验证了该算法的有效性。另外,还分析了多速率组播分层实现时,不同的带宽离散化密度对资源分配公平性的影响。     

面向ISP的网络资源市场分配方法

随着因特网商业化进程的发展,在网络资源分配中引入价格因素已成为一种新的趋势。现有研究并没有充分考虑到互联网服务提供商的经济角色。鉴于此,针对互联网服务提供商的自治性与异构性,提出了一种面向互联网服务提供商的网络资源市场分配方法。该方法将互联网服务提供商与用户视为经济活动中的生产者与消费者,在完全竞争的市场条件下,通过价格机制来平衡供需,完成稀缺资源的有效配置。仿真实例表明,本方法是可行的、正确的和有效的。     

权力分散多人递阶资源配置中下层决策者合作联盟的形成及利益分配研究

本文详细地研究了下层决策者之间部分或全部允许合作的权力分散多人递阶资源配置问题, 对文献[2]中结果共享合作方式的结论作了推广, 首次提出合作联盟利益分配的核心分配向量集的解概念, 并讨论了一些基本性质。通过对核心分配向量集的分析可以指导下层决策者中哪些部门组成合作联盟能够获得更大的利益。文中利用实例作了分析说明。