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OFDM-UWB系统基于用户速率的多用户动态资源分配算法.PDF

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第33 卷第9 期 通 信 学 报 Vol.33 No. 9 2012 年9 月 Journa l on Communications September 2012 OFDM-UWB 系统基于用户速率的多用户动态资源分配算法 程超,钱志鸿,李春兰,王雪 (吉林大学通信工程学院,吉林长春 130012) 摘 要:在原有动态资源分配算法基础上,提出了一种基于用户速率需求的动态资源分配算法 。该算法在满足用 户数据速率需求和服务质量要求(QoS )的前提下,以用户公平性为原则,分步执行子载波和比特分配来降低系 统总的发射功率。首先,通过比较不同子载波对用户速率的影响,引入速率影响因子,对子载波进行分配;然后 为每个用户子载波分配比特,并根据用户速率需求进行比特调整。为了进一步降低系统的复杂度,提出了一种通 过子载波分组来完成子载波比特分配的方法。仿真结果表明,该算法能够降低系统功耗、误码率和系统复杂度。 关键词:超宽带;动态资源分配;用户公平性 中图分类号:TN929.5 文献标识码:B 文章编号:1000-436X(2012)09-0160-08 Dynamic resource allocation scheme for multiuser OFDM–UWB systems based on user’s rate CHENG Chao, QIAN Zhi-hong, LI Chun-lan, WANG Xue (College of Communication Engineering, Jilin University, Changchun 130012, China) Abstract: According to original dynamic resource allocation algorithms, a new dynamic resource allocation algorithm for multiuser OFDM-UWB system based on users’rates was proposed to minimize the total transmitting power whil sa- tisfy requests for QoS and data rate of all users. Qual ty of the system was improved running the subcarrier allocation and bit allocation algorithms based on fairness of users. In subcarrier allocation process, rate impact factor was used to com- pare influence of different subcarriers to a user. In allocation process, bits were allocated to each user’s subcarriers first, then bits on each subcarriers were adjusted according to rate request of each user. In or to reduce the complexity
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