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首页> 外文会议>IFIP TC6 International Conference on Personal Wireless Communications(PWC 2004); 20040921-23; Delft(NL) >Performance Evaluation of Bit Loading, Subcarrier Allocation, and Power Control Algorithms for Cellular OFDMA Systems
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Performance Evaluation of Bit Loading, Subcarrier Allocation, and Power Control Algorithms for Cellular OFDMA Systems

机译：蜂窝OFDMA系统的比特加载，子载波分配和功率控制算法的性能评估

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摘要

We consider the problem of radio resource allocation for QoS support in the downlink of a cellular OFDMA system. The major impairments present are co-channel interference (CCI) and frequency selective fading. The allocation problem involves assignment of base stations, subcarriers and bits, as well as power control, for multiple users. We evaluate the performance of a three-stage, low-complexity, heuristic algorithm, which allows to distribute radio resources among multiple users according to theirs individual QoS requirements, while at the same time maintaining the QoS of already established links in all co-channel cells. The evaluation includes checking system operation for various conditions described by different: a) delay spread, b) data rate required by a single user and c) path loss. It is shown that the proposed method is superior in terms of offered traffic and blocking probability to classical method based on FDMA with power control. Also, the performance of our scheme increases in highly frequency selective environment, disastrous for classical fixed schemes, since our method benefits from multiuser diversity.
机译：我们考虑在蜂窝OFDMA系统的下行链路中用于QoS支持的无线电资源分配问题。当前的主要损害是同信道干扰（CCI）和频率选择性衰落。分配问题涉及为多个用户分配基站，子载波和比特以及功率控制。我们评估了一种三阶段，低复杂度的启发式算法的性能，该算法允许根据多个用户的各自QoS要求在多个用户之间分配无线电资源，同时保持所有同信道中已建立的链路的QoS。细胞。评估包括检查系统运行情况，以了解不同情况所描述的各种情况：a）延迟扩展，b）单个用户所需的数据速率，以及c）路径损耗。结果表明，所提出的方法在提供业务量和阻塞概率方面优于基于带功率控制的FDMA的经典方法。而且，由于我们的方法受益于多用户分集，因此在高频率选择性环境中，我们的方案的性能会提高，这对于经典的固定方案来说是灾难性的。

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