基于退避阻塞的多带UWB吞吐量性能分析

Saturation throughput analysis of multiband UWB systems based on backoff defer

针对多带UWB优先级竞争接入（PCA）方式，进行了系统饱和吞吐量性能研究。在计入了标记时隙和软预留时隙的前提下，采用退避阻塞阶段作为第三维，建立了相应的离散三维马尔可夫链模型。通过用简捷的分析推导算法获得数据包发送概率和条件碰撞概率，较精确地得到了区分优先级的多带UWB系统饱和吞吐量。使用NS2软件对此分析模型进行仿真研究，仿真结果与理论计算结果在误差范围内一致，表明了此分析模型的鲁棒性，同时为进一步提高PCA接入方式下的系统饱和吞吐量性能提供了理论依据。

The saturation throughput performance of muhiband UWB systems under the prioritized contention access （PCA） was studied. Taking account of beacon period （BP） slots and soft distributed reserved protocol （DRP） slots~ backoff defer with tri-dimension Markovia state transfer was taken to construct the corresponding discrete three-dimensional Markovia model. The saturation throughput under PCA of multiband UWB systems was accurately gained for priority distinguishing by achieving the packet transmission probability and the conditional collision prob- ability with the concise analyzing and reasoning. The simulation research on the model was performed with the NS2 software and the result matched with that from the theoretical computation in the range of error. This proofs the ro- bustness of the analysis model, and establishes the theoretical basis for further enhancing the system saturation throughput performance under PCA.