| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 99 === In this thesis, we utilize the multiple spatial channels of MIMO technology with a dynamically tuned backoff based on the estimation of the network status to propose collision-mitigation enhancements to the IEEE 802.11e enhanced distributed coordination function (EDCF). We utilize such multiple spatial channels for collision mitigation enhancements to the IEEE 802.11e EDCF. The key idea of the scheme, which is called MIMO based EDCF (MEDCF).
We first have model the built-in IEEE 802.11e physical and MAC layers to include all the details of the MEDCF scheme. Secondly, formulate an optimization spatial channel sharing program that sounding frame and backoff size, and then, we changing the sounding frame length on the system performance, and that finds the optimal value of the sounding frame that maximizes the system performance in terms of collision avoidance and transmission medium utilization. Finally, we present simulation results of the MEDCF scheme over a single-hop network.
In this thesis, the contributions of our research are as follows:
1. The scheme based on optimized online spatial channel sharing.
2. The scheme further reduces medium access collisions.
3. The scheme boosts medium utilization.
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