| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 102 === In wireless communication, when two or more signals are received by a receiver simultaneously, if the strongest signal’s SINR exceeds a threshold, it can still be successfully received. This phenomenon is called Capture Effect. In this thesis, we propose a joint transmit power control and backoff mechanism in IEEE 802.11 WLAN to exploit Capture Effect and enhance overall system performance.
In the proposed scheme, we divide the network into three non-overlapped areas and assign different target received powers for each areas. Stations in each area should tune their transmission powers to meet the target received power at Access Point (AP). Thus, when AP receives two or more signals with different power levels, it may receive correctly the signal with highest power level due to Capture Effect. Moreover, the backoff mechanism of IEEE 802.11 is adjusted in the scheme in consideration of fairness issue. The main idea is that we assign the stations with lower received power level a better contention probability to access the channel to compensate their loss due to Capture Effect. The simulation results show that the proposed design can get much higher throughput than the legacy IEEE 802.11 design with slightly loss on fairness.
|
|---|
