| Summary: | 碩士 === 國立臺北科技大學 === 電子工程系碩士班（碩士在職專班） === 105 === With the increasing popularity of mobile devices, and wireless transmission of high-definition video requirements are getting higher and higher. IEEE 802.11ac standard announced four channel bandwidth, can effectively improve throughput, the three common bandwidths are 80/40/20MHz. However, there is a high probability of overlapping channels due to co-channel interference in a 80MHz bandwidth transmission.
In this thesis, all the experiments are using Wi-Fi chip vender Qualcomm Atheros and Broadcom to investigate the interference and channel allocation of Wi-Fi device at 5GHz band. First of all, measuring the point-to-point transmission throughput in a radio-frequency anechoic chamber to obtain the transmission data under a good channel quality for reference. And then measuring transmission throughput in different interference scenarios in order to simulate an environment with multiple-user using a same channel. Secondly, planning a channel selection mechanism to reduce interference, thereby enhancing the transmission throughput. Finally, measuring the throughput with channel selection mechanism in the actual open space, and the size of the throughput is taken for the evaluation of performance.
The experimental results show that channel overlapping in 80MHz bandwidth, the performance will decreased around 98%. Overlapping in 40MHz bandwidth, the performance will decreased around 73%. Using channel selection mechanism could avoid overlapping interference and improve performance up to 230% in a clear 80MHz bandwidth channel, up to 63% in a clear 40MHz bandwidth channel.
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