| dc.description.abstract | With the rapid development of science and technology, electronic products are also moving forward from wired connection to wireless connection. From the previous military satellite, commercial equipment to today′s civil electronic products, the connection tends to be wireless. Therefore, spectrum resources are increasingly crowded due to the vigorous development of wireless networks. Various specifications are developed according to their different usage cases. As the unlicensed spectrum becomes crowded, devices accessing unlicensed spectrum will often be interfered by heterogeneous network devices. To tackle such issue, this thesis aims to use the bladeRF, which is a software defined radio platform, to realize the channel reservation mechanism over unlicensed spectrum.
In this design, channel reservation will be performed without affecting the ongoing transmission from any device. According to the predefined RSSI threshold, the bladeRF will detect whether the channel is idle or not. For a channel, it is separated as control subchannel and data subchannel. if the detected RSSI value is lower than the threshold, bladeRF will transmit jamming signal over control subchannel to reserve the whole channel and consequently prohibit heterogeneous network devices from accessing that channel. Moreover, data can be transported over data subchannel via the other transceiver. Otherwise, the bladeRF will switch to another channel for sensing in order to ensure that the proposed channel reservation mechanism will not affect the ongoing transmissions.
This thesis uses GNU Radio to develop the channel reservation mechanism, and verifies the development in a real environment. The effectiveness of the designed channel reservation mechanism is validated by means of observing the throughput variation of Wi-Fi network. | en_US |