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Regarding the increasing number of IoT devices and the trend towards miniaturization, which require high concurrent transmission performance and low energy consumption, an improved MAC(media access control) layer CSMA/CA(carrier sense multiple access with collision avoidance) protocol design is proposed based on physical layer MIMO(multiple input multiple output) technology. It simplifies the complexity of executing the CSMA/CA protocol on terminals and employs MIMO to achieve concurrent access for multiple terminals through cross-layer design, and allows terminal devices to easily and conveniently access the network system. An analysis of the throughput performance of the proposed protocol was presented, and its effectiveness and the accuracy of the theoretical analysis were verified through simulation, which not only provides a theoretical supplement to the redesign of the CSMA/CA protocol but also offers practical guidance for engineering applications.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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