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Aiming at the problems of tight spectrum resources，insufficient computing resources，and easy interception and tampering of information transmission in the Internet of Things（IoT）mobile edge computing（MEC）network，a resource allocation scheme for the IRS-assisted user backscatter communication（BC）technology secure offloading perception MEC network is proposed.By integrating cognitive radio（CR），IRS and BC technologies，an optimization problem targeting the maximization of secure MEC network throughput is constructed，and thejoint optimization solution is carried out by using methods based on block coordinate descent（BCD），Lagrangian duality，and quadratic transformation.Simulation results show that compared with the random IRS phase scheme and the random beamforming scheme，the proposed scheme can increase the task computation amount of secondary users by about 260%and 178%，verifying its effectiveness and feasibility under complex constraint conditions.
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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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