Backscatter communication has received widespread attention in the field of the Internet of things due to its advantages of low cost and low energy consumption. However, with the gradual expansion of data services, new challenges have been posed to the transmission performance of backscatter communication. Multiple-input multiple-output (MIMO) technology has been introduced into backscatter communication due to its advantages in system reliability and transmission rate. One of them, a dual ended joint coding technology called block-level unitary query space-time block code (BUTQ-STBC) , can fully exploit the diversity potential of backscatter channels, but at the cost of sacrificing transmission rate. To combat this issue, a new signal transmission scheme that selects the optimal communication link for data transmission based on the idea of spatial matching is proposed. The simulation results show that the proposed transmission scheme is superior to the BUTQ-STBC scheme. The proposed scheme provides a solution for efficient and reliable transmission of MIMO backscatter communication.
| 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 |