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Deep learning (DL) is an effective method for achieving automatic modulation identification (AMI) technology. However，DL methods generally struggle to balance recognition accuracy and efficiency simultaneously. To address this，a lightweight AMI method based on enhanced multi-scale feature fusion is proposed. First，a lightweight multi-scale feature fusion module is designed，which efficiently extracts multi-scale features of modulation signals through a cross-scale convolutional structure，enhancing the model's ability to represent different signal features. Next，an adaptive feature enhancement module is constructed，combining depthwise separable convolution and attention mechanisms to adaptively learn channel weights of key features，highlighting important signal features while reducing interference from irrelevant ones. Finally，a differential balance classifier is designed to focus on recognizing subtle modulation patterns，enabling efficient classification. Experimental results show that the proposed method improves recognition accuracy by an average of 5.91%，reduces the number of parameters by approximately 8.5×105，and decreases iteration time per sample by 0.0624 seconds. Compared with the advanced models，it achieves higher accuracy，faster speed，and fewer parameters.
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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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