A secure transmission method was proposed based on cooperative jamming to reduce the secrecy loss caused by the correlation between main and wiretap channels and to improve the secrecy. Considering that the existing methods of cooperative jamming focused on the case of independent main and wiretap channels. the achievable secrecy performance was not satisfactory. In view of this. https://allfixelectricales.shop/product-category/alkaline-camera-battery/