Update paper title

README.md

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 # OSD-JSCC weights
 
-Pretrained weights for **OSD-JSCC: SNR-Adaptive One-Step Diffusion for
-Perceptual Wireless Image Transmission**. Code, usage instructions and a Colab
+Pretrained weights for **OSD-JSCC: Neural Joint Source–Channel Coding with
+One-Step Diffusion**. Code, usage instructions and a Colab
 demo are at **https://github.com/tangshunpu/OSD-JSCC**.
 
 | File | Model | Size |