Core Viewpoint - The article introduces DiffCP, a novel collaborative perception framework that utilizes conditional diffusion models to significantly reduce communication costs while maintaining high performance in collaborative sensing tasks [3][4][20]. Group 1: Introduction to Collaborative Perception - Collaborative perception (CP) is emerging as a promising solution to address the inherent limitations of independent intelligent systems, particularly in challenging wireless communication environments [3]. - Current C-V2X systems face significant bandwidth limitations, making it difficult to support feature-level and raw data-level collaborative algorithms [3]. Group 2: DiffCP Framework - DiffCP is the first collaborative perception architecture that employs conditional diffusion models to capture geometric correlations and semantic differences for efficient data transmission [4]. - The framework integrates prior knowledge, geometric relationships, and received semantic features to reconstruct collaborative perception information, introducing a new paradigm based on generative models [4][5]. Group 3: Performance and Efficiency - Experimental results indicate that DiffCP achieves robust perception performance in ultra-low bandwidth scenarios, reducing communication costs by 14.5 times while maintaining state-of-the-art algorithm performance [4][20]. - DiffCP can be integrated into existing BEV-based collaborative algorithms for various downstream tasks, significantly lowering bandwidth requirements [4]. Group 4: Technical Implementation - The framework utilizes a pre-trained BEV-based perception algorithm to extract BEV features, embedding diffusion time steps, relative spatial positions, and semantic vectors as conditions [5]. - An iterative denoising process is employed, where the model integrates observations from the host vehicle with collaborative features to progressively recover original collaborative perception features [8]. Group 5: Application in 3D Object Detection - DiffCP was evaluated in a case study on 3D object detection, demonstrating its ability to achieve similar accuracy levels as state-of-the-art algorithms while reducing data rates by 14.5 times [20]. - The framework allows for adaptive data rates through variable semantic vector lengths, enhancing performance in challenging scenarios [20]. Group 6: Conclusion - DiffCP represents a significant advancement in collaborative perception, enabling efficient information compression and reconstruction for collaborative sensing tasks, thus facilitating the deployment of connected intelligent transportation systems in existing wireless communication frameworks [22].