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当扩散模型遇上6G:AI如何“修复”无线信号

当扩散模型遇上6G:AI如何“修复”无线信号
2026年全民数字素养与技能提升月的主题是“数智赋能 全民共享”。随着6G技术飞速发展,数字生活已触手可及。6G拥有哪些“超能力”?又将如何重塑世界?科普中国联合中国移动科学技术协会推出6G系列深度解读,带您解锁未来新可能。

01
什么是扩散模型

在无线通信中,信号在传播过程中经常会受到遮挡、反射和噪声干扰。传统的信道估计方法,在复杂环境下性能往往会明显下降。简单来说,就是无线环境一复杂,系统就容易“看不清”真实信号。

近年来,研究人员开始利用人工智能(AI)进行信道估计,希望通过深度学习提升信号恢复能力。不过,这类方法通常需要大量训练数据,一旦实际环境发生变化,或者数据不足,模型效果就容易不稳定。未来6G网络会更加智能、更加动态,这个问题也会更加突出。因此,业界开始探索一种更“聪明”的方法:不仅能在复杂噪声环境下稳定恢复信号,还能够在数据较少时依然保持较好的性能。

扩散模型正是在这样的背景下受到广泛关注。它近年来在AI绘画、AI视频生成等领域迅速走红,而现在,研究人员也开始尝试把它应用到无线通信中。其核心思想其实并不复杂,可以简单理解为:“先学会怎么把东西变模糊,再学会怎么把它一点点恢复清晰。”这个过程可以类比为“修复老照片”。扩散模型就像是在训练AI学习如何修复一张被严重干扰的图片,此过程包括两个关键点:

正向加噪:类似于不断给一张清晰照片覆盖“雪花噪点”,最终让图像变得完全模糊。这个过程主要用于生成训练样本。

反向去噪:这是模型真正学习能力的核心。AI通过大量训练,逐步学会如何把噪声一点点去掉,最终恢复出清晰图像。

换句话说,扩散模型最擅长的事情,就是“从一团杂乱信息里,还原出真正有用的内容”。相比传统生成模型,扩散模型训练更加稳定,生成结果也更细致。

02
如何用扩散模型恢复信号

(一)双重功能设计:去噪与增强

将扩散模型引入无线通信后,它不仅能“修复信号”,还能“生成数据”。一方面,扩散模型可以通过逐步去噪,从复杂干扰中恢复真实信道状态信息(CSI),实现信号重构与恢复。另一方面,当真实训练数据不足时,它还能生成大量高质量的模拟信道数据,用于AI模型训练,提升系统在复杂环境下的适应能力。简单来说,它既像一个“信号修复器”,又像一个“数据生成器”。

(二)网络架构与算法流程

扩散信道恢复框架主要包括训练和推理两个阶段:

1)训练阶段:模型输入真实信道样本,并通过逐步加噪生成训练数据,随后利用神经网络学习对应的反向去噪过程。模型会不断学习“噪声是如何产生的”,从而逐渐掌握复杂无线环境中的信号变化规律。

2)推理阶段:在CSI估计任务中,接收端获得的受干扰信号经过预处理后作为输入,模型通过多轮逐步去噪,最终恢复真实信道;在数据增强任务中,模型则可以从随机噪声出发,生成多样化的合成信道样本。

图1 基于扩散模型的智能信道恢复框架

03
产业意义与未来展望

(一)通信AI融合的重要方向

扩散模型的引入,意味着无线通信正在从传统“信号处理”逐渐走向“AI驱动”。过去的通信系统,更像是在按照固定规则处理信号;而未来,AI不仅能够识别信号,还能理解、生成甚至“重建”信号。这对于未来6G智能空口、智能网络以及AI内生通信架构的发展,都具有重要意义。

(二)多场景扩展潜力

除了信道恢复之外,扩散模型未来还可以应用在很多方向:1)波束预测,帮助系统更准确地找到最佳信号传输方向;2)通信感知一体化,让网络不仅能传输数据,还能感知周围环境;3)边缘智能,帮助低算力设备优化通信性能;4)AI训练数据生成,缓解真实无线数据采集成本高的问题,为AI通信提供更多“训练素材”。

(三)未来研究方向

未来研究可进一步聚焦于:轻量化扩散架构设计,以适应实时6G空口;跨模态扩散模型,结合感知与通信信号的联合建模;标准化推进,探索扩散信道恢复在标准化 框架下的接口定义;试验网验证,与产业伙伴合作,在真实环境中验证系统级性能。

04
结语

作为生成式人工智能的重要代表技术,扩散模型正在推动无线通信系统从“信号驱动”向“智能驱动”演进。在信道恢复场景中,扩散模型依托“去噪重构”与“数据增强”两种能力,不仅提升了信道估计精度,也增强了复杂环境下系统的稳定性与鲁棒性,为未来6G智能通信网络的发展提供了新的技术路径。 

来源:科普中国
编辑:徐杨
责任编辑:陈奕源
审稿:陈晓慧、劳婉菲
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  1. CONNECT:[ UseTime:0.000509s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000839s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000284s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000523s ]
  8. SELECT * FROM `article` WHERE `id` = 765633 LIMIT 1 [ RunTime:0.000455s ]
  9. UPDATE `article` SET `lasttime` = 1781726135 WHERE `id` = 765633 [ RunTime:0.021171s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000308s ]
  11. SELECT * FROM `article` WHERE `id` < 765633 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000535s ]
  12. SELECT * FROM `article` WHERE `id` > 765633 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 765633 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000801s ]
  14. SELECT * FROM `article` WHERE `id` < 765633 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000818s ]
  15. SELECT * FROM `article` WHERE `id` < 765633 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001352s ]
0.105102s