Non-Orthogonal Multiple Access with Wireless Caching

非正交多址（NOMA）是下一代移动网络中较现有正交多址方案提高系统总数据速率的一种很有前途的技术。另一方面，最近的研究发现，用户正在通过移动网络消费越来越丰富的数字内容，如视频直播、电视剧和电影。如果多个用户使用相同的内容，并且可以预测使用情况，则可以将这些文件预提取到本地缓存中，这样用户就可以在本地访问文件，而不是从服务器检索文件。这样，在传送丰富内容的同时，传输的数据量也会减少，从而减少网络的流量负荷和能耗。在本项目中，将探索NOMA作为支持无线缓存的网络的交付机制，以提高系统性能。学生将开发新的传输技术和优化算法，以最大化某些系统性能指标，如总数据速率，用户公平性，能源效率等。研究工作主要是利用计算机模拟进行理论研究。它与以下ESPRC研究领域保持一致：“射频和微波通信”，“ICT网络和分布式系统”和“数字信号处理”。

Non-orthogonal multiple access (NOMA) is a promising technique for next generation mobile network to enhance the total system data rate over existing orthogonal multiple access schemes. On the other hand, recent studies have found that users are consuming more and more rich digital contents, such as live streaming video, TV episodes and movies, via the mobile network. If multiple users consume the same content and the usage can be predicted, these files can be pre-fetched into a local cache such that users can access the files locally, instead of retrieving the files from the server. In this way lower amount of data will be transported on the delivery of rich content, reducing the network traffic load as well as energy consumption. In this project, NOMA will be explored as a delivery mechanism for wireless cache-enabled network to enhance the system performance. The student will develop new transmission techniques and optimization algorithms in maximizing certain system performance measures, such as total data rate, user fairness, energy efficiency etc. The research work is primarily theoretical varied using computer simulation. It aligns with the following ESPRC research areas: "RF and microwave communications", "ICT networks and distributed systems", and "Digital Signal Processing".