Multiple access schemes for two-way relaying using multiple antennas in multi-user scenarios

未来无线通信系统的一个主要挑战是对高传输速率的普遍需求。如果直接通信不能满足这种高需求，则可以使用继电器来支持节点之间的通信。在双向通信的情况下，取决于服务应用，可以为每个传输方向请求不同的速率。这可以通过不对称速率约束来表示。该更新提案的重点将是针对不同的多用户多天线非再生中继场景，在非对称速率约束下使用双向和多路方案，开发多址方案、空间滤波器以及网络编码和协作方法。通过有效地管理多个节点之间的干扰，可实现的和速率将被最大化。首先，目标是在每个节点只发送一个数据流和每个天线发送一个数据流的最大值这两个极端之间优化每个节点同时发送的数据流的数量。其次，将研究多组多路场景的扩展。第三，将考虑利用直接通信和中继通信的组合的混合单向/双向中继方案。最后，一个场景将被调查，其中一个节点与自己的个人消息是作为一个中继。

One major challenge for future wireless communication systems is the ubiquitous demand for high transmission rates. Relays can be used to support the communication between nodes if a direct communication does not satisfy this high demand. In case of bidirectional communication, different rates may be requested for each direction of transmission dependent on the service application. This can be expressed by asymmetric rate constraints. The focus of this renewal proposal will be on the development of multiple access schemes, spatial filters as well as network coding and cooperation approaches for different multi-user multi-antenna non-regenerative relaying scenarios using two-way and multi-way schemes under asymmetric rate constraints. The achievable sum rate shall be maximized by efficiently managing the interferences between the multiple nodes. Firstly, the goal is to optimize the number of simultaneously transmitted data streams of each node between the two extremes of transmitting only one data stream per node and the maximum of transmitting one stream per antenna. Secondly, an extension to a multi-group multi-way scenario will be investigated. Thirdly, a hybrid one-way / two-way relaying scheme will be considered exploiting the combination of direct and relay communication. Finally, a scenario will be investigated in which a node with an own individual message is acting as a relay.