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

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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.