Research Topic

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

Multi-user two-way relaying.

One major challenge for future wireless communication systems is the ubiquitous demand of high transmission rates. Relaying is a promising technique to meet this demand. In relaying, the transmission between two nodes BS and S1 or S2 may be assisted by an intermediate relay RS if a direct transmission is not possible, e.g., due to shadowing or limited transmit powers. Non-regenerative two-way relaying is a relaying scheme which utilizes the radio resources particularly efficiently. In the first time slot, all nodes transmit simultaneously to the relay. In the second time slot, RS retransmits a linear processed version of the received superimposed data transmissions of the nodes. Afterwards, the nodes can determine the desired data by subtracting their own transmitted but interfering data from the received superposition. Multi-antenna techniques are known to provide significant performance gains in terms of achievable data rates. Most of the research on two-way relaying is limited to a single pair of nodes. However, typically multiple users compete for the radio resources in wireless communications. Thus, system concepts for multi-user multi-antenna two-way relaying and the multiple access schemes required to manage the interferences between multiple users, e.g., S1 and S2 shall be developed in this project.

Key Research Area

Hierarchical Multi-Scale Modeling and Simulation: Modeling Communication Systems


Holger Degenhardt


Dolivostraße 15

D-64293 Darmstadt



+49 6151 16 - 24401 or 24402


+49 6151 16 - 24404




degenhardt (at) gsc.tu...

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