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In this work, the combination of one-way and two-way relaying is examined in a scenario where two multi-antenna nodes exchange information under an asymmetric rate constraint via a half-duplex non-regenerative multi-antenna relay. Two-way relaying overcomes the multiplexing loss of one-way relaying, but additional optimizations are required to fulfill the asymmetric rate constraint. To enable the...
In this paper, frequency-domain relay processing in a two-hop transmission system is investigated. The relay is constrained to be "non-regenerative"; that is, the relay is only allowed to perform a symbol-by-symbol memoryless transformation of its received signals. Multicarrier modulation, e.g., orthogonal frequency division multiplexing (OFDM), is utilized to convert each hop into a collection...
We consider cooperative relaying systems employing amplify-and-forward (AF) distributed space-time block codes (DSTBCs) in which only backward channel-state-information (CSI) is known at relays and destination. For such systems, we study the particular case where, in order to minimize overhead, each of N relays decide independently whether to join the cooperation with basis on the received signal...
As the degree distribution of fountain codes plays a key role in affecting their performance, this paper presents a designing method of degree distribution based on the characteristics of relay systems, and optimizes the fountain codes in 3GPP. Simulation results show that the designed fountain codes have a good decoding performance in relay systems, compared to the fountain codes in 3GPP. In the...
In this work the transmit covariance matrix optimization problem for the MIMO Gaussian bidirectional broadcast channel is studied. A half-duplex relay node establishes bidirectional communication between two nodes using a decode-and-forward protocol. In the initial multiple access phase both nodes transmit their messages to the relay node. In the succeeding phase the relay broadcasts an optimal re-encoded...
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