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The concept of bidirectional relaying is a key technique to improve the performance in future wireless networks. It applies to three-node networks, where a relay node establishes a bidirectional communication between two other nodes using a decode-and-forward protocol. It divides the whole communication into two phases, namely the multiple access and bidirectional broadcast phase. Here, we concentrate...
We consider the broadcast phase of a spectrally efficient two-phase decode-and-forward protocol which is used by a relay node to establish a bidirectional communication between two nodes. In the first phase the two nodes transmit their message to the relay node which decodes the messages. In the succeeding phase the relay node broadcasts a re-encoded composition of them. We consider imperfect channel...
Based on the results of the simulation of a deterministic multi-path propagation scenario it has been shown that for ultra wideband signals the received power does not show any fading characteristics but follows the simple log distance path loss model even in a dense multi-path environment. Furthermore, a similar log distance law has been derived for the channel capacity and a direct relation between...
In this paper we extend recent coding results by Datta and Dorlas on classical capacity of averaged quantum channels with finitely many memoryless branches to arbitrary number of branches. Only assumption in our approach is that the channel satisfies some weak measurability properties. Our approach to the direct coding theorem is based on our previous work on compound classical-quantum channels. The...
The problem of transceiver optimization in multiuser multiple-input multiple-output downlink wireless systems is considered. The base station is assumed to possess only estimated, erroneous values of channel coefficients. The exact channels lie in uncertainty regions, specified by the Frobenius norms of the error matrices. An iterative optimization of the transmit and receive filters is performed...
This paper presents an investigation on the fading characteristics occurring in ultra-wideband (UWB) transmission in a typical indoor propagation channel. The quantities of interest are the total received power and the channel capacity, which are calculated on the basis of ray-optical propagation simulations. From the obtained results it will turn out, that the channel capacity of ultra-wideband transmission...
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