Tomas Uricar

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The unavoidable parametrization of the wireless link represents a major problem of the network-coded modulation synthesis in a 2-way relay channel. Composite (hierarchical) codeword received at the relay is generally parametrized by the channel gain, forcing any processing on the relay to be dependent on channel parameters. In this paper, we introduce the(More)
—In this paper we introduce the constellation alphabets suitable for bidirectional relaying in parametric wireless channels. Based on the analysis of hierarchical minimum distance, we present a simple design algorithm for the non-uniform 2-slot constellation alphabets. These novel constellation alphabets outperform traditional linear modulation schemes in(More)
straightforward, several new unconventional phenomena of the WNC arise (and need to be considered). First of all, the unreliable transmission of the C-SI can be overcome by an increased cardinality of the relay output. This opens a question how a suitable Hierarchical Network Code (HNC) mapper could be designed for a given quality of the C-SI link (and(More)
Although the 2-source wireless Butterfly Network (BN) represents a natural extension of the well-known 2-Way Relay Channel (2-WRC) scenario, a direct implementation of conventional Wireless Network Coding (WNC)/Physical Layer Network Coding (PLNC) principles in this network is not straightforward. While the information necessary for decoding of the desired(More)
/ Summary An immense number of mutually interacting nodes increases the complexity of wireless cloud networks design/analysis. This complexity is driven by an enormous amount of degrees of freedom in the system, which are available even if a logical network structure is clearly defined and channel characteristics are known (at least locally). These degrees(More)
—There are two key aspects affecting the performance of butterfly network with wireless network-coded relaying. The first one is the amount of Complementary Side Information (C-SI) at destinations and the second is given by a parametric Multiple-Access channel performance of source constellation alphabets. In this paper we show that the Non-uniform 2-slot(More)
—Favourable characteristics of wireless channels (including the inherent broadcast and superposition nature) provide a fertile ground for the extension of conventional Network Coding (NC) principles to wireless communication networks. However, the research of emerging Wireless (Physical layer) Network Coding (WNC) techniques have already revealed several(More)
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