Tomas Uricar

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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 nonuniform 2-slot constellation alphabets. These novel constellation alphabets outperform traditional linear modulation schemes in(More)
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)
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)
A majority of the research results on Wireless Network Coding (WNC) considers only a basic 2-Way Relay Channel (2-WRC) system scenario, where the Complementary Side Information (C-SI) is naturally available at both destinations. Although an extension of the WNC principles from the 2-WRC system to the butterfly network could seem relatively straightforward,(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 MultipleAccess 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)
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 of(More)
Wireless Physical Layer Network Coding (WNC) techniques exploit the inherent nature of wireless channels to improve the performance of wireless communication systems. Contrary to the conventional Network Coding, in WNC the transmitted signals are constructively interacting directly in the constellation space, thus inducing a specific requirements on the(More)
In this paper, we focus on the design of a reliable communication scheme for generic 5-node wireless butterfly networks (WBN). Since the WBN represents a natural extension of the basic two-way relay communication channel, we follow the paradigm ofWireless Physical Layer Network Coding and we show that the design of novel adaptive constellations is desirable(More)
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