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In this paper, a class of distributed space-time-frequency codes (DSTFCs) is proposed for broadband wireless relay networks. New DSTFCs employ subcarrier grouping and linear constellation precoding at the source node and distributed linear dispersion coding at the relay nodes, which can achieve both full spatial and multipath diversity. We further show that many existing coding constructions, including...
Coherent-states, representing electromagnetic radiation produced by physical devices such as lasers, are an important class of states for optical communications. For the coherent-state signal detection, a detection method basing on the POVM detection and the least-square estimation is proposed in this paper, concerning the quantum detection theory. This method has been proved to be effective in our...
The ability to encode information on a single photon in the form of orbital angular momentum (OAM) has lead to recent research in the field of free space communication and quantum information processing. Whilst, in principle, one has access to an infinite number of OAM states, the influence of atmospheric turbulence on the light's spatial structure compromises the information capacity of photons carrying...
The goal of this paper is to investigate the effects that take place after replacing an omni-directional antenna with a directional one at transmitter of a node of a wireless multihop, one-initial-source, one-final-destination, (N-1) relays network. Specially, we consider a cost-efficient one-way communication where a directional antenna at transmitter of a node is deployed to eliminate of possible...
Energy consumption in wireless communication includes amplifier energy consumption and circuit energy consumption. In short-distance communications, circuit energy consumption cannot be omitted. So, how to exploit the advantage of cooperative diversity in wireless communication becomes a crucial problem. In this paper, we consider the energy consumption in cooperative wireless sensor networks and...
Cooperative relay in cognitive radio networks (CRNs) can solve the problem of heterogeneity of spectrum availability among secondary users (SUs) by using relay nodes to bridge the transmitter and receiver exploiting channels common with them respectively. With the introduction of cooperative relay, power allocation over direct and relay channels at the source becomes a key problem that constraint...
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