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In this paper we consider a two-hop relay network consisting of a source, a destination and multiple relay nodes. For a given quality of service (QoS) requirement such as transmission rate between the source and the destination, relay nodes have an adaptive power control scheme to meet the QoS requirement. The adaptive power control scheme is assumed to be based on the channel condition between relay...
We address in this paper the quality of service (QoS) constrained radio resource allocation problem at the downlink of multiuser multicarrier systems. Based on the trade-off between energy consumption and transmit power within a cross physical and link layer system model, which jointly considers power allocation, adaptive modulation and coding and ARQ/HARQ retransmission protocols, a transmit power...
In order to improve the communication quality in practical network coding system, three main strategies are proposed to protect the encoding vectors, which includes importing cyclical redundancy into the encoding vectors of the coded packets, executing distributed space-time code to the encoded packets and a shift between the above two modes above according to different signal-noise ratios. And then...
A decentralized link adaptation algorithm designed for multi-link MIMO interference systems to jointly optimize the power and the number of links is presented in this contribution. Game theory is adapted and used for both allocating resources and admitting users (i.e. with embedded congestion control). The MIMO interference system is mapped into a multi-player game. The solution of the proposed game...
In this paper, we consider robust transmit strategies, against the imperfectness of the channel state information at the transmitter (CSIT), for multi-input multi-output (MIMO) communication systems. Following a worst-case deterministic model, the actual channel is assumed to be inside an ellipsoid centered at a nominal channel. The objective is to maximize the worst-case received signal-to-noise...
In this paper, we consider a heterogeneous network, where objects of different kinds can ensure some amplify and forward function. In this case, objects can have different characteristics. We propose a thorough study of the energy consumption, taking into account efficiencies of the transmitter and relays. Given a quality of service, we minimize the global consumption and evaluate the impact of the...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
Energy-efficiency is a key problem in wireless sensor networks(WSNs) due to the severe power constraint of wireless nodes. When designing protocols for WSNs, it is important for us to consider not only network performance, but also energy consumption. It is difficult for a traditional layered design method to satisfy several objectives at the same time. In this paper, we introduced a cross-layer scheme...
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