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This paper presents an efficient decoding scheme for asynchronous physical network coding (PNC) network. The proposed scheme incorporates linear orthogonal projection method into the asynchronous PNC network to eliminate the impact of inter-symbol interference caused by imperfect synchronisation. In terms of the number of floating-point operations to decode per collided information packet at relay,...
Because of its simplicity, amplify-and-forward (AF) is one of the most popular cooperative relaying technique. Relays are used in cooperative communication to improve reliability, coverage or spectral efficiency of cell-edge users. However, relays tend to increase the interferences seen by users of adjacent cells, particularly by the cell-edge users, when used in multi-cell systems. In this paper,...
Amplify-and-forward (AF) is one of the most popular and simple approaches for transmitting information over a cooperative multi-input multi-output (MIMO) relay channel. In cooperative communication, relays are employed for improving the coverage or enhancing the spectral efficiency, especially of cell-edge users. However, in a multi-cell context, the use of relays will also lead to an increase in...
One approach to prolong the lifetime of a wireless sensor network (WSN) is to deploy some relay nodes to communicate with the sensor nodes, other relay nodes, and the base stations. The relay node placement problem for wireless sensor networks is concerned with placing a minimum number of relay nodes into a wireless sensor network to meet certain connectivity or survivability requirements. Previous...
In wireless sensor networks (WSNs) energy is a scarce resource which must be utilized efficiently in order to enhance the network lifetime. Two-tiered wireless sensor network (TT-WSN) architecture is proposed to improve the lifetime longevity of the network. In TT-WSN the lower tier consists of sensor nodes (SN), which are mainly responsible for sensing the environment and forwarding the data to its...
Energy-constraint is a crucial problem in wireless sensor networks (WSNs). Many sensor node (SN) placement schemes and routing protocols are proposed to address this problem. In this paper, we first present how to place SNs by use of a minimal number to maximize the coverage area when the communication radius of the SN is not less than the sensing radius, which results in the application of regular...
Wireless sensor networks are being geared up for applications that range from consumer markets to military industries. While the wireless sensors perform the same sensing task within the region of interest, there may be a lot of topological asymmetry with respect to their roles in other operational activities. Double tiered wireless sensor network (DWSN) is such kind of heterogeneous sensor network...
The relay node placement problem for wireless sensor networks is concerned with placing a minimum number of relay nodes into a wireless sensor network to meet certain connectivity and survivability requirements. In this paper, we study constrained versions of the relay node placement problem, where relay nodes can only be placed at a subset of candidate locations. In the connected relay node placement...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
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