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Multi-UAVs dynamic task allocation is a hot issue currently in the field of unmanned combat command and control. The dynamic task allocation problem for unexpected new tasks appear in battle field is the focus of this study. In order to fulfill the requirements of time and communication complexity, firstly, this paper establishes a state information model of UAV and UAV groups based on the grouping...
The OFDM transmission scheme is an efficient technique to overcome frequency-selective nature of wireless broadband channels. Different from existing methods which largely focus on data rate maximizaiton, in this paper we investigate resource allocation schemes to improve bit error rate (BER) performance in a point-to-point OFDM system subject to both throughput and transmit power constraints. Specifically,...
This paper proposes an optimal relay selection criteria based on the location of the relay (0 ≤ λ ≤ 1) relative to source and destination in the cooperative coded system. The proposed optimization algorithm employs distributed turbo product coding technique with hard and soft decoding. It is shown that the link quality depends on the location of the relay which in turn affects overall system Bit Error...
In this paper we investigate the effect of power allocation on the performance of the Distributed Turbo Product Code (DTPC) system. We study the error propagation on distributed coding systems when the relay makes erroneous decisions and present a simple power allocation method to alleviate the effect of relay decoding errors on the iterative decoding at the destination. We validate this method with...
A novel coordinated scheduling algorithm for OFDM-based systems in multi-cell scenario is proposed in this paper. The studied algorithm based on the utility function is general for the downlink of networks. The algorithm coordinates the subcarrier assignment over the BS cluster. We first establish the framework for this inter-cell coordinated optimization problem through utility-based method. The...
In this paper, we consider the unequal error protection (UEP) for progressive image transmission when the coded packet size is fixed. First, we prove that, for the source code with convex rate-distortion (R-D) function and practically used channel codes, the channel code rate for each packet in the optimal rate allocation is nondecreasing indeed. Then, we give an upper bound for the channel code rate...
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