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Retransmission is the basic method to improve network reliability. Since the broadcasting character and unreliability of wireless links, we could apply the network coding to broadcast retransmission algorithm to improve the efficiency of retransmission. This article does a quantitative analysis for the performance of the wireless broadcast algorithm based on network coding from the delay perspective...
Retransmission based on packet acknowledgement (ACK/NAK) is a fundamental error control technique employed in IEEE 802.11-2007 unicast network. However the 802.11-2007 standard falls short of proposing a reliable MAC-level recovery protocol for multicast frames. In this paper we propose a latency and bandwidth efficient coding algorithm based on the principles of network coding for retransmitting...
In this paper, we propose a new multicast subgraph construction algorithm and a distributed source coding-based multicast (DSCM) protocol for multihop wireless networks. The DSCM emphasize reliability, rate optimality, and energy efficiency. Both algorithms are based on local knowledge of the network. DSCM uses rateless error correcting codes to provide reliability and rate optimality, and distributed...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
This paper studies efficient complex valued matrix manipulations for multi-user STBC-MIMO decoding. A novel method called Alamouti blockwise analytical matrix inversion (ABAMI) is proposed for the inversion of large complex matrices that are based on Alamouti sub-blocks. Another method using a variant of Givens rotation is proposed for fast QR decomposition of this kind of matrices. Our solutions...
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