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Due to the unreliable nature of wireless links, sensor nodes frequently encounter degraded performance or lack of connection. This paper provides a real-time status monitoring and channel error diagnosis method in a wireless sensor network. It uses a poll and echo procedure to efficiently collect some physical layer and link layer statistics from both transmitter side and receiver side. A machine...
In this paper, we propose a novel anti- eavesdropping scheme by introducing friendly jammers to a wireless network of things (WNoT). In particular, we establish a theoretical framework to evaluate the eavesdropping risk of WNoT with friendly jammers and the eavesdropping risk of WNoT without jammers. Our theoretical model takes into account various channel conditions such as the path loss and Rayleigh...
In wireless networks, determining the error bit positions within a packet at the receiver can improve the wireless retransmission efficiency in wireless communications. In this paper, we propose an Error Position Estimating Coding (EPEC) scheme based on Error Estimating Coding (EEC). Specifically, we divide data bits into several groups and indicate the group number individually to implement error...
Based on the works of S-W Lei and V.K.N. Lau, we propose a novel adaptive interleaving scheme for the application in orthogonal frequency division multiplexing (OFDM) systems. The new scheme has improved the original one in the following two aspects: (1) We have derived the equivalent bit level channel state information thus the symbol level interlever is changed to the bit level; (2) We have modified...
We propose a novel adaptive interleaving scheme for orthogonal frequency division multiplexing (OFDM) systems. Based on the channel state information, the approach selects one interleaver from a pool of candidate interleavers. As the selected one is expected to have larger minimum Euclidean distance (MED) at receiver, the technique can significantly improve the decoding error rate performance. Compared...
Wireless ad hoc networks have been employed in pervasive computing, rescue and so on. Employing MIMO spatial multiplexing in ad hoc networks, multiple links in the same neighborhood could coexist and multiple RTS/CTS contention slots are required to contest medium. The RTS/CTS contention is a severe overhead that mitigates the performance improvement. The transmission power, which determines the number...
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