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In this paper, we present singular-value decomposition- QR with threshold (SVD-QR-T) algorithm to select a subset of channels in virtual MIMO wireless sensor networks (WSN) in order to reduce its complexity and cost. SVD- QR-T selects best subset of transmitters while keeping all receivers active. The threshold is adaptive by means of fuzzy c-mean (FCM). Under the constraint of the same total transmission...
Interferences due to the hostile environment (e.g. jammer) and the multi-user access are critical factors affecting performance of the wireless sensor networks. In this paper, we study a hybrid frequency hopping/time hopping-pulse position modulated (FH/TH-PPM) UWB for wireless sensor networks in hostile environment with partial-band (PB) tone interference. FH and TH are both used to get as much diversity...
In this paper, we introduce a new method for packet transmission delay analysis and prediction in mobile ad hoc networks. We apply a fuzzy logic system (FLS) to coordinate physical layer and data link layer. We demonstrate that type- 2 fuzzy membership function (MF), i.e., the Gaussian MFs with uncertain variance is most appropriate to model BER and MAC layer service time. Two FLSs: a singleton type-1...
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