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In this paper, multiple compression algorithms have been compared and in accordance with the characteristics of the session initiation protocol (SIP), empel-ziv-storer-szymanski (LZSS) is selected as the basic algorithm for the SIP signaling compression (SigComp) in IP Multimedia Subsystem (IMS). In order to further enhance the SIP SigComp ratio, the LZSS(More)
Based on the protocol of IEEE 802.11 for ad hoc networks, the distributed coordination function (DCF) of ad hoc networks was modified, and an adaptive minimum contention window binary exponential backoff algorithm (AWBEB algorithm) was presented. We use a 2D Markov chain model to educe the stationary distribution probabilities and the probability that a(More)
Partial transmit sequences (PTS) seems to be attractive for peak to average power ratio (PAPR) reduction in OFDM system, since it obtains better PAPR property by modifying OFDM signals without distortion. Meanwhile it also shows the potential to be utilized in MIMO-OFDM system. In this paper, a dynamic PTS algorithm with a simplified minimum maximum(More)
In this paper, we introduce an improved self-adaptive localization algorithm based on DV-HOP for the node localization in wireless sensor network. We firstly divide the sensing area into several small regions according to the density of unknown nodes. Then, the beacon nodes are distributed within the sensing area in a reasonable manner, based on DV-HOP(More)
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