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The following topics are dealt with: wireless communication; mobile communication; RFID; software engineering; network management; telematics; communication network planning; USN; information security; mobile internet; digital broadcasting; digital home technology; E-commerce; optical communication; distributed computing and web technology.
A channel prediction method using the estimation of Doppler spectrum is proposed and investigated to predict channel state information in time varying channel. Because the Doppler frequency is one of main features for time varying channel characteristics, the autoregressive model for the Doppler spectrum could be employed to get reliable channel prediction coefficients. For the IIR approximation of...
The growing needs to support efficient data communications in wireless sensor networks (WSN) cannot be ignored. The resource constrained nature of WSN requires it to efficiently transmit the data with little consumption of network resources. We present a gossip based K - BackTrack (KBT) reliable data dissemination protocol for unstructured ad-hoc WSNs1. The goal of our proposed protocol is to ensure...
We study the gain of dirty paper coding (DPC) by investigating the sum rate as the number of antennas at the transmitter grows in a multi-user MISO broadcast channel. We show a comparative sum rate gain of DPC over the zero forcing (ZF) scheme. The sum rate gap between DPC and ZF is analyzed assuming asymptotically high signal-to-noise ratio (SNR) in the case when the number of users is the same as...
This paper analyzes saturation throughput variation quantitatively over Rayleigh or Ricean fading channels under the CSMA/CA (carrier sense multiple access/collision avoidance)-based DCF (distributed coordination function) protocol at the MAC layer in the 802.11a wireless LAN. We find the fact that when the ratio of direct-to-diffuse signal power is increased, the saturation throughput is increased...
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