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Recently, the integration of WLAN network and cellular network is one of the most important research contents in wireless communications, and load balancing is the main technique and research highlight of such network. Compared with game theory, policy algorithm, gray analyses, fuzzy logic algorithm fits for the problem of multiple in multiple out in load balancing and enhance system robustness as...
In recent years, ultra-wideband (UWB) technique was considered as a candidate for short range high data rate communications with precise location and positioning ability at the order of centimeter, and many contributions have been presented by researchers, which promoted the development of UWB technique. In this paper, the state of the art and new development of UWB technique was presented in terms...
Recently proposed cooperative spectrum sensing method suggests that Cognitive Radio (CR) users can detect the primary users at low SNR with less time and higher accuracy through user cooperation. However, previous works assume CR users can acquire fully channel state information by pilot symbols, which is impractical. In this paper, the performance with imperfect channel estimation in cooperative...
This paper investigates a novel narrowband interference (NBI) suppression method in Cognitive Ultra-wide Band (CUWB) Radio system. UWB signals and NBI are separated by Fractional Fourier Transform (FRFT) domain filters, and therefore an estimation of NBI can be obtained by utilizing inverse FRFT. The simulation results show that the UWB pulse waveform designed by Semi-definite Programming (SDP), which...
The stability and reliability of routing protocols in existence can not be adapted to mobile ad hoc networks (MANET) well enough. In this paper, a novel ant colony routing algorithm is proposed and evaluated to reduce the overhead and enhance the network stability for MANET. The thought of design came into being based on the way of ants foraging and work dividing. By making a global correction on...
Power control techniques are adopted in narrow-band systems to overcome near-far effects by varying transmitted power levels so that all signals are received with equal power level. However, since the transmission data rate is too high in ultra-wideband (UWB) in which multimedia communication is desired to realize, it is impossible to accomplish perfect power control with current technologies and...
In this paper, we present a scheme for handoff ordering and reduction by using location information and trajectory prediction of a mobile terminal as mobile devices of the future are likely to be equipped with accurate positioning and advanced data processing capabilities, we used this new feature for mobility predictions based on road topology information and change in received signal strength (DeltaRSS)...
In this paper, we propose a novel cross-layer scheme for packet fast forward protocol in mobile ad hoc networks called the PFFMAC (packet fast forward MAC) protocol. PFFMAC is a cross-layer solution in which the MAC layer chooses different packet forward processes according to the routing table by estimating middle nodes. In PFFMAC, packet forward process in MAC layer is dynamically adjusted from...
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