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In recent years, there has been great interest from the cellular service providers to use the unlicensed spectrum for their service offerings. On the other hand, existing unlicensed users in these bands (e.g., Wi-Fi in the 5-GHz band) have serious concern that such coexistence will jeopardize their service quality. Although there are some proposals on how to achieve coexistence, they are driven by...
The paper investigates how to minimize cooperative power consumption for the coexistence of heterogeneous multi-hop networks. We formulate a multiobjective optimization problem for the total power consumption of the two heterogeneous multi-hop networks and reformulate the nonlinear constraint to be linear. The optimal power curve — the minimum power consumption for both two heterogeneous multi-hop...
The goal of this paper is to investigate the effects that take place after replacing an omni-directional antenna with a directional one at transmitter of a node of a wireless multihop, one-initial-source, one-final-destination, (N-1) relays network. Specially, we consider a cost-efficient one-way communication where a directional antenna at transmitter of a node is deployed to eliminate of possible...
Combined with the temperature and gas monitoring demand, a new technology which is called wireless sensor network is used to solve the problems exiting in most cable transmission systems. Base on designing of wireless sensor networks low-power hardware platform using CC2430 and transplanting TinyOS wireless sensor nodes, the design of components are completed by analyzing the system applications platform...
Based on free probability theory, a new scheme for frequency band sensing of spreading communication system is proposed. Unlike previous studies in the field, the new scheme does not require the knowledge of the spreading sequences of users and is related to the asymptotic free behavior of random matrices. Simulation result shows that the convergence characteristic holds true even for a small number...
As proven by the success of OFDM for wireless communications, multicarrier modulation is becoming the chosen modulation technique. Waveform bases other than sine functions could similarly be used for multicarrier systems in order to provide an alternative to OFDM. From this point of view, this paper will propose a novel approach to transmit parallel information by wavelet packet transform modulation...
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