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In this paper, we propose an anti-interference cooperative spectrum sharing strategy based on fairness secondary users selection where the secondary system can gain spectrum access to the primary system. Specifically, secondary user STb and STq are selected to transmit the primary and secondary signal by using different bandwidth in the second transmission slot which occupies a part of the whole transmission...
Cognitive radio has the potential to improve spectrum efficiency and to alleviate spectrum scarcity by opportunistically utilizing un-utilized or under- utilized spectrum. A cognitive radio device needs to monitor primary user (PU) activities to identify white spaces and utilize spectral opportunities for transmission, without significantly affecting the PU performance. Additional challenges exist...
Based on the characteristics of cognitive radio (CR) and the transmission features of OFDM, this article offers the algorithms for the spectrum allocation in OFDM. Aiming at the probability of detection by the CR and the upper limit of the noise which can be suffered by the authorized user, CR achieves the maximal channel capability through the allocation of the sub-carriers and the power. This article...
Capacity limitation is one of the fundamental issues in wireless mesh networks. This paper addresses capacity improvement issues in multi-radio multi-channel wireless mesh networks. Our objective is to find a dynamic channel assignment and link schedule that maximizes the network capacity for ftp-type applications and video-type applications, respectively. Specifically, we minimize the number of time...
In this paper, we explore the use of partially overlapped channels in wireless mesh networks that consist of multiple 802.11-based access points. We propose novel channel allocation and link scheduling algorithms in the MAC layer to enhance network performance. Due to different traffic characteristics in multi-hop WMNs compared to those in one-hop 802.11 networks, we perform our optimization based...
In this paper, we propose an improved resource reservation algorithm ESRPT (enhanced shortest remaining processing time) for bursty traffic based on IEEE 802.15.3 standard. In this algorithm, each transmitter reports current fragments number of the first MSDU (MAC service data unit) and all of the fragments number of the remainder MSDUs in the pending transmission queue to PNC (piconet coordinator)...
IEEE 802.15.3 high-rate wireless personal area network (WPAN) has been emerged in order to support quality of service (QoS) for real-time multimedia traffic and high data rate wireless connectivity. In IEEE 802.15.3 MAC, TDMA is used to achieve channel scheduling. It's a crucial issue to effectively allocate channel time for each stream during every superframe for multimedia services. This paper proposes...
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