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This paper proposes a novel admission control (AC) algorithm for guaranteed quality of service (QoS) to all users. The proposed solution provides better utilization of system capacity using adaptive modulation (AM). A scheduler based on a per user priority function is also given in this paper. The AC is given by allocating the exact number of slots for each user that will meet its QoS. For every new...
The future broadband wireless cellular systems evolved UTRAN (E-UTRAN) and WiMAX are receiving a lot of interest in recent years. Both systems deploy orthogonal frequency division multiplex (OFDM) physical layer consisting of large number of mutually orthogonal sub-carriers. This physical layer provides high robustness against multi-path effects, high flexibility in allocation of the physical resources,...
Orthogonal frequency division multiplex (OFDM) based wireless communication is becoming a standard for providing broadband wireless services. OFDM is already deployed in various WLAN systems such as 802.11 a/g/e and in the mobile WiMAX systems (802.16e). The OFDM physical layer is also considered by 3GPP for the long term evolution (LTE) of UMTS. The OFDM based physical layer enables a so-called orthogonal...
In order to fully exploit wireless radio resource and then increase spectrum efficiency, cognitive radios shall sense and cognize environments so that the secondary system(s) may coexist with primary communication systems. In this paper, we acquire an effective set of cognitive information under a proposed spectrum sensing cycle for orthogonal frequency division multiple access (OFDMA) systems. To...
Valiant's concept of randomized load balancing (RLB), also promoted under the name 'two-phase routing', has previously been shown to provide a cost-effective way of implementing overlay networks that are robust to dynamically changing demand patterns. RLB is accomplished in two steps; in the first step, traffic is randomly distributed across the network, and in the second step traffic is routed to...
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