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Wireless multicast can exploit broadcast nature of wireless communication. It is sufficient to transmit information only once to reach a group of users. But some users may fail to receive it due to channel fading etc. Thus, we have to find a proper threshold of scheduling and retransmit in order to reduce the packet loss. In this paper, the multicast scheduling problem with packet loss and delay constraints...
Wireless multicast can exploit both multiuser diversity and broadcast gain together simultaneously, which are the special virtues of wireless communication. However, we have to adopt appropriate tradeoff between multiuser diversity gain and broadcast gain in order to achieve optimal system throughput. This paper studied the problem of wireless multicast scheduling, and proposed a static optimal wireless...
It is because the resources are geographic distributed, heterogeneous and dynamic in computational grid environments that makes QoS guided scheduling a complex and challenging problem, especially when the tasks have multiple QoS needs. The economic model was applied to solve the resource allocation problem controlled by QoS in grid. Integration function is used to quantitative QoS, which aims to achieve...
Orthogonal frequency division multiple access (OFDMA) is an emerging multiple access technology. In this paper, we focus on the packet scheduling problems of the downlink of OFDMA wireless systems with delay requirements. We revised three different scheduling methods in order to reduce their complexity for practical application based on limited feedback. Furthermore, we simulate these algorithms under...
A cross-layer design based on precoding and partial feedback for multiuser MIMO-OFDM systems is presented in this paper. First, we design precoder vectors with partial feedback in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels. Then we can divide the radio resource into many space-time-frequency (STF) three dimension resource units. Then we present a...
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