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MaxSNR scheduling is acknowledged as the reference resource allocation for multiuser OFDM wireless networks. Well adapted to the wireless environment, MaxSNR opportunistically considers the channel state and fights the multipath fading negative effects. Taking advantage of multiuser diversity, MaxSNR scheduling is well-known for maximizing the global cell throughput. However, throughput maximization...
In this paper a new permutation zone which combines adjacent and distributed subcarrier permutation is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) systems. For such purpose two types of burst are defined: localized and distributed. A new resource allocation and scheduling algorithm that exploits such structure is then proposed. Furthermore, the effects of limited feedback are...
The challenge of our work is to enhance the effectiveness of packet retransmission in multi-user OFDMA based communication systems. Based on information theory, we propose a retransmission scheduler (re-scheduler) that recomputes the allocation of chunks for negatively acknowledged packets only when correct packet decoding is impossible or it requires a too large number of retransmissions. Our proposal...
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...
This paper proposes a time-frequency scheduling algorithm to maximize the satisfaction of users served by an orthogonal frequency division multiple access (OFDMA) system. The satisfaction oriented resource allocation (SORA) algorithm takes into account in its formulation the channel quality, quality of service (QoS) requirements and effect of past allocations, so as to select, in an intelligent way,...
In this paper we study the traditional resource allocation model in IEEE802.16e (mobile WiMax) and propose two algorithms for scheduling and mapping higher layer data into the basic resource allocation units (slots) of OFDMA frames in IEEE802.16e. Both scheduling and mapping approaches are based on the quality of service requirements of each service flow in terms of data rate and bit error rate (BER)...
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