Optimal joint probing and transmission strategy for maximizing throughput in wireless systems
Optimal joint probing and transmission strategy for maximizing throughput in wireless systems
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DOI：
10.1109/jsac.2008.081020
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发表时间：
2008-10
影响因子：
16.4
通讯作者：
P. Chaporkar;A. Proutière
中科院分区：
文献类型：
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作者：
P. Chaporkar;A. Proutière
在广播衰落信道中，可以通过所谓的多用户分集和机会调度来利用信道变化来提高系统性能。为了实现这种分集所承诺的增益，发射机必须准确地跟踪各种接收机的信道变化，这消耗了资源（时间、能量、带宽），从而减少了用于有效数据传输的剩余资源。发射机可以决定不获取或探测某些接收机的信道条件，因为这些接收机可能正在经历严重的衰落，或者因为发射机希望为数据传输腾出资源。它也可以决定发送到接收器而不探测其信道;在这种情况下，发送器猜测信道状态，这通常导致与发送器知道信道状态时相比传输速率的降低。最后，发送器必须决定它应该发送到哪个接收器。在本文中，我们确定联合探测和传输策略，实现信道状态获取和有效的数据传输之间的最佳权衡。目标是最大化系统吞吐量。最后，我们提出了所提出的策略的几个扩展，包括计划，以最大限度地提高系统的效用和计划，以确保系统的稳定性。
In broadcast fading channel, channel variations can be exploited through what is referred to as multi-user diversity and opportunistic scheduling for improving system performance. To achieve the gains promised by this kind of diversity, the transmitter has to accurately track the channel variations of the various receivers, which consumes resources (time, energy, bandwidth), and thus reduces the resources remaining for effective data transmissions. The transmitter may decide not to acquire or probe the channel conditions of certain receivers, either because these receivers are presumably experiencing severe fading, or because the transmitter wishes to spare resources for data transmissions. It may also decide to transmit to a receiver without probing its channel; in such cases, the transmitter guesses the channel state, which often results in a reduction of the transmission rate compared to when the transmitter knows the channel state. Ultimately, the transmitter has to decide to which receiver it should transmit. In this paper, we identifying the joint probing and transmission strategies realizing the optimal trade-off between the channel state acquisition and the effective data transmission. The objective is to maximize the system throughput. Finally, we propose several extensions of the proposed strategy, including a scheme to maximize the system utility and a scheme to ensure the system stability.