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In this paper, we investigate the training problem of wireless local area networks (WLANs) with downlink multi-user multiple input multiple output (DL MU MIMO) capability. We extend the 802.11 MAC protocol and propose a few training protocols at the MAC layer to support DL MU MIMO. We provide a capacity analysis based on measurement results from an 802.11n systems, evaluate the overhead of these training...
IEEE 802.11 Wireless Local Area Network (WLAN) Physical Layer (PHY) offers multiple data rates. In multi-rate WLANs, 802.11 Medium Access Control (MAC) protocol, Distributed Coordination Function (DCF), essentially provides equal transmission opportunities to each sender host, causing the degradation of system throughput due to some hosts using low rates. In this paper we propose a cross-layer link...
Cooperative communications achieve tremendous improvements in system performance. Meanwhile, it tends to change the conventional access and transmission schemes in wireless networks. Thus, CoopMAC is proposed and analyzed for fully connected WLANs. It improves the performance of the network dramatically by enabling additional collaboration from other nodes. However, how does it work in multi-hop Ad...
Wireless local area networks (WLANs) provide mobility and convenience to users, the efficiency of today's WLANs are still far from satisfactory. In this paper discusses the performance of wireless Ad-Hoc networks, our main contribution is analyze transmission's power level to compare the throughput performance on simulation results. We describe NS-2 (Network Simulation) implementations for fine-tuning...
A new backoff algorithm is proposed to enhance the performance of the IEEE 802.11 distributed coordination function (DCF) which employs binary exponential backoff (BEB) algorithm. The proposed algorithm, called the low time delay-multiplicative increase-multiplicative/slow decrease (LTD-MMSD) backoff algorithm, is quite simple to implement while significantly improving the network performance over...
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