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We consider a multicast scenario that involves an ad hoc network of cochannel multiple-input–multiple-output (MIMO) nodes in which a source node attempts to share a streaming message with all nodes in the network through some predefined multihop routing tree. The message is assumed to be broken down into packets, and the transmission is conducted over multiple frames. Each frame is divided into time...
In this paper, we present a novel definition of connectivity for ad hoc networks, and based on this definition, we propose a scheduling algorithm that can optimize the connectivity of the network through scheduling the active links into different time slots. We also propose an adaptive beamforming algorithm that reduces the impact of the co-channel interference on the links that transmit simultaneously...
This paper considers zero-forcing beamforming (ZFBF) at the transmitter for a downlink multi-user multiple-input single-output (MU-MISO) system. Transmit beamforming as a simple yet efficient technique can exploit the benefits of multiple transmit antennas provided that the instantaneous channel state information (CSI) is known at both sides of transmission link. In order to have such improvements,...
Owing to limited bandwidth, high bit error rate, and bursty error in the wireless environment, the performance of the transmission control protocol (TCP) degrades greatly in wireless networks. Up to now, many researchers have contributed greatly to the wireless TCP field. However, in most of their works, the wireless TCP module usually works in the TCP layer and has no idea of the actual time of the...
For multiuser MIMO system, zero forcing beamforming (ZFB) can be adopted to exploit the multiuser spatial multiplexing gain and diversity gain in downlink by spatial multiuser scheduling. On the other hand, multiuser joint subcarrier allocation can obtain multiuser diversity gain in frequency domain. In this paper, a novel joint spatial and frequency proportional fairness (SFPF) scheduler is proposed...
Through exploiting the multiuser diversity, the capacity of MIMO-OFDM system can increase dramatically. In multiuser singular value decomposition (MU-SVD) based MIMO-OFDM system, the scheduler can allow multiple users to simultaneously transmit independent data to base station (BS) on the same subcarrier and the data can be separated in space domain at the BS. In this paper the effect of the correlations...
For OFDMA system, the greedy subcarrier and bit loading can be adopted to exploit the multiuser diversity in frequency domain for the independent fading of different users and achieve higher cell throughput without considering the user fairness. Meanwhile in MIMO scenario, different UE experience independent spatial fading for different location, and thus the different antenna at the base station...
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