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This paper investigates the network resource allocation in multiuser downlink wireless systems where the base station and the mobile stations are equipped with multiple antennas to provide fair and efficient transmission services to the mobile users. We focus on packet scheduling, given that it has a significant impact on the overall performance of a multiple-input-multiple-output (MIMO) system. Most...
This paper investigates the spatial multiuser scheduling strategies that apply different pairing criteria to select a pair of users carrying out transmission simultaneously in virtual MIMO (VMIMO) systems. Five kinds of criteria are described and compared, which are categorized as channel correlation minimization, bit error rate (BER) minimization and capacity maximization depending on their diverse...
In this paper, we propose a cross-layer packet scheduling scheme for multi-service MIMO system which adopts a unified method to select the set of users to transmit to and the antennas over which users send their packets. Our proposed scheduling scheme makes a difference between RT(real time) and non-RT (non-real time) services. It defines the utility functions of RT services according to a modified...
Packet scheduling at the data link layer may impact significantly the overall performance of a wireless system using multiple antennas. In this paper, we propose a novel packet scheduling scheme based on proportional fairness that considers the traffic arrival process with different packet lengths for the downlink of multiple-input multiple-output (MIMO) multi-user systems. We also provide analysis...
In this paper, we present a performance analysis of user scheduling for multiuser MIMO systems exploiting the multiuser and antenna diversities while maintaining the fairness among the users. We consider different scheduling schemes including absolute throughput-based scheduling, absolute SNR-based scheduling, and normalized SNR-based scheduling schemes. We also propose the utilization of an antenna...
The paper describes a low complexity tree-structure based user scheduling algorithm in a MLD-based multi-user multiple-input multiple-output (MIMO) wireless systems. An M-branch selection algorithm, which selects M most-possible best branches at each step, is proposed to maximize the whole system sum-rate capacity. To make this work more feasible, some implementation problems such as complexity reduction,...
In this paper, we consider a new channel probing scheme for opportunistic scheduling in the uplink of orthogonal frequency division multiplexing (OFDM)-based wireless systems. To reduce signaling overhead for the probing, we consider a two-step channel probing process; called pre-probing and mainprobing. Good subchannels are first estimated through the pre-probing process using a probing signal transmitted...
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