title   
  

Throughput optimal multi-user scheduling via hierarchical modulation

Karaca, Mehmet and Erçetin, Özgür (2012) Throughput optimal multi-user scheduling via hierarchical modulation. IEEE Wireless Communications Letters, 1 (3). pp. 245-248. ISSN 2162-2337

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Official URL: http://dx.doi.org/10.1109/WCL.2012.033012.120008

Abstract

We investigate the network stability problem when two users are scheduled simultaneously. The key idea is to simultaneously transmit to more than one users experiencing different channel conditions by employing hierarchical modulation. For two-user scheduling problem, we develop a throughput-optimal algorithm which can stabilize the network whenever traffic load is stabilizable (i.e., it is within the achievable rate region.) In addition, we analytically prove that the proposed algorithm achieves larger achievable rate region compared to the conventional Max-Weight algorithm which employs uniform modulation and transmits to a single user. We demonstrate the efficacy of the algorithm on a realistic simulation environment using the parameters of High Data Rate protocol in a Code Division Multiple Access system. Simulation results show that with the proposed algorithm, the network can carry higher traffic load with lower delays.

Item Type:Article
Uncontrolled Keywords:Max-weight scheduling , hierarchical modulation , power allocation , queue stability , stochastic control
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
ID Code:19815
Deposited By:Özgür Erçetin
Deposited On:17 Oct 2012 12:38
Last Modified:17 Oct 2012 12:38

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