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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Dan Nguyen Le-Nam Tran Pirinen, P. Latva-aho, M. |
| Copyright Year | 2014 |
| Description | Author affiliation: Dept. Commun. Eng., Univ. of Oulu, Oulu, Finland (Dan Nguyen; Le-Nam Tran; Pirinen, P.; Latva-aho, M.) |
| Abstract | We study the joint subcarrier allocation and pre-coder design (JSAPD) problem to maximize the sum rate of downlink orthogonal frequency division multiple access (OFDMA) systems under a sum power constraint. Naturally, this problem belongs to a class of combinatorial optimization problems which are difficult to solve in general. Based on the concept of big-M formulation, and by exploiting its specific structure, we can transform the JSAPD problem into a mixed integer second order cone program (MI-SOCP), which then offers two advantages. Firstly, when the number of subcarriers/users is small, the design problem can be solved to global optimum in reasonable time by dedicated solvers. Secondly, when the number of subcarriers/users is large, near-optimal solutions of the JSAPD problem can be found by considering the continuous convex relaxation of the MI-SOCP. Numerical experiments are carried out to demonstrate the improved performance of the proposed designs compared to known solutions. |
| Starting Page | 1248 |
| Ending Page | 1252 |
| File Size | 149126 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781479930838 |
| DOI | 10.1109/WCNC.2014.6952328 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-04-06 |
| Publisher Place | Turkey |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Resource management Signal to noise ratio Downlink OFDM Wireless communication Optimization Three-dimensional displays |
| Content Type | Text |
| Resource Type | Article |
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