Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System
<p/> <p>Orthogonal frequency division multiplexing (OFDM) multihop system is a promising way to increase capacity and coverage. In this paper, we propose an optimally joint subcarrier matching and power allocation scheme to further maximize the total channel capacity with the constrained...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2008-01-01
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| Series: | EURASIP Journal on Advances in Signal Processing |
| Online Access: | http://asp.eurasipjournals.com/content/2008/241378 |
| _version_ | 1818033560819335168 |
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| author | Wang Wenyi Yan Shefeng Yang Shuyuan |
| author_facet | Wang Wenyi Yan Shefeng Yang Shuyuan |
| author_sort | Wang Wenyi |
| collection | DOAJ |
| description | <p/> <p>Orthogonal frequency division multiplexing (OFDM) multihop system is a promising way to increase capacity and coverage. In this paper, we propose an optimally joint subcarrier matching and power allocation scheme to further maximize the total channel capacity with the constrained total system power. First, the problem is formulated as a mixed binary integer programming problem, which is prohibitive to find the global optimum in terms of complexity. Second, by making use of the equivalent channel power gain for any matched subcarrier pair, a low complexity scheme is proposed. The optimal subcarrier matching is to match subcarriers by the order of the channel power gains. The optimal power allocation among the matched subcarrier pairs is water-filling. An analytical argument is given to prove that the two steps achieve the optimally joint subcarrier matching and power allocation. The simulation results show that the proposed scheme achieves the largest total channel capacity as compared to the other schemes, where there is no subcarrier matching or no power allocation.</p> |
| first_indexed | 2024-12-10T06:25:13Z |
| format | Article |
| id | doaj.art-089de62b21c44c3493a223f67d4ae59d |
| institution | Directory Open Access Journal |
| issn | 1687-6172 1687-6180 |
| language | English |
| last_indexed | 2024-12-10T06:25:13Z |
| publishDate | 2008-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Advances in Signal Processing |
| spelling | doaj.art-089de62b21c44c3493a223f67d4ae59d2022-12-22T01:59:14ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802008-01-0120081241378Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop SystemWang WenyiYan ShefengYang Shuyuan<p/> <p>Orthogonal frequency division multiplexing (OFDM) multihop system is a promising way to increase capacity and coverage. In this paper, we propose an optimally joint subcarrier matching and power allocation scheme to further maximize the total channel capacity with the constrained total system power. First, the problem is formulated as a mixed binary integer programming problem, which is prohibitive to find the global optimum in terms of complexity. Second, by making use of the equivalent channel power gain for any matched subcarrier pair, a low complexity scheme is proposed. The optimal subcarrier matching is to match subcarriers by the order of the channel power gains. The optimal power allocation among the matched subcarrier pairs is water-filling. An analytical argument is given to prove that the two steps achieve the optimally joint subcarrier matching and power allocation. The simulation results show that the proposed scheme achieves the largest total channel capacity as compared to the other schemes, where there is no subcarrier matching or no power allocation.</p>http://asp.eurasipjournals.com/content/2008/241378 |
| spellingShingle | Wang Wenyi Yan Shefeng Yang Shuyuan Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System EURASIP Journal on Advances in Signal Processing |
| title | Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System |
| title_full | Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System |
| title_fullStr | Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System |
| title_full_unstemmed | Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System |
| title_short | Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System |
| title_sort | optimally joint subcarrier matching and power allocation in ofdm multihop system |
| url | http://asp.eurasipjournals.com/content/2008/241378 |
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