| Mao Xu(毛旭),Ji Hong,Li Ming,Fu Jiadi.[J].高技术通讯(英文),2011,17(1):69~74 |
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| Subcarrier and power allocation in OFDM-based cognitive radio networks |
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| DOI： |
| 中文关键词: |
| 英文关键词: cognitive radio (CR), orthogonal frequency division multiplexing (OFDM), iterative water-filling, low-complexity, capacity maximization, fairness |
| 基金项目: |
| Author Name | Affiliation | | Mao Xu(毛旭) | | | Ji Hong | | | Li Ming | | | Fu Jiadi | |
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| 中文摘要: |
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| 英文摘要: |
| We formulate the subcarrier and power allocation problem in cognitive radio networks employing orthogonal frequency division multiplexing (OFDM) as a non-linear optimization problem with the objective of maximizing sum capacity under constraints of available subcarriers, interference temperature, power budget, etc. A close-to-optimal solution with much reduced complexity is proposed to separate the problem into two steps, which also considers fairness among secondary users. A fair algorithm for subcarrier allocation (FA_SA) is firstly presented. Secondly, a fast iterative water-filling algorithm for power allocation (FIWFA_PA) is also proposed to maximize the sum capacity. Extensive simulation results show that sum capacity performance of our low-complexity solution is very close to the optimal one, while significantly improving fairness and reducing computation complexity compared with the existing solutions. |
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