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| Bit and Power Allocation Algorithm for OFDM System |
| Yu GuanDing;Zhang ChaoYang;Chou PeiLiang |
| Institute of Information and Communication Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract The maximization of data rate under the constraint of total transmit power and bit error rate is a considerable issue in OFDM system. Recognizing that the number of bits on each subcarrier must be a discrete number for real systems, this paper proposed two bit allocation algorithms which are modified greedy algorithm and water filling level binary searching algorithm. Simulation results show that the complexity of modified greedy algorithm is 10% of that of greedy algorithm and 5-7 iterations are enough for 0.5% data rate loss when SNR is above 10dB.
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Received: 08 April 2004
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2005, Vol. 27 
