2006, Volume 8, Issue 3
Strategic Study of CAE >> 2006, Volume 8, Issue 3
United Algorithm for Dynamic Subcarrier, Bit and Power Allocation in OFDM System
Communication and Information Engineering Institute , Nanjing University of Posts and Telecommunications , Nanjing 210003 , China
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Abstract
A realtime united algorithm for dynamic subbcarrier, bit and power allocation according to the change of channel (UA) is presented in this paper, which can be used into the down-link of multi-user orthogonal frequency division multiplexing (OFDM) system. With the algorithm the total transmission power is the minimum while the data rate of each user and the required BER performance can be achieved. Comparing to the subcarrier allocation algorithm (WSA) , the simulation results show that the algorithm presented in this paper has better performance while both have equal calculating complexity.
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References
[ 1 ] Cheong Y W, Cheng R S, Lataief K B, et al. Multiuser OFDM with adaptive subcarrier, bit, and power allocation [J]. IEEE J Selected Areas Comm, 1999, 17 (Oct)： 1747 ~ 1758
[ 2 ] Wong C Y, Tsui C Y, Cheng R S, et al. A realtime sub -carrier allocation scheme for multiple access downlink OFDM transmission [R]. IEEE VTC’99, 1999
[ 3 ] Khun H W. TTie Hungarian method for the assignment problem [j]. Naval Research Logistics, 1955, (2) ： 83 ~ 97
[ 4 ] Recommendation ITU - R. M. 1225. Guidelines for Evaluation of Radio Transmission Technologies for IMT - 2000 [S]. Recommendation ITU -RM 1225, 1997
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