TY - GEN
T1 - An efficient subcarrier assignment algorithm for downlink OFDMA
AU - Lengoumbi, Carle
AU - Godlewski, Philippe
AU - Martins, Philippe
PY - 2006/1/1
Y1 - 2006/1/1
N2 - In this paper, the Rate Adaptive optimization (RA) problem, which maximizes the sum of user data rates subject to total power constraint and individual guaranteed rates, is considered. Two tasks are commonly examined: bandwidth allocation and specific subcarrier assignment. A mechanism to provide a degree of fairness among users is coupled with the first task. Considering the second task, a novel algorithm, Rate Profit Optimization algorithm (RPO), is defined to assign specific subcarriers to different devices of a multiuser downlink OFDM system. In RPO, a new approach is proposed to assign a conflicting subcarrier (best subcarrier for several users). This algorithm is shown to exhibit good results regarding spectral efficiency and fairness with a complexity significantly lower than the Hungarian algorithm.
AB - In this paper, the Rate Adaptive optimization (RA) problem, which maximizes the sum of user data rates subject to total power constraint and individual guaranteed rates, is considered. Two tasks are commonly examined: bandwidth allocation and specific subcarrier assignment. A mechanism to provide a degree of fairness among users is coupled with the first task. Considering the second task, a novel algorithm, Rate Profit Optimization algorithm (RPO), is defined to assign specific subcarriers to different devices of a multiuser downlink OFDM system. In RPO, a new approach is proposed to assign a conflicting subcarrier (best subcarrier for several users). This algorithm is shown to exhibit good results regarding spectral efficiency and fairness with a complexity significantly lower than the Hungarian algorithm.
KW - Fairness
KW - OFDMA
KW - Rate Adaptive optimization
KW - Subcarrier assignment
U2 - 10.1109/VTCF.2006.264
DO - 10.1109/VTCF.2006.264
M3 - Conference contribution
AN - SCOPUS:34548846677
SN - 1424400635
SN - 9781424400638
T3 - IEEE Vehicular Technology Conference
SP - 1258
EP - 1262
BT - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 64th IEEE Vehicular Technology Conference, VTC 2006-Fall
Y2 - 25 September 2006 through 28 September 2006
ER -