Beamforming is a kind of signal processing technique which can improve system performance in the multiple-input multiple-output(MIMO)systems.In this paper,the problem of allocating subcarriers in MIMO-OFDMA wireless s...Beamforming is a kind of signal processing technique which can improve system performance in the multiple-input multiple-output(MIMO)systems.In this paper,the problem of allocating subcarriers in MIMO-OFDMA wireless systems was analyzed,and a scheme to allocate subcarriers among all users based on beamforming was proposed to maximize the signal-to-noise ratio(SNR)at the receiver.Statistical properties of the channel matrix were studied,and some beneficial results were got.Statistical channel state information(CSI)was also taken into account to simulate more practical systems.Simulation results show that the proposed allocating scheme is effective,and it is robust to the influence of delayed CSI.展开更多
MIMO-OFDMA is a promising technique for future broadband wireless communication systems. In this paper, the problem of allocating subcarriers among different users to maximize the total capacity is addressed. The opti...MIMO-OFDMA is a promising technique for future broadband wireless communication systems. In this paper, the problem of allocating subcarriers among different users to maximize the total capacity is addressed. The optimal solution can be obtained by Hungarian method is proved, using two utility matrices, i.e. the Frobenius-norm matrix and the determinant matrix. Simulation results show that the proposed algorithm can achieve higher capacity than the existing algorithms, and it is globally optimal and easy to be implemented.展开更多
文摘Beamforming is a kind of signal processing technique which can improve system performance in the multiple-input multiple-output(MIMO)systems.In this paper,the problem of allocating subcarriers in MIMO-OFDMA wireless systems was analyzed,and a scheme to allocate subcarriers among all users based on beamforming was proposed to maximize the signal-to-noise ratio(SNR)at the receiver.Statistical properties of the channel matrix were studied,and some beneficial results were got.Statistical channel state information(CSI)was also taken into account to simulate more practical systems.Simulation results show that the proposed allocating scheme is effective,and it is robust to the influence of delayed CSI.
基金supported by the National Natural Science Foundation of China (Grant No.60572156)
文摘MIMO-OFDMA is a promising technique for future broadband wireless communication systems. In this paper, the problem of allocating subcarriers among different users to maximize the total capacity is addressed. The optimal solution can be obtained by Hungarian method is proved, using two utility matrices, i.e. the Frobenius-norm matrix and the determinant matrix. Simulation results show that the proposed algorithm can achieve higher capacity than the existing algorithms, and it is globally optimal and easy to be implemented.
