TY - GEN
T1 - Joint time-frequency beamforming for MIMO-OFDM systems
AU - Li, Shaohua
AU - Huang, Defeng
AU - Letaief, K. B.
AU - Zhou, Zucheng
PY - 2005
Y1 - 2005
N2 - Orthogonal frequency division multiplexing (OFDM) with multiple transmit and multiple receive antennas (MIMO) is one of the most promising technology in broadband wireless communications due to its capability in combating the multi-path fading channels. Frequency domain beamforming is a popular technology that can be used in MIMO-OFDM systems to achieve good performance. However, it induces considerable complexity due to the huge number of FFT (Fast Fourier Transform) blocks required. In contrast, time domain beamforming can be used to significantly reduce the complexity but with a significant performance loss especially when the number of distinct paths in the channel is large. In this paper, we propose a new beamforming technology for MIMO-OFDM systems, where the principle of time domain beamforming and the principle of frequency domain beamforming are simultaneously employed. Using the proposed scheme, we will show that complexity and performance can be effectively traded off. Furthermore, we propose an iterative algorithm to calculate both the frequency domain weighting coefficients and the time domain weighting coefficients. Simulation results show that good performance can be achieved with the iterative weighting coefficients calculation algorithm.
AB - Orthogonal frequency division multiplexing (OFDM) with multiple transmit and multiple receive antennas (MIMO) is one of the most promising technology in broadband wireless communications due to its capability in combating the multi-path fading channels. Frequency domain beamforming is a popular technology that can be used in MIMO-OFDM systems to achieve good performance. However, it induces considerable complexity due to the huge number of FFT (Fast Fourier Transform) blocks required. In contrast, time domain beamforming can be used to significantly reduce the complexity but with a significant performance loss especially when the number of distinct paths in the channel is large. In this paper, we propose a new beamforming technology for MIMO-OFDM systems, where the principle of time domain beamforming and the principle of frequency domain beamforming are simultaneously employed. Using the proposed scheme, we will show that complexity and performance can be effectively traded off. Furthermore, we propose an iterative algorithm to calculate both the frequency domain weighting coefficients and the time domain weighting coefficients. Simulation results show that good performance can be achieved with the iterative weighting coefficients calculation algorithm.
UR - https://openalex.org/W2104199678
UR - https://www.scopus.com/pages/publications/33846581505
U2 - 10.1109/GLOCOM.2005.1578506
DO - 10.1109/GLOCOM.2005.1578506
M3 - Conference Paper published in a book
SN - 0780394143
SN - 9780780394148
T3 - GLOBECOM - IEEE Global Telecommunications Conference
SP - 3927
EP - 3931
BT - GLOBECOM'05
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - GLOBECOM'05: IEEE Global Telecommunications Conference, 2005
Y2 - 28 November 2005 through 2 December 2005
ER -