Joint time-frequency beamforming for MIMO-OFDM systems

Shaohua Li, Defeng Huang, K. B. Letaief, Zucheng Zhou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


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.

Original languageEnglish
Title of host publicationGLOBECOM'05
Subtitle of host publicationIEEE Global Telecommunications Conference, 2005
Number of pages5
Publication statusPublished - 1 Dec 2005
EventGLOBECOM'05: IEEE Global Telecommunications Conference, 2005 - St. Louis, MO, United States
Duration: 28 Nov 20052 Dec 2005

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference


OtherGLOBECOM'05: IEEE Global Telecommunications Conference, 2005
CountryUnited States
CitySt. Louis, MO


ASJC Scopus subject areas

  • Engineering(all)

Cite this

Li, S., Huang, D., Letaief, K. B., & Zhou, Z. (2005). Joint time-frequency beamforming for MIMO-OFDM systems. In GLOBECOM'05: IEEE Global Telecommunications Conference, 2005 (pp. 3927-3931). [1578506] (GLOBECOM - IEEE Global Telecommunications Conference; Vol. 6).