|
For Full-Text PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
|
Novel Downlink Beamforming Method Using Selective STBC with Common Eigenvectors for MIMO-OFDM Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Koichi TSUNEKAWA
Publication
IEICE TRANSACTIONS on Communications
Vol.E89-B
No.8
pp.2170-2179 Publication Date: 2006/08/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.8.2170 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: MIMO, eigenvector, OFDM, achievable spectrum efficiency, STBC, beamforming, maximum Doppler frequency, feedback overhead,
Full Text: PDF(1.4MB)>>
Summary:
To achieve a very high data rate within a limited frequency band in orthogonal frequency division multiplexing (OFDM) systems, multi-input multi-output (MIMO) techniques are very promising. Moreover, if a transmitter has the channel state information (CSI), the achievable spectrum efficiency can be maximized using the eigenbeam-space division multiplexing (E-SDM). However, this scheme demands accurate channel estimation. Therefore, in a closed-loop transmission scheme, an increase in the amount of feedback is absolutely necessary for the E-SDM. This paper describes a downlink beamforming method that significantly reduces the amount of feedback needed by using the common transmission weight vectors in all sub-carriers, compared to the amount required for E-SDM. The proposed method also applies transmission diversity to compensate for the quality. The effectiveness of the proposed method was confirmed using computer simulations in both Ricean and Rayleigh fading environments.
|
|
|