有限反馈多用户MIMO-OFDMA下行链路预编码

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Precoding for the multiuser MIMO-OFDMA downlink with limited feedback

LIU Yi;ZHANG Hai-lin

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi′an 710071， China)

Received:1900-01-01 Revised:1900-01-01 Online:2007-02-20 Published:2007-02-25

Abstract

Abstract: A precoding scheme for the MIMO-OFDMA downlink is discussed, which includes subcarrier assigning, power allocation and adaptive modulation. By using the beamforming codebook constructed according to the Grassmannian space packing, the optimal beamforming vector is determined at the receiver and its index is conveyed to the transmitter. Then power and bits are allocated to each subcarrier using ‘greedy algorithm’. The feedback data are greatly decreased compared with the existing schemes while maintaining a large capacity.

Key words: MIMO-OFDMA, multiuser, limited feedback, precoding

CLC Number:

TN929.5

LIU Yi;ZHANG Hai-lin. Precoding for the multiuser MIMO-OFDMA downlink with limited feedback
[J].J4, 2007, 34(1): 71-75.

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Precoding for the multiuser MIMO-OFDMA downlink with limited feedback

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