Referenced Items are not available for this document.
This letter considers the relay-assisted multiuser downlink transmission with limited feedback in a wireless cellular network. Taking into account the channel quantization errors, we propose two robust linear beamforming schemes at the relay station based on zero forcing (ZF) criterion and minimum mean square error (MMSE) criterion, respectively. It is noted that the channel direction information (CDI) feedback is sufficient for determining the beamforming vectors in our proposed schemes, which reduces the feedback load. Simulation results show that compared with the conventional ZF beamforming and MMSE beamforming in limited feedback systems, the proposed precoding schemes achieve an improvement in the average bit error rate (BER) performance of the system.
Published in:
Signal Processing Letters, IEEE
(Volume:17
,
Issue:
2
)
Date of Publication: Feb. 2010
- Page(s):
- 209 - 212
- ISSN :
- 1070-9908
- INSPEC Accession Number:
- 11118757
- Digital Object Identifier :
- 10.1109/LSP.2009.2036877
- Product Type:
- Journals & Magazines
- Date of Publication :
- 17 November 2009
- Date of Current Version :
- 18 December 2009
- Issue Date :
- Feb. 2010
- Sponsored by :
- IEEE Signal Processing Society
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