Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 61, Issue 3, Pages 1445-1451Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2012.2184807
Keywords
Limited feedback; multiple-input-multiple-output (MIMO) broadcast channels; multiuser MIMO (MU-MIMO); zero-forcing beamforming (ZFBF)
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Funding
- National Research Foundation of Korea [2011-0027536]
- Korea government (Ministry of Education, Science, and Technology)
- Samsung Advanced Institute of Technology
- National Research Foundation of Korea [2009-0085604] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this paper, an efficient channel feedback scheme for downlink multiuser multiple-input-multiple-output (MU-MIMO) systems is proposed. The objective of the new feedback design is to adaptively control the feedback rate of each user, depending on the individual channel status, while the overall sum feedback rate is kept the same. The proposed channel feedback scheme is composed of two stages: 1) the common channel feedback stage of all users and 2) the user-specific channel feedback stage of the selected users. We present a low-complexity algorithm to determine the individual feedback rates of users, which utilizes convex optimization, followed by iterative steepest descent direction searching. Numerical results show that zero-forcing beamforming (ZFBF), combined with the proposed channel feedback scheme, considerably outperforms ZFBF with conventional channel feedback schemes.
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