On the performance of semi-orthogonal user selection with limited feedback

Wei Ni*, Zhuo Chen, Hajime Suzuki, Iain B. Collings

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The sum rates of MIMO broadcast channels degrade because of channel quantization errors (CQE), when semi-orthogonal user selection and zero-forcing beamforming (SUS-ZFBF) are used. To study this degradation, impractically many users have been assumed in the state-of-the-art. We derive two new bounds (i.e., upper and lower) to quantify the degradation for a practical number of users (i.e., K ≤ 100). Validated by simulations, the new bounds show that the degradation is marginal (<3%) from using non-optimal quantization methods. Our bounds also reveal that, for a given overall overhead, increasing quantization bits and reducing users per SUS-ZFBF process is able to substantially improve the sum rate.

Original languageEnglish
Article number6065239
Pages (from-to)1359-1361
Number of pages3
JournalIEEE Communications Letters
Issue number12
Publication statusPublished - Dec 2011
Externally publishedYes


  • limited feedback
  • semi-orthogonal user selection (SUS)
  • zero-forcing beamforming (ZFBF)


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