Abstract
We consider regularized channel inversion (RI) precoding in the multiuser multiple input multiple output (Mu- MIMO) broadcast channels. To make the RI operate in quantized channel feedback condition, we analyze the quantization error variance and its effect on the signal to interference plus noise power ratio (SINR) of the user signals. The regularization parameter α is optimized to balance the additive noise, the multiuser interference and the interference due to the quantization error and to maximize SINR. Analysis and simulations show that regularization enhances the performance of zero forcing beam forming (ZFBF) over the whole signal to noise power ratio (SNR) range. This is contrasting to the perfect channel status information (CSI) case, where the enhancement is observed in the low SNR region.
Original language | English |
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Article number | 5351694 |
Pages (from-to) | 5785-5789 |
Number of pages | 5 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 8 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2009 Dec |
Keywords
- Broadcasting channels
- Quantized feedback
- Regularized channel inversion
- Sum-rate capacity
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics