Vector Perturbation and Permutation for Correlated MIMO Channel with Limited Feedback System
碩士 === 國立清華大學 === 通訊工程研究所 === 97 === In this thesis, we have studied the vector perturbation precoding techniques for MIMO communications [1]. The major contributions of this thesis are in three folds. First, we propose dual modes vector perturbation transmitter based multiuser MIMO systems. The dua...
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| Format: | Others |
| Language: | en_US |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/10258519261400166724 |
| Summary: | 碩士 === 國立清華大學 === 通訊工程研究所 === 97 === In this thesis, we have studied the vector perturbation precoding techniques for MIMO
communications [1]. The major contributions of this thesis are in three folds. First, we
propose dual modes vector perturbation transmitter based multiuser MIMO systems.
The dual modes vector perturbaion transmitter can reduce the number of sphere encoder
[1] calls. Second, we propose the vector permutation system for point-to-point MIMO
systems and combine the vector permutation with vector perturbation for multi-user
MIMO systems with multiple antenna receiver to further reduce the energy of tranmitted
signal of vector perturbation system. A searching algorithm of optimal perturbation
vector and permutation vector simultaneously by tree search is also proposed. Third,
the proposed vector permutation and perturbation is applied to limited feedback system
in correlated channel. The proposed vector permutation and perturbation system can
combat the degradation of channel correlation. The predefining lookup table is proposed
for searching the optimal perturbation and permutation vectors. Finally, we verify the
performance of three proposed systems by means of numerical simulations.
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