User Selection Method Adopting Cross-Entropy Method for a Downlink Multiuser MIMO System
- Title
- User Selection Method Adopting Cross-Entropy Method for a Downlink Multiuser MIMO System
- Author
- 최승원
- Keywords
- MU-MIMO; User selection; Cross entropy method; Sum-rate; Complexity
- Issue Date
- 2014-01
- Publisher
- Springer
- Citation
- WIRELESS PERSONAL COMMUNICATIONS; JAN 2014, 74, 2, p789-p802
- Abstract
- This letter presents a novel method of user selection in a downlink multi-user multiple input multiple output (MU-MIMO) system employing the precoding procedures of zero forcing or block diagonalization (BD). The proposed technique utilizes the cross-entropy method (CEM) in order to maintain a performance level comparable to that of the full search (FS) method with reasonable complexity. With the CEM, the proposed system can select multiple users at once instead of selecting a single user at each step. From various computer simulations, it has been verified that the proposed method exhibits nearly 98 % of the sum-rate compared to the FS method, which implies that the proposed method far outperforms conventional methods such as semi-orthogonal user selection (SUS) or the capacity-based suboptimal user selection (CBSUS) algorithm. Compared to CBSUS, the proposed technique enhances the sum-rate by approximately 1.1 bps/Hz with about half the complexity when each user is equipped with two receiving antennas. In the case where each user is equipped with a single antenna, the proposed method outperforms the method of SUS by about 0.3 bps/Hz, at the expense of a complexity increase of times.
- URI
- http://link.springer.com/article/10.1007%2Fs11277-013-1321-7http://hdl.handle.net/20.500.11754/46730
- ISSN
- 0929-6212
- DOI
- 10.1007/s11277-013-1321-7
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML