Improved opportunistic beamforming in Ricean channels
- Title
- Improved opportunistic beamforming in Ricean channels
- Author
- 김동우
- Keywords
- Cramer-Rao lower bound (CRLB); direction of arrival (DOA); multiuser diversity; opportunistic beamforming
- Issue Date
- 2006-12
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE TRANSACTIONS ON COMMUNICATIONS, v. 54, No. 12, Page. 2199-2211
- Abstract
- In order to improve the performance of opportunistic beamforming in Ricean channels, we propose an improved opportunistic beamforming scheme which forms beams intelligently to the users. First, a new concept of the generalized Ricean distribution is introduced. On the basis of this theory, we propose a maximum-likelihood (ML) estimator of the directions of arrival of the users, and we derive the Cramer-Rao lower bound to evaluate the performance of the ML estimator. Furthermore, the generalized Ricean K-factors are estimated by a moment-based method. With the same pilot overhead in the downlink and with the same feedback overhead in the uplink, the improved scheme considerably outperforms conventional opportunistic beamforming.
- URI
- https://ieeexplore.ieee.org/document/4026724https://repository.hanyang.ac.kr/handle/20.500.11754/108984
- ISSN
- 0090-6778; 1558-0857
- DOI
- 10.1109/TCOMM.2006.884851
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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