Towards the Performance of ML and the Complexity of MMSE: A Hybrid Approach for Multiuser Detection
- Title
- Towards the Performance of ML and the Complexity of MMSE: A Hybrid Approach for Multiuser Detection
- Author
- 최준원
- Keywords
- Closest lattice point search; sphere decoding; multiuser detection; Babai point; noncausal path metric
- Issue Date
- 2012-07
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
- Citation
- IEEE Transactions on Wireless Communications , 11권, 7호, 2508p ~ 2519p
- Abstract
- In this paper, we consider a low-complexity multiuser detection for downlink of high speed packet access (HSPA) of universal mobile telecommunications system (UMTS). Instead of attempting to perform maximum likelihood (ML) detection of all users in multiple cells, which is impractical for battery powered mobile receiver, we utilize interference cancelled chips obtained from iterative linear minimum mean square error (LMMSE) estimation to perform a near ML detection in a reduced dimensional system. As a result, the worst case complexity of the detection process, achieved by the closest lattice point search (CLPS), is bounded to a controllable level irrespective of multipath spans. Furthermore, by exploiting the LMMSE estimate in tightening the hypersphere condition of the CLPS algorithm so called sphere decoding, we achieve significant improvement in search complexity. From simulations on realistic downlink communication scenario in HSPA systems, we show that the proposed method offers substantial performance gain over conventional receiver algorithms with reasonable complexity.
- URI
- http://ieeexplore.ieee.org/document/6204012/http://hdl.handle.net/20.500.11754/38015
- ISSN
- 1536-1276
- DOI
- 10.1109/TWC.2012.051512.111220
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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