TY - JOUR
T1 - Decision-feedback closest lattice point search for UMTS HSPA system
AU - Shim, Byonghyo
AU - Abrishamkar, Farrokh
AU - Kang, Insung
N1 - Funding Information:
Manuscript received March 30, 2009; revised July 15, 2009. First published July 31, 2009; current version published September 02, 2009. This work was supported by a research grant from Qualcomm, Inc. and by KOSEF R01-2008-000-20292-0. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Tan F. Wong. B. Shim is with the School of Information and Communication, Korea University, Seoul 136-713, Korea (e-mail: bshim@korea.ac.kr). F. Abrishamkar and I. Kang are with Qualcomm, Inc., San Diego, CA 92121 USA (e-mail: farrokha@qualcomm.com; insungk@qualcomm.com). Color versions of one or more figures in this paper are available at http:// ieeexplore.ieee.org. Digital Object Identifier 10.1109/LSP.2009.2028949
PY - 2009
Y1 - 2009
N2 - This letter considers a low-complexity multiuser detection based on the closest lattice point search (CLPS) for high speed packet access (HSPA) system. Instead of attempting to solve the ML detection problem in the presence of intersymbol and inter-cell interference, we utilize interference cancelled chips obtained from a bidirectional decision feedback operation to detect symbols. As a result, the worst case complexity of the CLPS is bounded to a controllable level irrespective of multipath spans. From the simulation on single and multi cell downlink communications in HSPA systems, we show that the proposed method offers substantial performance gain over conventional RAKE and MMSE equalizer.
AB - This letter considers a low-complexity multiuser detection based on the closest lattice point search (CLPS) for high speed packet access (HSPA) system. Instead of attempting to solve the ML detection problem in the presence of intersymbol and inter-cell interference, we utilize interference cancelled chips obtained from a bidirectional decision feedback operation to detect symbols. As a result, the worst case complexity of the CLPS is bounded to a controllable level irrespective of multipath spans. From the simulation on single and multi cell downlink communications in HSPA systems, we show that the proposed method offers substantial performance gain over conventional RAKE and MMSE equalizer.
KW - Closest lattice point search
KW - High speed packet access
KW - Interference cancellation
KW - Multiuser detection
KW - Sphere decoding
UR - http://www.scopus.com/inward/record.url?scp=70349602213&partnerID=8YFLogxK
U2 - 10.1109/LSP.2009.2028949
DO - 10.1109/LSP.2009.2028949
M3 - Article
AN - SCOPUS:70349602213
SN - 1070-9908
VL - 16
SP - 1035
EP - 1038
JO - IEEE Signal Processing Letters
JF - IEEE Signal Processing Letters
IS - 12
ER -