Title:
APPARATUS AND METHOD FOR I/Q OFFSET CANCELLATION IN SC-FDMA SYSTEM
Document Type and Number:
WIPO Patent Application WO/2012/030028
Kind Code:
A1
Abstract:
The present invention relates to an apparatus and a method for eliminating I/Q offset in a receiver of a SC-FDMA system which improves performance of the system by accurate measurement and cancellation of I/Q offset in a receiver of a SC-FDMA system operating in a 3GPP LTE uplink. An apparatus for eliminating I/Q offset in a receiver of the SC-FDMA system constituting the receiver of the SC-FDMA system includes: a linear interpolation channel estimation unit for estimating channel using demodulation reference symbol (DMRS) that is a training sequence (X) corresponding to the discrete Fourier transformed signal (Y) that has passed through frame sync acquisition, frequency compensation and cyclic prefix elimination; a signal regeneration/cancellation unit for calculating I/Q offset (D = Y - Y') by subtracting the discrete Fourier transformed signal (Y) from the ideal discrete Fourier transformed signal (Y' = H'X) generated by using channel coefficient (H'), that is an output of the linear interpolation channel estimation unit, and the DMRS that is the training sequence (X); and an I/Q offset measurement/cancellation unit for generating VQ offset-free signal (YNoDC = Y - D') by subtracting I/Q offset (D') having corrected phase and power of the VQ offset (D = Y - Y') from the discrete Fourier transformed signal (Y).
Inventors:
JOUNG JINSOUP (KR)
HA KYEONGMIN (KR)
JI SEUNGHWAN (KR)
LIM YONGHOON (KR)
JANG BYUNGKWAN (KR)
HA KYEONGMIN (KR)
JI SEUNGHWAN (KR)
LIM YONGHOON (KR)
JANG BYUNGKWAN (KR)
Application Number:
PCT/KR2010/009578
Publication Date:
March 08, 2012
Filing Date:
December 30, 2010
Export Citation:
Assignee:
INNOWIRELESS CO LTD (KR)
JOUNG JINSOUP (KR)
HA KYEONGMIN (KR)
JI SEUNGHWAN (KR)
LIM YONGHOON (KR)
JANG BYUNGKWAN (KR)
JOUNG JINSOUP (KR)
HA KYEONGMIN (KR)
JI SEUNGHWAN (KR)
LIM YONGHOON (KR)
JANG BYUNGKWAN (KR)
International Classes:
H04J1/12
Foreign References:
| US20100080114A1 | 2010-04-01 | |||
| KR20080050221A | 2008-06-05 |
Other References:
RUMNEY M.: "3GPP LTE: Introducing Single-Carrier FDMA", AGILENT TECHNOLOGIES INC. JOURNAL, 1 January 2008 (2008-01-01), pages 1 - 10, XP003031817
SANG-BURM RYU ET AL.: "ICI and Compensation Algorithm against Frequency Offset and Phase Noise in SC-FDMA System with Comb Type Pilot", JOURNAL OF KIEES, vol. 21, no. 4, April 2010 (2010-04-01), XP055127149
SANG-BURM RYU ET AL.: "ICI and Compensation Algorithm against Frequency Offset and Phase Noise in SC-FDMA System with Comb Type Pilot", JOURNAL OF KIEES, vol. 21, no. 4, April 2010 (2010-04-01), XP055127149
Attorney, Agent or Firm:
DARAE IP FIRM (647-9 Yeoksam-dong, Gangnam-gu, Seoul 135-080, KR)
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Claims: