DocumentCode :
1522303
Title :
A Time-Domain Joint Estimation Algorithm for CFO and I/Q Imbalance in Wideband Direct-Conversion Receivers
Author :
Pan, Yen-Chang ; Phoong, See-May
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Volume :
11
Issue :
7
fYear :
2012
fDate :
7/1/2012 12:00:00 AM
Firstpage :
2353
Lastpage :
2361
Abstract :
Carrier frequency offset (CFO) and in-phase and quadrature-phase (I/Q) imbalance are two of the common front-end impairments in low-cost communication devices. It is known that CFO can cause significant performance degradation in multi-carrier modulation (MCM) systems. Also, the existence of the I/Q imbalance usually reduces the accuracy of CFO estimation. In this paper, we propose a new data-aided scheme for the joint estimation of CFO and I/Q imbalance using simple matrix formulation. The proposed algorithms utilize only the periodicity of the generalized periodic pilot (GPP). They do not need to know the channel impulse response and the exact values of the training sequence. Moreover, our method has a low complexity and its performance compares favorably with the existing methods.
Keywords :
broadband networks; modulation; radio receivers; wireless channels; CFO estimation; GPP; I/Q imbalance; MCM system; carrier frequency offset; channel impulse response; data-aided scheme; front-end impairment; generalized periodic pilot; in-phase imbalance; low-cost communication device; matrix formulation; multicarrier modulation; performance degradation; quadrature-phase imbalance; time-domain joint estimation algorithm; training sequence; wideband direct-conversion receiver; Complexity theory; Estimation; Joints; Noise; Receivers; Robustness; Training; Multi-carrier modulation; carrier frequency offset (CFO); direct-conversion receivers; frequency-dependent I/Q imbalance;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2012.051412.100882
Filename :
6204014
Link To Document :
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