Title :
Three-Stage Treatment of TX/RX IQ Imbalance and Channel with CFO for SC-FDE Systems
Author :
Changming Zhang ; Zhenyu Xiao ; Bo Gao ; Li Su ; Depeng Jin
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
Direct-conversion transceiver obtains increasing attentions due to its low power consumption, but it confronts with serious IQ imbalance. In this paper, a three-stage treatment of transmitter/receiver (TX/RX) IQ imbalance and channel, in the presence of carrier frequency offset (CFO), is proposed for single-carrier-frequency-domain-equalization (SC-FDE) systems. First, RX IQ imbalance and CFO are handled with a repetitive preamble. Second, joint responses of TX IQ imbalance and channel are estimated by designing another preamble via complementary Golay codes. Third, joint compensation of TX IQ imbalance and time-varying channel is conducted using the minimal-mean-square-error criterion. Simulations are presented to verify the proposed method, in terms of normalized mean square error for the estimation and bit error rate for the overall system.
Keywords :
Golay codes; channel coding; channel estimation; compensation; equalisers; error statistics; estimation theory; least mean squares methods; time-varying channels; CFO; SC-FDE system; TX-RX IQ imbalance; bit error rate; carrier frequency offset; channel estimation; compensation; complementary Golay code; direct-conversion transceiver; minimal-mean-square-error criterion; normalized mean square error term; power consumption; single-carrier-frequency-domain-equalization system; three-stage treatment; time-varying channel; transmitter-receiver IQ imbalance; Bit error rate; Channel estimation; Discrete cosine transforms; Estimation; Joints; OFDM; Receivers; CFO; IQ imbalance; MMSE; SC-FDE; complementary Golay codes; direct-conversion transceiver;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.123113.132375
