Blind carrier frequency offset estimation in OFDM systems with I/Q imbalance
نویسندگان
چکیده
In this paper, estimation of carrier frequency offset (CFO) in orthogonal frequency division multiplexing (OFDM) systems with I/Q imbalance is studied. By exploiting the mirror spectrum induced by I/Q imbalance, we proposed a novel algorithm for blind CFO estimation without training sequences. Simulation results show that the proposed algorithm outperforms the existing one, which is well accepted as a guideline of blind CFO estimation algorithms in OFDM systems. & 2009 Elsevier B.V. All rights reserved.
منابع مشابه
Blind estimation of carrier frequency offset, I/Q imbalance and DC offset for OFDM systems
Sensitivity to carrier frequency offset (CFO) is one of the biggest drawbacks of orthogonal frequency division multiplexing (OFDM) system. A lot of CFO estimation algorithms had been studied for compensation of CFO in OFDM system. However, with the adoption of direct-conversion architecture (DCA), which introduces additional impairments such as dc offset (DCO) and in-phase/quadrature (I/Q) imba...
متن کاملCarrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems
Two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance are considered for orthogonal frequency division multiplexing (OFDM) communication systems. A preamble-assisted carrier frequency estimator is proposed along with an I/Q imbalance compensation scheme. The new frequency estimator reveals the relationship between the ...
متن کاملOFDM Channel Estimation in the Presence of Receiver I/Q Imbalance and CFO Using Pilot Symbols
In this paper, we study the channel estimation in the presence of the receiver in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO) for orthogonal frequency division multiplexing (OFDM) systems using pilot symbols. The concept of channel residual energy (CRE) [9] is used to solve the joint estimation problem. By minimizing the CRE, we can jointly estimate the receive...
متن کاملEfficient Joint Estimation and Compensation of CFO, Tx/Rx Frequency-Selective I/Q Imbalance, and the MIMO Radio Channel in OFDM Systems
MIMO OFDM is a very promising technique for future wireless communication systems. By applying direct conversion architecture, low-cost, low-power, small size and flexible implementation of MIMO OFDM systems can be realized. However, the performance of direct conversion architecture based MIMO OFDM systems can be seriously affected by RF impairments incl. Carrier Frequency Offset (CFO) and I/Qi...
متن کاملPreamble design for joint estimation of CFO and I/Q imbalance for direct conversion OFDM system
This paper proposes a preamble structure for joint estimation of carrier frequency offset (CFO) and I/Q imbalance. Because existing methods cannot guarantee correct solutions within all range of CFOs, we derive two constraints of phase rotations applied to repetition patterns. By using the preamble based on the presented constraints, CFO is optimally estimated, and I/Q imbalance estimation is p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Signal Processing
دوره 89 شماره
صفحات -
تاریخ انتشار 2009