OFDM Channel Estimation in the Presence of Receiver I/Q Imbalance and CFO Using Pilot Symbols
نویسندگان
چکیده
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 receiver I/Q, CFO and channel response using the pilot symbols in one OFDM block. Simulation results show that the proposed method can provide good performance and also works well when applied to the terrestrial digital video broadcasting (DVB-T) systems. key words: OFDM, channel estimation, I/Q imbalance, CFO.
منابع مشابه
Channel Estimation and CFO Compensation in OFDM System Using Adaptive Filters in Wavelet Transform Domain
Abstarct In this paper, combination of channel, receiver frequency-dependent IQ imbalance and carrier frequency offset estimation under short cyclic prefix (CP) length are considered in OFDM system. An adaptive algorithm based on the set-membership filtering (SMF) algorithm is used to compensate for these impairments. In short CP length, per-tone equalization (PTEQ) structure is used to avoid i...
متن کاملA Thesis Submitted to the Faculty of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science Department of Electrical and Computer Engineering Saskatoon, Saskatchewan
Orthogonal Frequency Division Multiplexing (OFDM) plays an important role in the implementation of high data rate communication. In this thesis, the problems of data detection and channel and carrier frequency offset estimation in OFDM systems are studied. Multi-symbol non-coherent data detection is studied which performs data detection by processing multiple symbols without the knowledge of th...
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 کاملConcatenated Precoded OFDM for Residual CFO Effect Mitigation
Orthogonal frequency-division multiplexing (OFDM) is a popular transmission technique in wireless communications [1]-[3], primarily because it enables ef cient implementation by discrete Fourier transform (DFT) and easily avoids intersymbol interference by inserting suf ciently long guard intervals. However, spectrally overlapping data-modulated subcarriers make OFDM systems sensitive to carrie...
متن کاملEffects and Estimation Techniques of Symbol Time Offset and Carrier Frequency Offset in OFDM System: Simulation and Analysis
Orthogonal frequency division multiplexing system is multichannel system that provides high rate and high quality wireless communication services, but system performance is degraded by two factors, one is the symbol timing offset (STO) and other is the carrier frequency offset (CFO) caused by Doppler frequency shift. Several approaches have been proposed to estimate time and frequency offset. M...
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:
- IEICE Transactions
دوره 95-B شماره
صفحات -
تاریخ انتشار 2012