Estimation and Compensation of Carrier Frequency Offset (cfo) and Channel Distortion for Mimo Ofdm Systems
نویسندگان
چکیده
In this paper, proposed a joint estimation of Carrier Frequency Offset (CFO) and Channel Distortion for Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system using training sequences. Carrier Frequency Offset (CFO) acquisition algorithm and Carrier Frequency Offset (CFO) Tracking algorithm are proposed to improve the estimation accuracy of MIMO OFDM system. The proposed estimation method requires at least one OFDM training block for estimation and training symbols should be random. If the OFDM training block consists of two repeated sequences, a low complexity two step approach used to solve the joint estimation problem. Simulation results show that the Mean Squared Error (MSE) of Carrier Frequency Offset (CFO) and Channel Distortion in proposed methods. Keywords— Carrier-frequency offset (CFO), channel estimation, multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM).
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 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 کاملCarrier Frequency Offset Estimation for Orthogonal Frequency Division Multiplexing Systems
Carrier Frequency Offset Estimation for Orthogonal FrequencyDivision Multiplexing Systems Xiang Nian Zeng, Ph.D. Concordia University, 2008 Orthogonal frequency division multiplexing (OFDM) is an attractive modulation scheme used in wideband communications because it essentially transforms the frequency selective channel into a flat fading channel. Furthermore, the combination of multiple-input...
متن کاملPreamble design for estimation and compensation of channel distortion parameters in OFDM systems
In this paper, preamble design for estimation and compensation of channel distortion parameters (or channel impairments) in orthogonal frequency-division multiplexing (OFDM) transmission over peak-limited channels is studied. Specifically, the designed preamble considers the estimation of frequency selective channels, carrier frequency offset (CFO), in-phase/quadraturephase (I/Q) imbalance toge...
متن کاملCarrier Frequency Offset Estimation For MIMO-OFDM Beamforming Systems
In wireless communications systems, Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) are used to improve spectral efficiency and spatial diversity. Beamforming is used to improve bandwidth utilization. It increases the network range in wireless systems. The main challenge of OFDM system is Carrier frequency offset (CFO). The project focuses on CFO esti...
متن کامل