Abstract
Orthogonal frequency division multiplexing (OFDM) systems with direct-conversion architecture suffer from both carrier frequency offset (CFO) and dc offset (DCO). In this paper, we study CFO estimation problem for OFDM systems with time-varying DCO (TV-DCO) caused by gain mode switch of low noise amplifier (LNA). Based on linear approximation of TV-DCO, a blind algorithm is proposed for CFO estimation by means of DCO compensation and power leakage minimization. Performance of the proposed algorithm is demonstrated by simulations.
Highlights
Orthogonal frequency division multiplexing (OFDM) [1] is a promising technology for wireless communications to achieve efficient spectrum utilization, robustness to multi-path fading and easy implementation based on fast Fourier transform (FFT) and inverse FFT (IFFT), and has been widely adopted by emerging wireless applications such as digital audio broadcasting (DAB) [2], digital video broadcasting (DVB) [3], wireless local area network (WLAN) [4] and 3GPP long term evolution (LTE) [5] etc
Performance of LVD-eigen-decomposition based estimator (EDE) is demonstrated by simulations in comparison with established algorithms including the maximum likelihood Carrier frequency offset (CFO) estimation algorithm for OFDM systems with no dc offset (DCO) [7], with static DCO
OFDM systems with direct conversion receiver (DCR) suffer from both CFO and DCO
Summary
Orthogonal frequency division multiplexing (OFDM) [1] is a promising technology for wireless communications to achieve efficient spectrum utilization, robustness to multi-path fading and easy implementation based on fast Fourier transform (FFT) and inverse FFT (IFFT), and has been widely adopted by emerging wireless applications such as digital audio broadcasting (DAB) [2], digital video broadcasting (DVB) [3], wireless local area network (WLAN) [4] and 3GPP long term evolution (LTE) [5] etc.Despite of the attractive advantages, OFDM is vulnerable to various disturbances in practice. CFO estimation for OFDM systems had been excessively studied and various algorithms had been proposed in literatures such as [6,7,8]. In OFDM systems, DCO degrades demodulation performance and violates CFO estimation [14,15,16,17,18,19].
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