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OFDM has recently been applied widely in wireless communication system due its high data rate transmission capability with high bandwidth efficiency. The channel estimation is playing key role for wireless communication system. In this paper, we present the improved scheme of LS based channel estimation technique using block type pilot arrangement for varying different values of channel impulse responses...
It is well known that Carrier frequency offset (CFO) is a performance limiting factor in orthogonal frequency division multiplexing (OFDM) systems. In this paper, we present maximum-likelihood estimators (MLE) for the CFO in OFDM systems in static and time-varying channels and evaluate the Cramer-Rao lower bounds (CRLB) for both cases. In addition, we examine the effect of power amplifiers' (PA) nonlinearity,...
In this paper, enhanced DFT-based channel estimation for OFDM system is proposed. Conventional DFT-based channel estimations improve the performance by suppressing time-domain noise. However, the disadvantage is that it cannot distinguish each path from the aliasing components of CIR when the periodic replicas of the estimated CIR are overlapped each other in very large delay spread channels. If any...
This paper is concerned with a simple in-phase and quadrature-phase (IQ) imbalance compensation scheme using a single pilot symbol in orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can estimate the IQ imbalance factors with pilot subcarriers of an OFDM symbol while existing method requires more OFDM symbols. Also, the proposed method is computationally efficient and...
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