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In orthogonal frequency division multiplexing (OFDM) system, synchronization and channel estimation are two important issues under the wireless fading channel in broadband wireless communication. The timing and frequency offset will affect the accuracy of channel estimation. These issues are studied in this paper, and a frequency selective fading channel under the OFDM system model is set up. This...
By using a pilot sample from a selected time-slot in a time-domain orthogonal frequency division multiplexing (OFDM) block, we present a simple maximum-likelihood (ML) scheme for frequency tracking in OFDM systems over frequency-selective channels. The frequency offset estimator thus obtained is found to become unbiased and its mean square error (MSE) will approach the Cramer-Rao bound (CRB) as signal-to-noise...
In this paper the coefficient tracking synchronization algorithm is proposed for the compensation and the suitability of the fast channel fluctuation OFDM in the WAVE (wireless access in vehicular environments) system. The progress of standardization WAVE process, IEEE802.11p's physical layer is considered on the coexistence of fading and frequency offset of OFDM channel to find the system performance...
Orthogonal frequency division multiplexing (OFDM) is a transmission technique which is robust in multipath channels. It is though sensitive to frequency errors that may be caused by several factors such as frequency offset at the local oscillator, phase noise and mobility of the receiver. These errors may destroy orthogonality among subcarriers and introduce intercarrier interference (ICI) that may...
Cyclic delay diversity (CDD) is a simple transmit diversity technique for coded OFDM systems with multiple transmit antennas. It is applicable to existed wireless communication systems since it does not need modifications of the standard OFDM receiver. However, CDD causes serious degradation in the performance of post-FFT estimation, i.e., integer frequency offset (IFO). This paper suggests pilot...
Frame timing and carrier frequency offsets in orthogonal frequency division multiplexing (OFDM) may drastically degrade performance if not accurately compensated. In practice, these offsets are estimated by transmitting a training block at the beginning of each frame. By designing this training block to have a repetitive structure, various estimation methods have been proposed in the literature. These...
In this paper, a blind algorithm is proposed for channel and CFO estimation in zero-prefix OFDM systems. By exploiting the greatest common divisor structure of the received signal for two or more symbols, the algorithm yields joint estimates of channel parameters and carrier frequency offset. It provides error-free message recovery at moderate SNRs.
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