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Orthogonal frequency division multiplexing (OFDM) is an important technology for high-speed data transmission by virtue of its high spectral efficiency and robustness to multipath fading. These advantages can be achieved only with good synchronization both in time and frequency domain. For time synchronization, the cross-correlation based scheme can be combined with autocorrelation one to mitigate...
This paper proposes a low complexity peak-to-average power ratio estimation scheme for OFDM systems. The new scheme introduces a non-equal-distance estimation based on triangle interpolation, which approximates higher oversampling samples by lower oversampling samples. Simulation shows the new scheme can achieve a good approximating to signal distribution of the real over-sampled OFDM signal. Furthermore,...
Signal to clipping noise ratio (SCR) and active-set methods are two existing peak to average power ratio (PAPR) reduction methods based on tone reservation. In this paper, we compare the PAPR reduction performance of these two methods, and the computational complexity is analyzed. The simulation results show that active-set method requires less computational complexity than that of SCR method while...
This paper presents an improved carrier frequency offset (CFO) estimator using cyclic prefix (CP) for orthogonal frequency division multiplexing (OFDM) systems. The basic principle is to detect the sign of the CFO value firstly, which will facilitate the extension of the estimation range of the estimator. It is shown by simulation results that the proposed estimator can achieve a double CFO estimation...
Orthogonal frequency division multiplexing (OFDM) is a promising transmission technique for future wireless communication systems. However, OFDM is very sensitive to carrier frequency offset (CFO). And for an OFDM system with CFO estimation and compensation, the residual CFO will always degrade the system performance. To alleviate this problem, in this paper, a new technique is proposed to estimate...
Partial transmit sequence (PTS) is a promising technique for reducing the high peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. In PTS, multiple candidate signals are generated and the optimal signal with the lowest PAPR is selected for transmission. One drawback of PTS is that parts of the candidate signals are strongly correlated so as to degrade the...
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