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To improve the performance of time-varying distributed multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, a subblock-wise channel estimation scheme based on discrete prolate spheroidal basis expansion model (DPS-BEM) is proposed. The time-varying channel is well captured by the DPS-BEM, exploiting the unknown channel slepian correlation. The time-variations...
Orthogonal frequency division multiplexing (OFDM) is a promising technique for fourth-generation (4G) broadband wireless communication systems. However, it suffers from intercarrier interference (ICI) due to its sensitivity to the frequency offset caused by Doppler frequency drift. In this paper, we investigate the self-cancellation techniques to mitigate ICI for OFDM systems and a novel ICI self-cancellation...
A novel least square (LS) estimation method for frequency-domain channel parameters is proposed for orthogonal frequency division multiplexing (OFDM) systems. It inserts character pilots with constant envelops in time domain to avoid influencing the peak-to-average power ratio (PAPR) of systems caused by the inserted pilots. Moreover, it improves the estimation accuracy significantly with much lower...
Channel estimation is indispensable when a coherent demodulation is adopted to achieve the 3 dB SNR gain in OFDM transmission systems. In this paper, a novel frequency domain OFDM channel estimator based on the nonmaximally decimated filterbanks and the corresponding pilots design optimization method is developed. Compared with the conventional LS and DFT-based MMSE methods, the proposed scheme does...
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