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Recently, a new orthogonal frequency division multiplexing (OFDM) scheme called time-frequency training OFDM (TFT-OFDM) has been proposed. Compared to the conventional cyclic prefix OFDM (CP-OFDM) or time-domain synchronous OFDM (TDS-OFDM) which only relies on either frequency-domain pilots or time-domain pseudo noise (PN) sequence for channel estimation, the proposed TFT-OFDM uses PN sequence to...
Recently, compressive sensing (CS) algorithms have been adopted to improve the accuracy of channel estimation for wide-band wireless communication systems. Since the wireless channel is usually time and frequency doubly selective fading, the performance of CS based channel estimation is limited by the estimation accuracy of the channel's sparsity level. In this paper, an adaptive subspace pursuit...
Time-varying channel always plays great obstacle to OFDM (orthogonal frequency domain modulation) as it introduces intercarrier interference (ICI). In terrestrial digital television broadcasting systems, residual Doppler shift may exist and deteriorate the orthogonality of subcarrier signal, especially during high-speed transportation such as high-speed railways. This paper proposed a jointly Doppler...
Recently, compressive sensing (CS) methods have been considered to improve the accuracy of channel estimation. Since the accurate estimation of the channel relies on the size of the observations, the fixed size of the observations is usually the trade-off between the channel estimation accuracy and the length of the channel delay to handle. In this paper, an adaptive compressive sensing (A-CS) algorithm...
Time domain synchronous OFDM (TDS-OFDM) can achieve a higher spectrum efficiency than standard cyclic prefix OFDM (CP-OFDM). Currently, it can support constellations up to 64QAM, but cannot support higher-order constellations like 256QAM due to the residual mutual interferences between the pseudorandom noise (PN) guard interval and the OFDM data block. To solve this problem, we break the traditional...
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