Blind channel estimation for multiple antenna OFDM system subject to unknown carrier frequency offset

Abstract

The problem of channel estimation for multiple antenna orthogonal frequency division multiplexing (OFDM) systems subject to unknown carrier frequency offset (CFO) is addressed. Multiple signal classification (MUSIC)-like algorithm, which generally has been used for direction estimation or frequency estimation, is used for channel estimation in multiple antenna OFDM systems. A reduced dimensional (RD)-MUSIC based algorithm for channel estimation is proposed in multiple antenna OFDM systems with unknown CFO. The Cramér-Rao bound (CRB) of channel estimation in multiple antenna OFDM systems with unknown CFO is derived. The proposed algorithm has a superior performance of channel estimation compared with the Capon method and the least squares method.

Semi‐blind demodulation algorithm for short burst FM‐MFSK based on STFT

“…The definition of the STFT of the discrete signal sampling sequence s(m) [13,14], as shown in Formula ( 5),…”

“…The time-frequency ridge can be used to extract the peak frequency of each discrete point in the signal time-frequency distribution sequence S (k, f) [14] and the calculation formula is shown in Formula (6).…”