Statistical Digital Signal Processing and Modeling
Statistical Digital Signal Processing and Modeling
OFDM for Wireless Multimedia Communications
OFDM for Wireless Multimedia Communications
Multi-Carrier and Spread Spectrum Systems
Multi-Carrier and Spread Spectrum Systems
EURASIP Journal on Wireless Communications and Networking - 3GPP LTE and LTE Advanced
Subspace methods for the blind identification of multichannel FIRfilters
IEEE Transactions on Signal Processing
Subspace-based blind and semi-blind channel estimation for OFDMsystems
IEEE Transactions on Signal Processing
Transmitter induced cyclostationarity for blind channelequalization
IEEE Transactions on Signal Processing
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Discrete Fourier Transform- (DFT-) precoded Orthogonal Frequency Division Multiple Access (OFDMA) with interleaved subcarrier allocation per user is considered which is denoted as Interleaved Frequency Division Multiple Access (IFDMA). For IFDMA, the received signal exhibits a cyclostationarity with the parameter Q which defines the number of allocated subcarriers per user. In previous works, we have shown that this cyclostationarity can be exploited for the application of subspace-based semiblind channel estimation to IFDMA. Nevertheless, the formerly proposed algorithm is restricted to channels with small delay spreads, meaning that the number of channel delay taps needs to be smaller than Q. In this paper, we introduce a new semiblind subspace-based channel estimation algorithm which identifies a subspace of the received signal that is spanned by the Q elements of the so-called cyclic channel impulse response. By doing so, the number of elements to be estimated is reduced and the proposed algorithm is able to cope with channels with large delay spreads.