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This paper presents a blind method for joint carrier offset and code timing estimation in direct-sequence code-division multiple-access systems. The proposed method is arrived at by exploiting the subspace structure of the observed signal along with analytical tools of polynomial matrices. It yields an algebraic solution which avoids a multidimensional(More)
—In this paper, we present a blind code-timing esti-mator for asynchronous code-division multiple-access (CDMA) systems that use bandlimited chip waveforms. The proposed esti-mator first converts the received signal to the frequency domain, followed by a frequency deconvolution to remove the convolving chip waveform, and then calculates the code-timing(More)
—Block transmission techniques, including single-carrier (SC) and multicarrier (MC) communication techniques, have received much research interest recently for their better ability to handle the intersymbol interference problem than continuous transmission. Numerous detection schemes for SC and MC communication systems have been proposed. While these(More)
—Block transmission has recently been considered as an alternative to the conventional continuous transmission technique. In particular, block transmission techniques with zero padding (ZP) and cyclic prefix (CP) are becoming attractive procedures for their ability to eliminate both intersymbol interference (ISI) and interblock interference (IBI). In this(More)
This paper presents a blind joint channel and interference suppression for orthogonal frequency-division multiplexing (OFDM) systems. Our approach uses a generalized multi-channel minimum variance principle to design an equalizing filterbank that preserves the desired signal components and suppresses the overall interference. Channel estimate is then(More)
—In this paper, we present a group of subspace code-timing estimation algorithms for asynchronous code-division multiple-access (CDMA) systems with bandlimited chip waveforms. The proposed schemes are frequency-domain based techniques that exploit a unique structure of the received signal in the frequency domain. They can be implemented either blindly or in(More)
We consider joint adaptive transmit(TX) and receive (RX) beamforming for interference mitigation in array sensing systems. Unlike conventional designs, which only employ adaptive processing for the RX beamforming, we propose a fully adaptive approach that jointly selects the transmit correlation matrix and RX beamformer by maximizing the(More)
In this paper, we develop robust estimation and detection schemes that explicitly account for channel and covariance matrix estimation errors by optimizing the worst-case performance over properly selected bounded uncertainty sets. We show that it is beneficial to refine the channel and covariance matrix estimates over properly chosen bounded uncertainty(More)
Block transmission techniques have received much research interest recently for their ability to eliminate the intersymbol interference problem associated with continuous transmission. Numerous detection schemes for single carrier systems have been proposed. While these schemes may be derived from different principles, they usually rely on some prior(More)