MIMO blind second-order equalization method and conjugate cyclostationarity

Chevreuil, Antoine; Loubaton, Philippe

doi:10.1109/78.740146

Cited by 65 publications

(23 citation statements)

References 21 publications

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“…By direct substitution, it follows that (8) The subspace approach that we borrow from [8] and [10] relies on (8). We collect all the cyclic spectra (6) corresponding to all nonzero cycles in the vector (9) Due to (6), in (9) can be factorized as (10) where is a vector given by (11) Because the condition is assumed, is the irreducible part of . Taking into account (8), we thus have (12) Suppose that , where stands for an upper bound (or estimate) of the unknown channel order .…”

Section: Blind Channel Identificationmentioning

confidence: 99%

“…The present paper assumes a different framework: a single-user channel with both convolutive and residual carrier effects and no spatial diversity condition but one that adopts a periodic precoder at the transmitter. Extension of the present single-user TIC approach to a multiuser scenario with both convolutive and residual carrier effects is possible when multiple users can be separated based on their distinct cyclic frequencies [9]. The proposed FO estimation setup can be viewed as an extension to frequency-selective channels of the FO estimation approach proposed for flat-fading channels in [18].…”

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confidence: 99%

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Blind channel and carrier frequency offset estimation using periodic modulation precoders

Serpedin

Chevreuil²,

Giannakis

et al. 2000

IEEE Trans. Signal Process.

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Abstract-Recent results have shown that blind channel estimators, which are resilient to the location of channel zeros, color of additive stationary noise, and channel order overestimation errors, can be developed for communication systems equipped with transmitter-induced cyclostationarity precoders. The present paper extends these blind estimation approaches to the more general problem of estimating the unknown intersymbol interference (ISI) and carrier frequency offset/Doppler effects using such precoders. An all-digital open-loop carrier frequency offset estimator is developed, and its asymptotic (large sample) performance is analyzed and compared to the Cramér-Rao bound (CRB). A subspace-based channel identification approach is proposed for estimating, in closed-form, the unknown channel, regardless of the channel spectral nulls. It is shown that compensating for the carrier frequency offset introduces no penalty in the asymptotic performance of the subspace channel estimator. Simulations are presented to corroborate the performance of the proposed algorithms.

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Section: Blind Channel Identificationmentioning

confidence: 99%

mentioning

confidence: 99%

Blind channel and carrier frequency offset estimation using periodic modulation precoders

Serpedin

Chevreuil²,

Giannakis

et al. 2000

IEEE Trans. Signal Process.

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“…Several modulation approaches have been proposed in the literature. Stochastic techniques such as "transmitter induced cyclostationarity," initially derived for single user blind equalization [14]- [16] have recently been extended to multiuser convolutive channels [17] and orthogonal frequency-division multiplexing (OFDM) [18]. A deterministic version of such a technique, using phase modulation codes, was proposed for source separation in MANETs [19] (this paper relates to several ideas proposed in [1] and also offers a throughput analysis which, therefore, we omit here).…”

Section: Introductionmentioning

confidence: 99%

Synchronization and packet separation in wireless ad hoc networks by known modulus algorithms

2005

IEEE J. Select. Areas Commun.

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Abstract-In mobile asynchronous ad hoc networks, multiple users may transmit packets at the same time. If a collision occurs, then in current systems both packets are lost and need to be retransmitted, reducing the overall throughput. To mitigate this, we consider to extend the receiver with a small antenna array, so that it can suppress interfering signals. To characterize the signal of interest, we propose to modulate it at the symbol rate by a known amplitude variation. This allows the corresponding multichannel receiver to estimate the beamformer weights that will suppress the interfering sources. We introduce "known modulus algorithms" to achieve this. We also derive synchronization algorithms to estimate the offset of the desired packet in an observation window, among interfering data packets. The algorithms are illustrated via simulations.Index Terms-Ad hoc networks, blind source separation, known modulus algorithm (KMA), packet offset estimation, synchronization.

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“…Stochastic techniques such as "transmitter induced cyclostationarity", initially derived for single user blind equalization [3][4][5] have recently been extended to multi-user convolutive channels [6] and OFDM [7]. An example of a deterministic source separation technique is [8], but it needs multiple transmit antennas per source (spatial redundancy).…”

Section: Introductionmentioning

confidence: 99%

Blind synchronization in asynchronous multiuser packet networks using KMA

Djapic

Veen

2003

2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications - SPAWC 2003 (IEEE Cat. No.03EX689)

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In a system with multiple (interfering) users transmitting data packets asynchronously, we consider to separate the user of interest by blind beamforming. The transmitter gives the signal a unique "color code" by modulating the power of each symbol, in a pattern known to the receiver. The beamformer can then be computed using CMA-like algorithms. In this paper, we consider the associated synchronization problem: the receiver does not know when a packet will arrive and has to detect the onset of a packet. We propose an extension of the Algebraic Known Modulus Algorithm (AKMA) to take this problem into account.

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MIMO blind second-order equalization method and conjugate cyclostationarity

Abstract: International audienc

Cited by 65 publications

References 21 publications

Blind channel and carrier frequency offset estimation using periodic modulation precoders

Blind channel and carrier frequency offset estimation using periodic modulation precoders

Synchronization and packet separation in wireless ad hoc networks by known modulus algorithms

Blind synchronization in asynchronous multiuser packet networks using KMA

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