Linear Precoding Assisted Blind Channel Estimation for OFDM Systems

Lin, Rui; Petropulu, Athina P.

doi:10.1109/tvt.2005.844681

Cited by 59 publications

(31 citation statements)

References 25 publications

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“…, L − 1. The frequency domain channel matrix for each transmitreceive antenna pair is defined as (18), the output of IOTA demodulator at the j-th receive antenna at can be expressed as…”

Section: Implementation Of Mimo-iota System With Polyphase Filtersmentioning

confidence: 99%

“…In this paper, we will study blind channel estimation schemes for linearly precoded IOTA systems. Blind channel estimation is achieved at the receiver by using the structure of auto-correlation and cross-correlation matrices introduced by precoding [18]. To the best of our knowledge, linear precoding based blind channel estimation has not yet been investigated for FBMC systems in general and IOTA systems in particular.…”

Section: Introductionmentioning

confidence: 99%

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Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Xiao

et al. 2012

IET Communications

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Orthogonal Frequency Division Multiplexing (OFDM) technique has gained increasing popularity in both wired and wireless communication systems. However, in the conventional OFDM systems the insertion of a cyclic prefix (CP) and the transmission of periodic training sequences for purpose of channel estimation decrease the system's spectral efficiency. As an alternative to OFDM, isotropic orthogonal transform algorithm (IOTA) based multicarrier system adopts a proper pulse shaping with good time and frequency localization properties to avoid interference and maintain orthogonality in real field among sub-carriers without the use of CP. In this paper, we propose linearly precoded IOTA based multicarrier systems to achieve blind channel estimation by utilizing the structure of auto-correlation and cross-correlation matrices introduced by precoding. The results 1 show that the proposed IOTA based multicarrier systems achieve better power and spectral efficiency compared to the conventional OFDM systems.

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“…, L − 1. The frequency domain channel matrix for each transmitreceive antenna pair is defined as (18), the output of IOTA demodulator at the j-th receive antenna at can be expressed as…”

Section: Implementation Of Mimo-iota System With Polyphase Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Xiao

et al. 2012

IET Communications

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“…Inter-block precoding was previously applied to channel estimation for OFDM systems in [16] to exploit time diversity introduced by time varying channels. However, here, even if the channel is completely static, interblock precoding allows one to exploit the spatial diversity that is introduced by cooperation.…”

Section: Relation Of Contribution To the Literaturementioning

confidence: 99%

“…This effect is analogous to employing two transmitters. We should note that interblock precoding was used in [16] to exploit time diversity introduced by time varying channels. Here, even if the channel is completely static, interblock precoding allows us to exploit spatial diversity introduced by cooperation.…”

Section: Eurasip Journal On Wireless Communications and Networkingmentioning

confidence: 99%

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A precoded OFDMA system with user cooperation

Yatawatta²,

Petropulu

2008

2008 42nd Annual Conference on Information Sciences and Systems

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A new cooperative scheme for a two-user orthogonal frequency division multiple access (OFDMA) uplink communication scenario is proposed. Each user is equipped with one transmit/receive antenna. Before transmission, inter-block linear precoding is introduced to pairs of blocks. The cooperative transmission is implemented in cycles of three time slots. During each slot, a user transmits either his data, or a weighted mixture of his data and the data that he received in previous slots of the same cycle. The weights are obtained in an optimum fashion, so that a user that faces deep fading on certain subcarriers can benefit from the other user's channel, without taxing significantly the resources of that user. It is shown that the proposed scheme achieves the maximum available diversity for both users (full cooperation), or for the weak user (half cooperation) without increasing the number of antennas needed as compared to an energy-equivalent noncooperative OFDMA system that also uses inter-block precoding. Further, the proposed use of inter-block precoding allows one to exploit the cooperation induced diversity in 1.5 slots on the average; 2 slots would be needed if intra-block precoding was used instead.

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References

2013

Wireless Communications

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Linear Precoding Assisted Blind Channel Estimation for OFDM Systems

Cited by 59 publications

References 25 publications

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

A precoded OFDMA system with user cooperation

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