Preamble and embedded synchronization for RF carrier frequency-hopped OFDM

Kleider, J.E.; Maalouli, G.; Gifford, S.; Chuprun, S.

doi:10.1109/jsac.2005.845421

Cited by 21 publications

(4 citation statements)

References 20 publications

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“…Dong et al [14] showed that SI schemes can outperform TDM schemes when the channel becomes sufficiently time varying. For a packet-based multicarrier system, Kleider et al [15] showed that SI pilots can be utilized for channel acquisition while incurring only a 1-dB penalty when compared to a TDM training scheme. Thus, the idea of superimposing the data for transparency is motivated by previous work on channel estimation and authentication that provides specific examples of success.…”

Section: Introductionmentioning

confidence: 99%

Physical-Layer Authentication

Baras

Sadler

2008

IEEE Trans.Inform.Forensic Secur.

230

133

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Abstract-Authentication is the process where claims of identity are verified. Most mechanisms of authentication (e.g., digital signatures and certificates) exist above the physical layer, though some (e.g., spread-spectrum communications) exist at the physical layer often with an additional cost in bandwidth. This paper introduces a general analysis and design framework for authentication at the physical layer where the authentication information is transmitted concurrently with the data. By superimposing a carefully designed secret modulation on the waveforms, authentication is added to the signal without requiring additional bandwidth, as do spread-spectrum methods. The authentication is designed to be stealthy to the uninformed user, robust to interference, and secure for identity verification. The tradeoffs between these three goals are identified and analyzed in block fading channels. The use of the authentication for channel estimation is also considered, and an improved bit-error rate is demonstrated for time-varying channels. Finally, simulation results are given that demonstrate the potential application of this authentication technique.

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Section: Introductionmentioning

confidence: 99%

Physical-Layer Authentication

Baras

Sadler

2008

IEEE Trans.Inform.Forensic Secur.

230

133

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“…The binary system proposed in [11] was extended to the Mary case in [12]. With the consistent improvement of the receivers' computational power, more attention has been given lately towards coherent modulation schemes [13] [17].…”

Section: Introductionmentioning

confidence: 99%

Novel multiple-access interference reduction technique for multiuser FH-OFDM networks

Al-Dweik

Hazmi

Sharif

et al. 2010

2010 IEEE International Conference on Communication Systems

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In this work, a novel solution is proposed to reduce the impact of multiple access interference (MAI) in multiuser frequency hopping (FH) networks based on orthogonal frequency division multiplexing (OFDM). In the proposed scheme, the sam ples in each transmitted OFDM block are collected from different OFDM symbols. At the receiver side, restoring the original samples' order spreads the samples of any OFDM block with MAI over several OFDM symbols. Consequently, the impact of the MAI is remarkably reduced. Simulation results have demonstrated that the number of users in the proposed FHOFDM network can be increased by a factor of 300% when compared with the conventional FHOFDM networks.

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“…Moreover, filtering in the time domain is only applicable for slowly time-varying channel. In some special OFDM systems, such as frequency-hopping (FH)-OFDM systems [6], it is assumed that channel parameters are different between two consecutive hop durations, therefore new channel estimation is needed over each hop duration. In [7], adaptive-asymmetric filter in the transform domain is used to decrease the loss of channel information at high SNRs.…”

Section: Introductionmentioning

confidence: 99%

Robust DFT-based channel estimation for burst OFDM systems

Shi

Er-yang

et al. 2010

2010 International Conference on Wireless Communications &Amp; Signal Processing (WCSP)

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A robust discrete Fourier transform (DFT)-based channel estimation for burst orthogonal frequency division multiplexing (OFDM) systems is proposed in this paper. The conventional DFT-based channel estimation methods improve the performance by neglecting nonsignificant channel taps. However, the error floor occurs at high signal-to-noise when useful channel information is discarded, especially in non-sample-spaced channel. To solve this problem, we propose a modified DFTbased channel estimation method. Based on the noise power estimated in the frequency domain, which does not suffer from the energy leakage of channel path, we design the threshold for detecting the significant channel taps. Moreover, a wider region with fixed width is designed to decrease the energy loss of channel. Simulation results show that the proposed method is robust to the distribution of channel paths, and the error floor is eliminated.

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Preamble and embedded synchronization for RF carrier frequency-hopped OFDM

Cited by 21 publications

References 20 publications

Physical-Layer Authentication

Physical-Layer Authentication

Novel multiple-access interference reduction technique for multiuser FH-OFDM networks

Robust DFT-based channel estimation for burst OFDM systems

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