Sensitivity of FFT-equalised zero-padded OFDM systems to time and frequency synchronisation errors

Athaudage, C.R.N.; Angiras, R.R.V.

doi:10.1049/ip-com:20045333

Cited by 11 publications

(12 citation statements)

References 16 publications

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“…If a small change in the plaintext (one bit) makes a large change in the ciphertext (half of its bits), then the Avalanche effect is evident and the algorithm has a powerful diffusion mechanism. This is guaranteed if we can assure that a bit change in the plaintext will affect at least one bit in each block of the input to the encryption algorithm, and the diffusion mechanism in the encryption algorithm will propagate this change through each block [44]. From Fig.…”

Section: Effect Of the Normalized Block Size On Diffusionmentioning

confidence: 96%

Efficient Transmission of Encrypted Images with OFDM in the Presence of Carrier Frequency Offset

El-Dokany

El-Rabaie

Elhalafawy

et al. 2015

Wireless Pers Commun

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In this paper, the impact of carrier frequency offset (CFO) and CFO compensation on the transmission of encrypted images with different orthogonal frequency division multiplexing (OFDM) versions is studied. The investigated OFDM versions are the fast Fourier transform OFDM, the discrete cosine transform OFDM, and the discrete wavelet transform OFDM. A comparison between four encryption algorithms with images transmitted through different OFDM versions is presented. These algorithms are data encryption standard, advanced encryption standard, RC6, and chaotic Baker map. This comparison aims to select the most appropriate version of OFDM, and the most suitable image encryption algorithm for efficient image transmission. In the simulation experiments, the peak signal-to-noise ratio at the receiver is used as an evaluation metric for the decrypted image quality.

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Section: Effect Of the Normalized Block Size On Diffusionmentioning

confidence: 96%

Efficient Transmission of Encrypted Images with OFDM in the Presence of Carrier Frequency Offset

El-Dokany

El-Rabaie

Elhalafawy

et al. 2015

Wireless Pers Commun

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“…The zero-padded FFT offers increased frequency resolution by extending the length of the input data sequence in the time domain by padding with zeros at the tail of the discrete-time signal. Because of this, it has been widely used for wireless communications and radar systems that require high-frequency resolution [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Area-Efficient Pipelined FFT Processor for Zero-Padded Signals

et al. 2019

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This paper proposes an area-efficient fast Fourier transform (FFT) processor for zero-padded signals based on the radix-2 2 and the radix-2 3 single-path delay feedback pipeline architectures. The delay elements for aligning the data in the pipeline stage are one of the most complex units and that of stage 1 is the biggest. By exploiting the fact that the input data sequence is zero-padded and that the twiddle factor multiplication in stage 1 is trivial, the proposed FFT processor can dramatically reduce the required number of delay elements. Moreover, the 256-point FFT processors were designed using hardware description language (HDL) and were synthesized to gate-level circuits using a standard cell library for 65 nm CMOS process. The proposed architecture results in a logic gate count of 40,396, which can be efficient and suitable for zero-padded FFT processors.

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“…Thus (14) 2) When the synchronization symbol is presents in only one of the two signal segments, using the distribution of the peak (absolute) ACF value given by (25) in Appendix B, The false alarm probability is (15) 3) When no synchronization symbol is present in either signal segment, the distribution of the peak (absolute) ACF value is given by (26) in Appendix B. The false alarm probability becomes (16) For the proposed parallel signal detector, we can then derive the probability of correct detection and identification of the TFC group when the synchronization symbols are present. Assume all 24 repeated synchronization symbols in a preamble of a data packet are available [1], this probability can be approximated as (17) for TF code 1-4 where there are 8 synchronization symbols on each frequency sub-band; and (18) for TF code 5-7 where all 24 synchronization symbols are in the same band.…”

Section: A the Evaluation Of Signal Detection And Tfc Identificationmentioning

confidence: 99%

“…Research on the SYNC design has been active for over a decade, either for general (single-band) OFDM transceiver structures [4], [6]- [8], [10]- [12], [14], [16], [20], [24], [27] or for specific communication systems using OFDM modulation, such as DVB-T [5], 802.11a WLAN [19] and MB-OFDM UWB [15], [17], [18], [21]- [23], [25], [26]. MB-OFDM UWB systems introduce frequency hopping, which brings up some unique issues for their SYNC design.…”

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confidence: 99%

A Synchronization Design for UWB-Based Wireless Multimedia Systems

Ye¹,

Duan

Orlik

et al. 2010

IEEE Trans. on Broadcast.

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Multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) technology offers large throughput, low latency and has been adopted in wireless audio/video (AV) network products. The complexity and power comsumption, however, are still major hurdles for the technology to be widely adopted. In this paper, we propose a unified synchronizer design targeted for MB-OFDM transceiver that achieves high performance with low implementation complexity. The key component of the proposed synchronizer is a parallel auto-correlator structure in which multiple ACF units are instantiated and their outputs are shared by functional blocks in the synchronizer, including preamble signal detection, time-frequency code identification, symbol timing, carrier frequency offset estimation and frame synchronization. This common structure not only reduces the hardware cost but also minimizes the number of operations in the functional blocks in the synchronizer as the results of a large portion of computation can be shared among different functional blocks. To mitigate the effect of narrowband interference (NBI) on UWB systems, we also propose a low-complexity ACF-based frequency detector to facilitate the design of (adaptive) notch filter in analog/digital domain. The theoretical analysis and simulation show that the performance of the proposed design is close to optimal, while complexity is significantly reduced compared to existing work. IEEE Transactions on BroadcastingThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Abstract-Multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) technology offers large throughput, low latency and has been adopted in wireless audio/video (AV) network products. The complexity and power consumption, however, are still major hurdles for the technology to be widely adopted. In this paper, we propose a unified synchronizer design targeted for MB-OFDM transceiver that achieves high performance with low implementation complexity. The key component of the proposed synchronizer is a parallel auto-correlator structure in which multiple ACF units are instantiated and their outputs are shared by functional blocks in the synchronizer, including preamble signal detection, time-frequency code identification, symbol timing, carrier frequency offset estimation and frame synchronization. This common structure not only reduces the hardware co...

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Sensitivity of FFT-equalised zero-padded OFDM systems to time and frequency synchronisation errors

Cited by 11 publications

References 16 publications

Efficient Transmission of Encrypted Images with OFDM in the Presence of Carrier Frequency Offset

Efficient Transmission of Encrypted Images with OFDM in the Presence of Carrier Frequency Offset

Area-Efficient Pipelined FFT Processor for Zero-Padded Signals

A Synchronization Design for UWB-Based Wireless Multimedia Systems

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