A New Scheme of ICI Self-Cancellation in OFDM System

Bishnu, Arijit; Jain, Anjana; Shrivastava, Anurag

doi:10.1109/csnt.2013.34

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…But the occurrence of frequency offset due to the Doppler spread or frequency shift resulting in ICI is random, henceforth only its impact can be mitigated. Many different ICI mitigation schemes have been extensively explored to combat the Inter-Carrier Interference in OFDM systems, including frequencydomain equalization [8], time-domain windowing [9], and the ICI self-cancellation (SC) scheme [10]- [17], frequency offset estimation and compensation techniques [18] and so on. Among the schemes, the ICI self-cancellation scheme is a simple method for ICI reduction.…”

Section: Orthogonal Frequency Division Multiplexingmentioning

confidence: 99%

BER Analysis of ICI Self Cancellation Schemes for OFDM Based Wireless Systems

Bahl¹,

Kaur²,

Buttar³

2014

IJPTT

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the consistently rising demand for very high rate data transmission over wireless mediums requires ingenious usage of electromagnetic resources considering constraints like power consumption, spectrum efficiency, robustness against multipath propagation and implementation complexity. Orthogonal frequency division multiplexing (OFDM) is a propitious technique for next generation wireless communication systems. Nevertheless it suffers from Inter-Carrier Interference (ICI) due to its susceptibility to the frequency offset caused by frequency difference between local oscillator of transmitter and receiver or due to Doppler shift. This paper epitomize self-cancellation techniques to mitigate ICI effect for OFDM based wireless systems. The performances of ICI self-cancellation schemes have been in terms of the bit error rate (BER). Simulation results exhibit ICI self-cancellation Scheme that outperforms other existing self-cancellation methods and robustness to large frequency offset.

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Section: Orthogonal Frequency Division Multiplexingmentioning

confidence: 99%

BER Analysis of ICI Self Cancellation Schemes for OFDM Based Wireless Systems

Bahl¹,

Kaur²,

Buttar³

2014

IJPTT

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“…A new scheme of ICI self-cancellation is proposed [5], in which the symbol allocation is given as X (k) = X(k), X (k + 1) = e −jπ/2 X * (k) (where X * (k) is the conjugate of X(k)). It means the data symbol modulated at (k + 1) th subcarrier is phase rotated by −π/2 of the conjugate of the data symbol modulated at k th subcarrier.…”

Section: Analysis Of Ici In Ofdmmentioning

confidence: 99%

“…ICI degrades the performance of OFDM, so ICI is the main issue of OFDM. Many methods have been proposed to mitigate the ICI in literature, including self -cancellation [3]- [5], pulse shaping [6]- [7] etc.…”

Section: Introductionmentioning

confidence: 99%

ICI Reduction using Quadrature Kalman Filter for OFDM System

Bishnu¹,

Jain²,

Shrivastava³

2013

IJCA

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Orthogonal frequency division multiplexing (OFDM) is a technology for high data rate broadband wireless communication system. It provides high spectral efficiency. The main limitation which degrades the performance of OFDM is inter-carrier interference (ICI), which is caused by Doppler frequency offset and transceiver local oscillator frequency offset. To mitigate ICI effect, a new method of ICI reduction using quadrature Kalman filter (QKF) is proposed and investigated. In this paper, we compared proposed method with pulse shaping and self-cancellation methods of ICI reduction for different digital modulation scheme. For simulation purpose AWGN channel is considered and results show that the proposed method outperforms the existing ICI reduction methods.

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“…Currently, there are many methods for reducing ICI in the OFDM systems, which have been extensively investigated, such as frequency-domain equalization [7], self-cancellation [8], frequency offset estimation [9,10], correlative coding [11], minimum mean squared error (MMSE) [12], and multiple resampling [13]. Since the UWA channel is a narrow bandwidth channel [14], we don't use preamble in each OFDM frame as suggested in many common approaches [15,16].…”

Section: Introduction *mentioning

confidence: 99%

Proposal for a Doppler Shift Compensation Method Using Non-Uniform FFT with Pilot Carrier Frequency for OFDM-Based Underwater Acoustic Communication Systems

2023

JST: SSAD

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In this paper, we propose a method that uses the non-uniform Fast Fourier Transform (FFT) to compensate for Doppler frequency shifts in orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication systems. To estimate the Doppler frequency shift, the paper proposes using a pilot carrier frequency (PCF) that is identified by transmitting with greater power in the frequency domain compared to other subcarriers. This identifier helps estimate both the Doppler frequency shift and the channel. The paper proposes estimating and compensating for the Doppler frequency shift in two steps: Step 1 performs coarse frequency synchronization, where the Doppler frequency shift is determined by using PCF signal. The Doppler shift correction is obtained by re-sampling the received signal, and then interpolating re-sampled signal. However, the Doppler shift compensation in the step 1 cannot correct the phase distortion of the measured PCF signal. Therefore, performing step 2, known as fine frequency synchronization, is necessary. In this step, the correction for the phase distortion is determined based on the phase difference between the two consecutive OFDM signals in one frame. The remaining Doppler frequency shift is adjusted based on the phase deviation, using the non-uniform FFT. By using the non-uniform FFT, the complexity of the ICI compensation is significantly reduced, and the quality of Doppler shift compensation is improved. The experience results show that the transmitted text will be decoded correctly by using the proposed technique

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A New Scheme of ICI Self-Cancellation in OFDM System

Cited by 8 publications

References 10 publications

BER Analysis of ICI Self Cancellation Schemes for OFDM Based Wireless Systems

BER Analysis of ICI Self Cancellation Schemes for OFDM Based Wireless Systems

ICI Reduction using Quadrature Kalman Filter for OFDM System

Proposal for a Doppler Shift Compensation Method Using Non-Uniform FFT with Pilot Carrier Frequency for OFDM-Based Underwater Acoustic Communication Systems

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