OFDM and its Major Concerns: A Study with Way Out

Saxena, Rajiv; Joshi, Hem Dutt

doi:10.1080/09747338.2013.10876104

Cited by 20 publications

(3 citation statements)

References 101 publications

(177 reference statements)

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“…Orthogonal frequency division multiplexing (OFDM) is a rapidly evolving technique to deliver high data rate transmissions with bandwidth efficiency, especially in challenging environments susceptible to fading and efficient spectrum utilisation [4][5][6]. The inherent resilience of OFDM against multipath channels and its high transmission rate make it preferable for different communication systems [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Efficient Wideband Transmission and Direction-Finding Implementation Scheme in Noisy Rician Channels for Wearable Monitoring

Aldelemy,

Oguntala,

Gadhafi

et al. 2023

Preprint

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This paper proposes a new technique for wideband transmission and direction-finding using orthogonal frequency division multiplexing (OFDM) for wearable devices in noisy Rician channels. The technique uses a coded OFDM signal combined with a pseudo-random permutation and a Walsh sequence to mitigate inter-carrier interference, peak-to-average power ratio, and frequency offset. The technique also inserts a pilot symbol into each OFDM block and uses it for frequency offset estimation, channel estimation, message detection, and angle of arrival estimation. The technique employs a delay discrimination algorithm to extract the first arriving impulse from each antenna channel and then applies a direction-finding algorithm to estimate the angle of arrival. The technique is evaluated through rigorous simulations using MATLAB. It shows superior performance and reliability compared to existing methods in terms of signal-to-noise ratio, bit error rate, and angle error.

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Section: Introductionmentioning

confidence: 99%

Efficient Wideband Transmission and Direction-Finding Implementation Scheme in Noisy Rician Channels for Wearable Monitoring

Aldelemy,

Oguntala,

Gadhafi

et al. 2023

Preprint

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“…Due to an increasing amount of traffic in recent wireless communication systems, many schemes for high reliability and bandwidth efficiency have been studied. One of the systems to obtain high data rate and bandwidth efficiency is orthogonal frequency division multiplexing (OFDM) [1,2]. Also, relay systems such as amplifying-and-forward (AF) and decoding-and-forward (DF) have been studied for expanding cell coverage [3].…”

Section: Introductionmentioning

confidence: 99%

An Interference Cancellation Scheme for High Reliability Based on MIMO Systems

Park

Song

2018

Applied Sciences

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This article proposes a new interference cancellation scheme in a half-duplex based two-path relay system. In the conventional two-path relay system, inter-relay-interference (IRI) which severely degrades the error performances at a destination occurs because a source and a relay transmit signals simultaneously at a specific time. The proposed scheme removes the IRI at a relay for higher signal-to-interference plus noise ratio (SINR) to receive interference free signal at a destination, unlike the conventional relay system, which removes IRI at a destination. To handle the IRI, the proposed scheme uses multiple-input multiple-output (MIMO) signal detection at the relays and it makes low-complexity signal processing at a destination which is a usually mobile user. At the relays, the proposed scheme uses the low-complexity QR decomposition-M algorithm (QRD-M) to optimally remove the IRI. Also, for obtaining diversity gain, the proposed scheme uses cyclic delay diversity (CDD) to transmit the signals at a source and the relays. In simulation results, the error performance for the proposed scheme is better when the distance between one relay and another relay is low unlike the conventional scheme because the QRD-M detects received signal in order of higher post signal-to-noise ratio (SNR).

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“…In OFDM, in addition to the rotational effect called Common Phase Error (CPE), PHN also causes leakage of DFT, which subsequently produces ICI, serious 'in-band' effect of PHN, which destroys the orthogonality of the subcarriers by spreading their energies on top of each other [1][2][3][4]. The 'out-of-band' effect comes into play in the multiple access scheme of the OFDM (OFDMA), causing MUI.…”

Section: Introductionmentioning

confidence: 99%