The effect of filtering on the performance of OFDM systems

Faulkner, M.

doi:10.1109/25.892590

Cited by 113 publications

(61 citation statements)

References 6 publications

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“…However any such filtering induces time-domain smearing of the transmitted signals [18,19] which adds to the similar effects caused by the channel impulse response (CIR) between transmitter and receiver, all of which potentially induce inter-symbol interference (ISI).…”

Section: Methodsmentioning

confidence: 99%

Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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Orthogonal Frequency Division Multiplexing has been widely adopted in recent years due to its inherent spectral efficiency and robustness to impulsive noise and fading. For cognitive radio applications in particular, it can enable flexible and agile spectrum allocation, yet suffers from spectral leakage in the form of large side lobes, leading to inter-channel interference, unless mitigated carefully. Hence, recent OFDM-based standards such as 802.11p for vehicular communication and 802.11af for TV whitespace impose strict spectrum emission mask limits to combat adjacent channel interference. Stricter masks allow channels to operate closer together, improving spectral efficiency at the cost of implementation difficulty. Meeting the strict limits is a significant challenge for implementing both 802.11p and 802.11af, yet remains an important requirement for enabling cost-effective systems. This paper proposes a novel method that embeds baseband filtering within a cognitive radio architecture to meet the specification for the most stringent 802.11p and 802.11af masks, while allowing ten 802.11af sub-carriers to occupy a single basic channel without violating SEM specifications. The proposed method, performed at baseband, relaxes otherwise strict RF filter requirements, allowing the RF subsystem to be implemented using much less stringent 802.11a designs, allowing cost reductions.

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Section: Methodsmentioning

confidence: 99%

Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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“…The authors have shown in these works that BER can be reduced by using Raised Cosine Filters. The authors show the disadvantages of using reconstruction filters, anti-aliasing filters and other filters in [18]. They proved that these types of filters cause smearing in an OFDM symbol.…”

Section: Related Workmentioning

confidence: 99%

Effects Of Filters on DVB-T Receiver Performance Under AWGN, RAYLEIGH and RICEAN Fading Channels

Arifuzzaman¹,

Saleh²,

Tarique³

et al. 2013

IJCNC

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Digital Video Broadcasting -Terrestrial (DVB-T) has become a very popular technology for terrestrial digital television services. DVB-T is based on Orthogonal Frequency Division Multiplexing (OFDM) technique. OFDM is considered suitable for DVB-T system because of its low Inter-Symbol Interference (ISI). DVB-T has some limitations too including large dynamic signal range and sensitivity to frequency error. To overcome these limitations a good DVB-T receiver is a must. In this paper we address these issues. This paper has two-fold objectives (i) to investigate the performances of DVB-T system under different channel conditions, and (ii) to improve performance of DVB-T system by

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“…The authors have shown in these works that BER can be reduced by using RCF filters. It is shown in [23] that reconstruction filters, anti-aliasing filters and other filters cause smearing in an OFDM system. The author presented some numerical works in the same work and they suggested that Chebyshev II filter approximations should be the best choice.…”

Section: Related Workmentioning

confidence: 99%

Effects of Filters on the Performance of DVB-T Receiver

Arifuzzaman¹,

Islam²,

Tarique³

et al. 2013

IJWMN

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Digital Video Broadcasting-Terrestrial (DVB-T) is an international standard for digital television services. Orthogonal Frequency Division Multiplexing (OFDM) is the core of this technology. OFDM based system like DVB-T can handle multipath fading and hence it can minimize Inter Symbol Interference (ISI). DVB-T has some limitations too namely large dynamic range of the signals and sensitivity to frequency error. In order to overcome these limitations DVB-T receivers should be optimally designed. In this paper we address the issues related to optimal DVB-T receiver design. There of several signal processing units in a DVB-T receiver. A low-pass filter is one of them. In this paper, we consider some classic filters namely Butterworth, Chebyshev, and elliptic in the DVB-T receiver. The effects of different filters on the performances of DVB-T receiver have been investigated and compared in this paper under AWGN channel condition.

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The effect of filtering on the performance of OFDM systems

Cited by 113 publications

References 6 publications

Spectrally efficient emission mask shaping for OFDM cognitive radios

Spectrally efficient emission mask shaping for OFDM cognitive radios

Effects Of Filters on DVB-T Receiver Performance Under AWGN, RAYLEIGH and RICEAN Fading Channels

Effects of Filters on the Performance of DVB-T Receiver

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