Reducing ICI in OFDM Systems Using a Proposed Pulse Shape

Mourad, Hebat-Allah M.

doi:10.1007/s11277-006-9099-5

Cited by 47 publications

(49 citation statements)

References 7 publications

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“…SP pulse shape has the highest amplitude in the main lobe, but at the sidelobes it has lower amplitude than BTRC. This property provides better CIR performance than that of BTRC as shown in [Mourad, 2006]. As seen in this figure the amplitude of ISP pulse shape is the lowest at all frequencies.…”

mentioning

confidence: 73%

“…Thus, an accurate and efficient Inter-Carrier Interference (ICI) reduction procedure is essential to demodulate the received data. Several methods have been presented to reduce ICI, including windowing at the receiver [Muschallik, 1996;Müller-Weinfurtner, 2001;Song & Leung, 2005], the use of pulse shaping [Tan & Beaulieu, 2004;Mourad, 2006;Maham & Hjørungnes, 2007], self-cancellation schemes [Zhao & Haggman, 2001], and frequency domain equalization. The next part of this chapter introduces these techniques.…”

Section: Ofdm Systemmentioning

confidence: 99%

“…Then, there exists no ICI term if ∆ and θ are zero. The power of the desired signal can be calculated as [Tan & Beaulieu, 2004;Mourad, 2006;Kumbasar & Kucur, 2007]:…”

Section: Pulse Shapingmentioning

confidence: 99%

“…While deriving the theoretical CIR expression, the additive noise is omitted. By using (23) and (25), the CIR can be derived as [Tan & Beaulieu, 2004;Mourad, 2006;Kumbasar & Kucur, 2007]:…”

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confidence: 99%

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ICI Reduction Methods in OFDM Systems

Moghaddam¹,

Mohebbi²

2011

Recent Advances in Wireless Communications and Networks

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mentioning

confidence: 73%

Section: Ofdm Systemmentioning

confidence: 99%

“…Then, there exists no ICI term if ∆ and θ are zero. The power of the desired signal can be calculated as [Tan & Beaulieu, 2004;Mourad, 2006;Kumbasar & Kucur, 2007]:…”

Section: Pulse Shapingmentioning

confidence: 99%

“…While deriving the theoretical CIR expression, the additive noise is omitted. By using (23) and (25), the CIR can be derived as [Tan & Beaulieu, 2004;Mourad, 2006;Kumbasar & Kucur, 2007]:…”

mentioning

confidence: 99%

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ICI Reduction Methods in OFDM Systems

Moghaddam¹,

Mohebbi²

2011

Recent Advances in Wireless Communications and Networks

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“…Extreme fading of the signal amplitude and Inter Symbol Int introduced during transmission through t channel and frequency selectivity of the channel appearing at the receiver side [4], [5] are responsible for a high probability of errors and reduced overall performance of the system. Several methods like adaptive equalization and channel coding have been developed to reduce the above effect.[6], [7]. The orthogonal Frequency division multiplexing (OFDM) a multi carrier system can be thought of as a solution and is used in several applications such as asymmetric digital subscriber lines (ADSL), a system that makes high bit-rates possible over twisted-pair copper wires [8], [9], it has also been accepted for several wireless LAN standards, as well as a number of mobile multimedia applications [1], [10] and protocols like IEEE 802.11a standard, terrestrial digital video broadcasting (DVB T) and digital audio broadcasting (DAB) [11].…”

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confidence: 99%

Effects of Filtering on Ber Performance of an Ofdm System

Kaur¹

2013

IJRET

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Index Terms: AWGN, ICI, OFDM, Bit E ----------------------------------------------------------------------- INTRODUCTIONHigh bit error rate(BER) and high bandwidth efficiency the major desiresfor modern communication sy the needs for a variety of new and high quality services developed and delivered to the society [1]. The effect of multipath delay, spread and fading of signals in the wireless environment is usually unavoidable [2], [3]. Extreme fading of the signal amplitude and Inter Symbol Int introduced during transmission through t channel and frequency selectivity of the channel appearing at the receiver side [4], [5] are responsible for a high probability of errors and reduced overall performance of the system. Several methods like adaptive equalization and channel coding have been developed to reduce the above effect.[6], [7]. The orthogonal Frequency division multiplexing (OFDM) a multi carrier system can be thought of as a solution and is used in several applications such as asymmetric digital subscriber lines (ADSL), a system that makes high bit-rates possible over twisted-pair copper wires [8], [9], it has also been accepted for several wireless LAN standards, as well as a number of mobile multimedia applications [1], [10] and protocols like IEEE 802.11a standard, terrestrial digital video broadcasting (DVB T) and digital audio broadcasting (DAB) [11]. The purpose of this paper is to investigate how OFDM performs in an Additive White Gaussian Noise (AWGN) ch pulse shaping filter like Raised cosine, FIR Nyquist and Matched SQRT Raised Cosine. In this channel one path between transmitter and receiver and attenuation and noise is considered. In this paper, we define the simulation methodology of OFDM in section 2 and simulate the OFDM system using Matlab. The mathematical model and theoretically simulated constellation diagrams for various pulse shapes are presented and a procedure for symbol IJRET: International Journal of Research in Engineering and

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Reducing ICI effect in OFDM system using low‐complexity Kalman filter based on comb‐type pilots arrangement

Mousa¹,

Mahmoud²

2010

Int J Communication

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SUMMARYIn OFDM systems, time-varying channels destroy orthogonality between subcarriers causing Inter-Carrier Interference. To reduce this effect, a Kalman filter, as a benchmark, is used for channel estimation, based on comb-type pilot arrangements of the OFDM system. An advantage of comb-type pilot arrangements in channel estimation is the ability to track the variation of the channel caused by Doppler frequency. Kalman method has been proposed to estimate the channel frequency response (CFR) at the pilot locations, then CFR, at data subchannels, is obtained by means of interpolation between estimates at pilot locations. The low-complexity Kalman method is introduced to reduce the complexity of the system while achieving the same BER/SNR. Different types of interpolations have been also compared such as Low-pass, Splinecubic and Linear interpolation methods. The BER/SNR performance of BPSK modulation schemes are considered for time varying Rayleigh fading channels. Our results has shown that the low-complexity Kalman estimation, used with the pilot arrangement and a suitable interpolation method, gives almost the same performance as that of the Kalman method specially for low SNR values and hence the effect of Doppler shift effect is controlled.

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Reducing ICI in OFDM Systems Using a Proposed Pulse Shape

Cited by 47 publications

References 7 publications

ICI Reduction Methods in OFDM Systems

ICI Reduction Methods in OFDM Systems

Effects of Filtering on Ber Performance of an Ofdm System

Reducing ICI effect in OFDM system using low‐complexity Kalman filter based on comb‐type pilots arrangement

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