Pilot spacing in orthogonal frequency division multiplexing systems on practical channels

Rinne, J.; Renfors, Markku

doi:10.1109/30.555792

Cited by 99 publications

(19 citation statements)

References 7 publications

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“…It is better resistance to fast fading channel. As only few subcarriers contain pilot signal, channel response of those subcarrier in which pilot is absent are estimated using interpolating neighboring pilot sub-channels [7] [8] . In this paper we consider a time-varying channel, where the channel transfer function changes significantly from one block to next block.…”

confidence: 99%

OFDM pilot based channel estimation

Nadar¹,

Koti²,

Jayaswal³

2014

2014 International Conference on Advances in Engineering &Amp; Technology Research (ICAETR - 2014)

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Wireless communication is a promising technology for a wide range of applications from TV remote control to satellite based TV systems. As the need for high data rate is increasing day by day the need for multicarrier communication has come in to picture. Orthogonal frequency division multiplexing (OFDM) is a multicarrier transmission technique used for high data rate wireless transmission. In OFDM the transmitter modulates the message bit sequence in to symbols, performs IFFT, converts in to time domain signal and transmits through a wireless channel. The information usually get distorted due to characteristics of the channel So it is required to estimate the channel characteristics and compensate at the receiver to recover the information sent. In this paper we explore two estimation techniques Least Square (LS) and Minimum Mean Square Error (MMSE) using International Telecommunication Union (ITU) vehicular A channel model, further symbol error rate is calculated for different Doppler frequencies.

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confidence: 99%

OFDM pilot based channel estimation

Nadar¹,

Koti²,

Jayaswal³

2014

2014 International Conference on Advances in Engineering &Amp; Technology Research (ICAETR - 2014)

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“…4, given the maximum velocity V max = 120km/h. In order to show the effectiveness of 2D-EDFTI, especially TD-EDFTI proposed in this study, other channel estimation algorithms are also simulated for comparisons, including 2D-DFTI [5,7], FD-EDFTI [12]+TD-Linear interpolation (LI) [13], FD-EDFTI+TD-Weighted multislot average (WMSA) [14] and FD-EDFTI +TD-DFTI. From Fig.…”

Section: B Doubly-selective Channel Estimation Based On 2d-edftimentioning

confidence: 99%

“…Channel state information (CSI) is critical for the performance of OFDM systems and pilot-based channel estimation is often used to obtain CSI in practice [4][5][6][7][8][9][10][11][12][13][14]. Generally speaking, scattered pilots will be inserted into the twodimensional time-frequency gird of OFDM systems [2][3][4][5]7] (also know as pilot symbol aided modulation (PSAM)), which can capture the variations of doubly-selective fading channels more efficiently than block-type or comb-type pilot pattern.…”

Section: Introductionmentioning

confidence: 99%

Doubly-Selective Channel Estimation for Packet OFDM Systems with Virtual Subcarriers

Hou¹,

Zhang²,

Kayama³

2008

2008 IEEE 68th Vehicular Technology Conference

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Channel estimation based on two-dimensional discretetime Fourier transform interpolation (2D-DFTI) is suitable for orthogonal frequency division multiplexing (OFDM) systems because of its robustness to doubly-selective fading channels and high computational efficiency. However, its performance will degrade significantly for packet OFDM systems with virtual subcarriers due to the Gibbs phenomenon in both frequencydomain and time-domain. We have already proposed the frequency- domain enhanced DFT interpolation (FD-EDFTI) to effectively suppress the Gibbs phenomenon in frequency-domain, while in this paper the time-domain enhanced DFT interpolation (TD-EDFTI) is further proposed to mitigate the Gibbs phenomenon in time-domain.Therefore, doubly-selective channel estimation based on 2D-EDFTI can be easily implemented for packet OFDM systems with virtual subcarriers by concatenating FD-EDFTI with TD-EDFTI to efficiently suppress the Gibbs phenomenon in both frequencydomain and time-domain, while keeping good robustness and high computational efficiency.

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“…For the kth data subcarrier, where k = mD + p, p = μD, 0 ≤ μ < 1, the estimated channel response using the linear interpolation algorithm [7][8] [14] is given bŷ…”

Section: A Polynomial-based Interpolatorsmentioning

confidence: 99%

“…Albeit optimal in the sense of minimizing mean squared estimation error, it is still computationally expensive, requiring matrix inversion of the channel covariance matrix. Linear interpolation has also been proposed to approximate the real frequency-domain channel response [7] [8]. In [9], second-order interpolation has been shown to outperform linear interpolation.…”

mentioning

confidence: 99%

Adaptive raised-cosine channel interpolation for pilot-aided OFDM systems

Tsai

Chiueh

2009

IEEE Trans. Wireless Commun.

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In this paper, we first show equivalence of OFDM channel estimation using time-domain windowing and using frequency-domain interpolation. Based on this equivalence, a new frequency-domain channel interpolator featuring the advantage of time-domain channel impulse response windowing is proposed. Furthermore, the proposed raised-cosine channel interpolator can adaptively adjust its coefficients to accommodate various channel power delay profiles. Both theoretical and simulation results verify that the proposed interpolator achieves more accurate channel estimation performance than other existing solutions.Index Terms-Orthogonal frequency division multiplex, interpolation, pilot-based, channel estimation.

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Pilot spacing in orthogonal frequency division multiplexing systems on practical channels

Cited by 99 publications

References 7 publications

OFDM pilot based channel estimation

OFDM pilot based channel estimation

Doubly-Selective Channel Estimation for Packet OFDM Systems with Virtual Subcarriers

Adaptive raised-cosine channel interpolation for pilot-aided OFDM systems

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