On channel estimation in OFDM systems

Beek, Jaap van de; Edfors, Ove; Sandell, Magnus; Wilson, Sarah Kate; Börjesson, Per Ola

doi:10.1109/vetec.1995.504981

Cited by 1,292 publications

(719 citation statements)

References 4 publications

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“…It is worth noting that a totally different looking Figure 2 will be obtained if we choose another set of p 0 , p 1 and p, but the asymptotical behavior as f D T 0 will definitely be the same, as proved and explained in (8). Therefore, it can be inferred that WF-LS with orders 2 implicitly exists certain linearity which results in its failure in high speed communication environments, in which case the approximate linearity of the channel frequency responseĤ p 0 (k) andĤ p 1 (k) between p 0 and p 1 disappears because of fast fading channels.…”

Section: Substituting (3) Into (2) and Lettingmentioning

confidence: 63%

“…Channel estimation problems in this situation have been well studied and solved in the literature. For example, least squares (LS) or minimum mean square error (MMSE) based channel estimation methods [8] can be used to estimate the diagonal of the channel frequency response matrix, or we can further proceed to eliminate noise in transformdomain [9]. On the other hand, Considering that Wiener filter (WF) is the best interpolation method at the time dimension in terms of minimizing MSE [10], Dong et al [11] and Zheng and Xiao [12] derive the expression for Wiener filter combined LS based channel estimation (hereafter called WF-LS), combining LS based channel estimation with WF.…”

Section: Introductionmentioning

confidence: 99%

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Channel estimation in OFDM systems operating under high mobility using Wiener filter combined basis expansion model

Zhong

Lei

Dong

et al. 2012

J Wireless Com Network

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In this article, we first thoroughly analyze Wiener filter combined least squares based channel estimation (WF-LS) and then illustrate its limitation in high-speed mobile environments. Based on the analysis, we propose to combine WF with basis expansion model (BEM) based channel estimation to deal with channel estimation in various mobile environments, especially in high-speed cases. The expression for Wiener filter combined BEM based channel estimation (WF-BEM) is derived and the result explicitly considers the effect of intercarrier interference (ICI) that occurs in orthogonal frequency division multiplexing (OFDM) systems when operating under high mobility. The simulation results demonstrate that our proposed WF-BEM is better than WF-LS in time-varying channels, and the performance improvement is significant especially in fast time-varying channels.

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Section: Substituting (3) Into (2) and Lettingmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Channel estimation in OFDM systems operating under high mobility using Wiener filter combined basis expansion model

Zhong

Lei

Dong

et al. 2012

J Wireless Com Network

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show abstract

“…Note that the decoding of the received system information and receiver synchronization was assumed to be ideal. Figures 15,16,17 and 18 show the bit error rate (BER) performance versus the carrier-to-noise ratio (CNR) of transmission parameter Nos. 1-4 in Table 11 for 6 MHz bandwidth under AWGN, Brazil-D channel for 4K UHD ELP, and TU-6 channel for HD BLP.…”

Section: Available Transmission Parameters and Reception Performancesmentioning

confidence: 99%

A convergence broadcasting transmission of fixed 4K UHD and mobile HD services through a single terrestrial channel by employing FEF multiplexing technique in DVB-T2

Won

Lee

et al. 2016

Electr Eng

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Recently, a convergence broadcasting transmission for providing fixed 4K ultrahigh-definition (UHD) and mobile high-definition (HD) services through a single terrestrial channel is investigated by employing multiple-physical layer pipe (M-PLP) multiplexing and transmission technologies in digital video broadcasting (DVB)-second-generation terrestrial (T2) systems, and the scalable high-efficiency video coding (SHVC) technique. The M-PLP technique employs different code rates and constellation points for each layer of data and multiplexes differently encoded layers of data into a single frame, with no change of the inverse fast Fourier transform (IFFT) and cyclic prefix (CP). However, the IFFT size should be increased, and the CP size should be decreased for the 4K UHD layer while the opposite is true for the HD layer. Another aspect is that HD layer data are more important than 4K UHD layer data for reliable SHVC decoding, and thus the IFFT size should be decreased and the CP size should be increased for the HD layer to be robust to channel situations. In this paper, the possibility of a terrestrial fixed 4K UHD and mobile HD convergence broadcasting service through a single channel employing the future extension frame (FEF) multiplexing technique is examined. FEF multiplexing technology can be used to adjust the IFFT and CP size for each layer, whereas M-PLP multiplexing technology Department of Electronic Engineering, Konkuk University, Seoul, Republic of Korea cannot. We described the convergence broadcasting service scenario and proposed a transmission system structure by employing FEF and transmission technologies in DVB-T2 systems. Available transmission parameters are extracted and the reception performance of the transmission parameters is examined using computer simulations. From the results, for the 6 and 8 MHz bandwidths, reliable reception of both fixed 4K UHD and mobile HD layer data can be achieved under a static and fast fading multipath channel.

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“…Many studies on channel estimation (CE) can be found for OFDM signal transmission. Frequency-domain CE techniques based on the MMSE and least square (LS) criteria were proposed in [44]. It is shown in [44] that MMSE-CE is superior to LS-CE with respect to the estimation accuracy, while LS-CE has a lower complexity level.…”

Section: Channel Estimation (Ce)mentioning

confidence: 99%

“…This can be utilized by the delay time-domain windowing technique to improve the channel estimation accuracy [44].…”

Section: Channel Estimation (Ce)mentioning

confidence: 99%

Introduction of Frequency-Domain Signal Processing to Broadband Single-Carrier Transmissions in a Wireless Channel

Adachi

Tomeba

Takeda

2009

IEICE Trans. Commun.

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SUMMARYRecently, frequency-domain equalization (FDE) has been attracting much attention as a way to improve single-carrier (SC) signal transmission in a frequency-selective wireless channel. Since the SC signal spectrum is spread over the entire signal bandwidth, FDE can take advantage of channel frequency-selectivity and achieve the frequency diversity gain. SC with FDE is a promising wireless signal transmission technique. In this article, we review the pioneering research done on SC with FDE. The principles of simple one-tap FDE, channel estimation, and residual intersymbol interference (ISI) cancellation are presented. Multi-input/multioutput (MIMO) is an important technique to improve the transmission performance. Some of the studies on MIMO/SC with FDE are introduced.

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On channel estimation in OFDM systems

Cited by 1,292 publications

References 4 publications

Channel estimation in OFDM systems operating under high mobility using Wiener filter combined basis expansion model

Channel estimation in OFDM systems operating under high mobility using Wiener filter combined basis expansion model

A convergence broadcasting transmission of fixed 4K UHD and mobile HD services through a single terrestrial channel by employing FEF multiplexing technique in DVB-T2

Introduction of Frequency-Domain Signal Processing to Broadband Single-Carrier Transmissions in a Wireless Channel

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