Linear Prediction Based Semi-Blind Channel Estimation for MIMO-OFDM System

Wan, Feng; Zhu, Wei-Ping; Swamy, M.N.S.

doi:10.1109/iscas.2007.378162

Cited by 18 publications

(6 citation statements)

References 10 publications

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“…However, compared to the direct pseudo inversion ofỸỸ used in (35) and in most of conventional LP based MIMO blind equalizers [5], [11], the QR-decomposition based method in (39) shows much better robustness against channel order overestimation, as demonstrated in our simulation results later. To emphasize the proposed MLP based channel estimation algorithm using the QR-decomposition based LPEFs, we refer to it as the "MLP-QR" based method in the paper.…”

Section: Semiblind Channel Estimationmentioning

confidence: 65%

“…To avoid this problem, in this section we present an alternative approach to fulfill the LPEFs in (9) and (21) based on QRdecomposition. It is worthwhile to mention that this channel order overestimation problem never occurs for OFDM systems with sufficient guard interval, as reported in [3] and [5]. Let us illustrate the proposed QR-decomposition method by considering the LP problem in (10) for = 0.…”

Section: Semiblind Channel Estimationmentioning

confidence: 93%

“…For MIMO-OFDM or multiuser OFDM systems where usually a large amount of channel coefficients are involved, effective blind and semiblind channel estimation becomes much more challenging and has attracted much attention recently [2]- [5]. Specifically, the semiblind channel estimation methods in [3] and [4] are developed for MIMO-OFDM systems in which the guard interval between successive transmitted data blocks is larger than the length of multipath channels.…”

Section: Introductionmentioning

confidence: 99%

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Linear prediction based semiblind channel estimation for multiuser OFDM with insufficient guard interval

Chang

Chi

2009

IEEE Trans. Wireless Commun.

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To meet the demand of high data rate transmissions for multimedia wireless communications, orthogonal frequency division multiplexing (OFDM) systems in conjunction with multiple-input multiple-output (MIMO) signal processing have been considered one of the central techniques in advanced wireless communications. In the paper, two semiblind channel estimation algorithms are proposed for the uplink multiuser OFDM systems with insufficient guard interval, in contrast to sufficient guard interval assumed in most of the prior works. A zero-padding OFDM system, which zero-pads rather than cyclicly prefixing each block, is considered in this paper. By utilizing the relation between the linear prediction error filters (LPEFs) of the received signal with multiple prediction orders and the transmitted data sequence, the first proposed algorithm, namely the multistage LP (MLP) based algorithm, can estimate the MIMO channel coefficients, with only a single pilot OFDM block used. To reduce the sensitivity of the proposed algorithms to the channel order overestimation, it is proposed to implement the LPEFs with a QR-decomposition based approach. This QRdecomposition based approach alternatively computes the LPEFs without direct inversion of the received signal correlation matrix, thus exhibiting robustness against channel order overestimation. Some simulation results are presented to demonstrate the effectiveness and robustness of the proposed algorithms.Index Terms-Orthogonal frequency-division multiplexing (OFDM), multiple-input multiple-output (MIMO), blind channel estimation, linear prediction (LP), QR decomposition.

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Section: Semiblind Channel Estimationmentioning

confidence: 65%

Section: Semiblind Channel Estimationmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Linear prediction based semiblind channel estimation for multiuser OFDM with insufficient guard interval

Chang

Chi

2009

IEEE Trans. Wireless Commun.

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“…The objective of this paper is to investigate the performance of the MB-OFDM based PHY layer over IEEE UWB channel models [13] and to make comparison with a competitive pulsed-MB-OFDM approach [12,14,15]. Optimal choice of some critical system parameters like Cyclic Prefix (CP) length and number of subcarriers (IFFT/FFT size) is also discussed.…”

Section: Introductionmentioning

confidence: 99%

Performance of pulsed OFDM systems for UWB communication

2011

2011 International Conference on Electric Information and Control Engineering

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This A multi-band orthogonal frequency division multiplexing (OFDM) UWB system is the new proposal for the IEEE 802.15.3a standard for wireless high bit-rate personal area networks. Pulsed OFDM is an enhancement to the multi-band OFDM system that offers better performance with lower complexity and correspondingly reduced power consumption. In this paper, the implementation issues and pipeline structures of a pulsed OFDM transmitter are presented. In particular, architectural features of the system and its components are described and analyzed.

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“…In [16] the prediction error of the received signal is minimized to obtain blind and semi-blind channel estimate, the technique involves matrix decomposition and general matrix inverse. In study [17], a combination of pilotbased LS and blind linear prediction of the received signal is proposed form MIMO channel estimation. While in [18] blind and semi-blind estimate of the channel are proposed based on the linear prediction of the received signal which involves matrix decomposition and inversion.…”

mentioning

confidence: 99%

Pilot based channel estimation improvement in orthogonal frequency-division multiplexing systems using linear predictive coding

Saleh Idan,

Al-Haddad

2024

IJECE

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Pilot based least square (LS) channel estimation is a commonly used channel estimation technique in orthogonal frequency-division multiplexing based systems due to its simplicity. However, LS estimation does not handle the noise effect and hence suffers from performance degradation. Since the channel coefficients are correlated in time and hence show a slower variation than the noise, it is possible to encode the channel using linear predictive coding (LPC) without the noise. In this work, the channel is estimated from the pilots using LS estimation and in a second step the channel’s LS estimated is encoded as LPC coefficients to produce an improved channel estimation. The estimation technique is simulated for space-time block coding (STBC) based orthogonal frequency-division multiplexing (OFDM) system and the bit error rate (BER) curves show improvement of the LPC estimation over the LS estimation of the channel.

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Linear Prediction Based Semi-Blind Channel Estimation for MIMO-OFDM System

Cited by 18 publications

References 10 publications

Linear prediction based semiblind channel estimation for multiuser OFDM with insufficient guard interval

Linear prediction based semiblind channel estimation for multiuser OFDM with insufficient guard interval

Performance of pulsed OFDM systems for UWB communication

Pilot based channel estimation improvement in orthogonal frequency-division multiplexing systems using linear predictive coding

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