MMSE adaptive array utilizing guard interval in the OFDM systems

Hori, Shingo; Kikuma, Nobuyoshi; Inagaki, Nobuya

doi:10.1002/ecja.10121

Cited by 13 publications

(7 citation statements)

References 1 publication

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“…Then the optimal weight W opt is given by and R xx and r xr are In the optimization procedure considered here, the correlation matrix R xx and the correlation vector r xr are estimated as follows, using SMI (sampled matrix inversion) [12]:…”

Section: Optimization Proceduresmentioning

confidence: 99%

MMSE adaptive array suppressing only multipath waves with delay times beyond the guard interval for fixed reception in OFDM systems

Hori¹,

Kikuma

Inagaki

2004

Electron. Comm. Jpn. Pt. I

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SUMMARYIt is known that OFDM transmission systems give better performance than single-carrier systems in a multipath environment. However, the communication quality degrades rapidly when the delayed wave arrives beyond the guard interval. In order to solve this problem, various systems that try to suppress the undesired wave by using an adaptive array have been proposed. This paper considers fixed reception and investigates an MMSE adaptive array for OFDM that does not suppress waves arriving within the guard interval, only waves arriving beyond the guard interval. More precisely, the SMI optimization method is proposed in which a window function is used to extract only the wave components beyond the guard interval. In order to demonstrate the effectiveness of the proposed system, an evaluation is made by computer simulation. It is shown that the system operates well as an MMSE adaptive array in a fixed reception environment, exhibiting high suppression power for delayed waves beyond the guard interval.

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Section: Optimization Proceduresmentioning

confidence: 99%

MMSE adaptive array suppressing only multipath waves with delay times beyond the guard interval for fixed reception in OFDM systems

Hori¹,

Kikuma

Inagaki

2004

Electron. Comm. Jpn. Pt. I

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“…The third one is Minimum Mean Square Error (MMSE), and the weight coefficient vector W MMSE is expressed as follows [2],…”

Section: Implemented Algorithmsmentioning

confidence: 99%

Experimental study of adaptive array antenna system for ISDB-T high speed mobile reception

Tabata¹,

Asato²,

Pham

et al. 2007

2007 IEEE Antennas and Propagation Society International Symposium

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“…However, if delayed waves outside of the guard intervals are present, intersymbol interference and interchannel interference occurs, and the communication quality degrades. As a remedy, various methods have been proposed that use adaptive array antennas to suppress the interference [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Adaptive array suppressing intersymbol interference based on frequency spectrum in OFDM system

Higuchi

Sasaoka

2005

Electron. Comm. Jpn. Pt. I

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SUMMARYThe adaptive array is an effective measure in OFDM systems against intersymbol interference caused by delayed waves outside of the guard intervals. In this paper, we studied a technique that suppresses only delayed waves outside of the guard intervals and not delayed waves in the guard intervals by examining the temporal changes in the amplitude spectrum of the received OFDM signal caused by intersymbol interference. This technique is applicable if the signal points of the modulation of each subcarrier have a constant amplitude, and can be implemented by a relatively simple circuit because control is possible without the need for a known reference signal and estimation of the transmission path. Here, we proposed a method that compares in the time domain because the configuration is simpler. We also proposed a method that emphasizes the error portions with respect to a reference signal and improves the convergence speed as a measure against the slower convergence speed due to the interference components included in the standard signal. The simulation results verified the effective operation of the proposed method in a static multipath environment and a Rayleigh fading environment assumed in mobile communications.

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MMSE adaptive array utilizing guard interval in the OFDM systems

Cited by 13 publications

References 1 publication

MMSE adaptive array suppressing only multipath waves with delay times beyond the guard interval for fixed reception in OFDM systems

MMSE adaptive array suppressing only multipath waves with delay times beyond the guard interval for fixed reception in OFDM systems

Experimental study of adaptive array antenna system for ISDB-T high speed mobile reception

Adaptive array suppressing intersymbol interference based on frequency spectrum in OFDM system

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