Simplified MAP Estimator for OFDM Systems Under Fading

Çürük, Selva Muratoğlu; Tanik, Y.

doi:10.1109/vetecs.2007.648

Cited by 3 publications

(6 citation statements)

References 14 publications

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“…OFDM sistemlerinde altkanallar birbirleriyle oldukya ilintili oldugu iyin En BUyUk Sonsal (MAP) tabanh kestirim teknikleri En Biiytik Olabilirlik (ML) tabanh kestirirnlere gore daha iyi performans gosterirler. Bu yah�mada kablosuz kanallar iyin onerilen [12] (2) formundadrr. Burada toplanrr guriillli n ve kanal katsayIlan z, ortak degi�inti matrisleri Cn ve Cz olan slfrr ortalamah Gauss karma�lk rasgele siireylerinin omekleridir.…”

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“…Burada toplanrr guriillli n ve kanal katsayIlan z, ortak degi�inti matrisleri Cn ve Cz olan slfrr ortalamah Gauss karma�lk rasgele siireylerinin omekleridir. Bu durumda kanahn MAP kestirirni [12],…”

Section: Girisunclassified

“…Herhangi bir on bilgi olmadlgmda, A birirn matris olacagmdan, ML kestirirn ve kestirimin MSE'si [12]:…”

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“…Sadele�mi� MAP (SMAP) kestiricisi [12], kanahn Giiy Gecikme Profilinin Ustel oldugunu varsaymaktadrr:…”

Section: Girisunclassified

“…Bu durumda SMAP kestiricisinden elde edilen kestirirnler [12] Bir haberle�me sisteminde kanal kapasitesini smrrlayan arkaplan glirliltlislidlir. PLC kanallanndaki arkaplan glirUltlisUnUn GUy Spektrum Yogunlugu (PSD) frekans artttkya azalrr.…”

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Channel estimation for OFDM systems in Power Line Communication

Çürük

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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Section: Girisunclassified

“…Herhangi bir on bilgi olmadlgmda, A birirn matris olacagmdan, ML kestirirn ve kestirimin MSE'si [12]:…”

Section: Girisunclassified

“…Sadele�mi� MAP (SMAP) kestiricisi [12], kanahn Giiy Gecikme Profilinin Ustel oldugunu varsaymaktadrr:…”

Section: Girisunclassified

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Channel estimation for OFDM systems in Power Line Communication

Çürük

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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A simplified MAP channel estimator for OFDM systems under Rayleigh fading

Çürük

Tanik²

2010

Trans Emerging Tel Tech

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This paper presents a simplified Maximum A Posteriori (SMAP) channel estimator to be used in orthogonal frequency division multiplexing (OFDM) systems under the Rayleigh fading assumption for the subchannels, using a parametric correlation model and assuming that the channel is frequency selective and slowly time varying. Expressions for the mean-square error (MSE) of estimations are derived to evaluate the performance of the estimator. The relation between the correlation of subchannels taps and error variance is investigated. Dependencies of the proposed estimator's performance on the correlation parameter estimation error and signal-to-noise ratios (SNR) estimation error are analysed. We provide approximations on the estimator algorithms in order to make the estimator practical. The simulations done using measured channel data show that the proposed estimator with approximations operates satisfactorily with negligible loss in performance. Finally, we investigate the symbol error rate (SER) performance of an OFDM system using quadrature phaseshift keying (QPSK) modulation, based on channel estimation modes (a) training sequence (b) decision feedback and (c) pilot subcarriers. The results have indicated that the proposed estimator performance is always better than maximum likelihood (ML) estimator, and as the subchannel correlation increases (large number of subcarriers) the performance comes very close to that of exactly known channel case. Copyright Figure 7. SER versus Doppler frequency (Hz), N = 1024, training sequence and decision directed channel estimation, Monte Carlo simulation. SIMPLIFIED MAP CHANNEL ESTIMATOR 403 of f m = 40 Hz. Thus, channel correlation is E z nk · z * ml = J 0 (2π f m (k − l) T s )

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Simplified MAP Estimator for OFDM Systems

Çürük

Tanik

2007

2007 IEEE 15th Signal Processing and Communications Applications

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ÖzetçeBu bildiride, Dikgen Frekans Bölüşümlü Çoğullama (OFDM) sistemleri için sönümlü kanalı parametrik ilinti modelini kullanarak kestiren sadeleştirilmiş bir En Büyük Sonsal (MAP) kestiricisi sunulmaktadır. Çalışmada, çokyollu kanalın frekans seçici, zamanla değişmeyen ve Gauss olduğu varsayılmıştır. Önerilen MAP kestirici, kanalın ortak değişinti matrisini tek parametreyle modellediğinden diğer MAP kestiricilere göre daha kolay gerçeklenebilmektedir. Kestiricinin başarımını değerlendirmek amacıyla alt-kanallar arasındaki ilinti ile hata değişintisi arasındaki ilişki verilmiştir. Literatürden alınmış gerçek kanal verisi kullanılarak yapılan analizde başarımın iyi olduğu gösterilmiştir. Ayrıca, işaret gürültü oranının başarıma etkisi de incelenmiştir.

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Simplified MAP Estimator for OFDM Systems Under Fading

Cited by 3 publications

References 14 publications

Channel estimation for OFDM systems in Power Line Communication

Channel estimation for OFDM systems in Power Line Communication

A simplified MAP channel estimator for OFDM systems under Rayleigh fading

Simplified MAP Estimator for OFDM Systems

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