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1. JP2004080731 - OFDM RECEIVING SYSTEM AND OFDM SIGNAL CORRECTING METHOD

Office
Japon
Numéro de la demande 2003001438
Date de la demande 07.01.2003
Numéro de publication 2004080731
Date de publication 11.03.2004
Numéro de délivrance 3715282
Date de délivrance 02.09.2005
Type de publication B2
CIB
H04J 11/00
HÉLECTRICITÉ
04TECHNIQUE DE LA COMMUNICATION ÉLECTRIQUE
JCOMMUNICATION MULTIPLEX
11Systèmes multiplex orthogonaux
CPC
H04L 27/2614
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
26Systems using multi-frequency codes
2601Multicarrier modulation systems
2614Peak power aspects
H04L 27/2647
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
26Systems using multi-frequency codes
2601Multicarrier modulation systems
2647Arrangements specific to the receiver only
H04L 2025/03414
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
0335characterised by the type of transmission
03375Passband transmission
03414Multicarrier
H04L 27/26526
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
26Systems using multi-frequency codes
2601Multicarrier modulation systems
2647Arrangements specific to the receiver only
2649Demodulators
26524Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
26526with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
Déposants MATSUSHITA ELECTRIC IND CO LTD
パナソニック株式会社
Inventeurs UESUGI MITSURU
上杉 充
OTA EIJI
太田 英司
Mandataires 鷲田 公一
Données relatives à la priorité 2002180204 20.06.2002 JP
Titre
(EN) OFDM RECEIVING SYSTEM AND OFDM SIGNAL CORRECTING METHOD
(JA) OFDM受信装置及びOFDM信号の補正方法
Abrégé
(EN)

PROBLEM TO BE SOLVED: To obtain high-quality receiving signals by correcting precisely distortion even if in OFDM signals distortion is contained is resulting from, for example, peak clip processing or the like.

SOLUTION: A tap selecting section 502 divides the sampling signals (r) (i, 0) to (r) (i, 7) obtained from received OFDM signals into the sampling signals targeted for correction and those not targeted for correction. The sampling signals targeted for correction are delivered to a FIR filter 503, while those not targeted for correction are delivered to a FFT 505. The FIR filter 503 defines the sampling signals as variable gains and known factors of the Fourier transform as input. An adaptation algorithm section 511 makes sampling signal values containing distortion components that are the variable gains of the FIR filter 503 converge into optimum values so as to decrease error values (e) (i, k) caused by distortion.

COPYRIGHT: (C)2004,JPO


(JA)

【課題】OFDM信号に例えばピーククリップ処理等に基づく歪みが含まれている場合でも、この歪みを的確に補正して品質の良い受信信号を得ること。
【解決手段】タップ選択部502は、受信OFDM信号から得られたサンプリング信号r(i,0)〜r(i,7)を補正対象のサンプリング信号と補正対象でないサンプリング信号に分け、補正対象のサンプリング信号をFIRフィルタ503に送出すると共に、補正対象でないサンプリング信号をFFT505に送出する。FIRフィルタ503は、サンプリング信号を可変ゲインとすると共にフーリエ変換の既知の係数を入力とする。適応アルゴリズム部511は、FIRフィルタ503の可変ゲインである歪み成分が含まれたサンプリング信号の値を、歪みによる誤差値e(i,k)が小さくなるように最適値に収束させる。
【選択図】   図5