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1. (WO2014205893) RECEIVING END EQUALIZATION METHOD AND SYSTEM BASED ON FREQUENCY DOMAIN CHANNEL ESTIMATION
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Pub. No.:
WO/2014/205893
International Application No.:
PCT/CN2013/081341
Publication Date:
31.12.2014
International Filing Date:
13.08.2013
IPC:
H04L 25/03
(2006.01)
H
ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25
Baseband systems
02
Details
03
Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
Applicants:
PEKING UNIVERSITY
[CN/CN]; No. 5 Yiheyuan Road, Haidian District Beijing 100871 (CN)
Inventors:
ZHANG, Fan
; (CN).
ZHENG, Zhennan
; (CN).
CHEN, Zhangyuan
; (CN)
Agent:
BEIJING JOYSHINE INTELLECTUAL PROPERTY OFFICE
; Room 1316-1317, Left Bank Community Building No. 68 Beisihuanxilu Road, Haidian District Beijing 100080 (CN)
Priority Data:
201310263522.6
27.06.2013
CN
Title
(EN)
RECEIVING END EQUALIZATION METHOD AND SYSTEM BASED ON FREQUENCY DOMAIN CHANNEL ESTIMATION
(FR)
PROCÉDÉ ET SYSTÈME D'ÉGALISATION D'UNE EXTRÉMITÉ RÉCEPTRICE SUR LA BASE D'UNE ESTIMATION DE CANAL DANS LE DOMAINE FRÉQUENTIEL
(ZH)
一种基于频域信道估计的接收端均衡方法和系统
Abstract:
(EN)
The present invention relates to a receiving end equalization method and system based on frequency domain channel estimation. The method comprises: first, inserting a training sequence with a flat spectrum characteristic into a transmission end signal; then, transforming the received training sequence into a frequency domain at a receiving end with a fast Fourier transform; dividing by a corresponding ideal frequency spectrum to obtain a transfer function of a channel, and then taking the reciprocal of the transfer function and transforming same into a time domain with an inverse fast Fourier transform, so as to obtain a tap coefficient of a time domain filter; and after this, filtering a data signal in the time domain with the tap coefficient of the time domain filter, so as to realize signal equalization. The system contains various modules for realizing the corresponding functions. The present invention combines the characteristics of time domain equalization, without inserting a cyclic prefix/suffix causing an overhead, and simple channel estimation of frequency domain equalization, and can effectively conduct phase noise compensation in the case where chromatic dispersion of an optical fibre is small or is compensated by means of other algorithms, and the algorithm complexity is small, which can save calculation time.
(FR)
La présente invention concerne un procédé et un système d'égalisation d'une extrémité réceptrice sur la base d'une estimation de canal dans le domaine fréquentiel. Le procédé consiste à insérer tout d'abord une séquence d'apprentissage ayant une caractéristique de spectre plane dans un signal d'extrémité de transmission ; puis à transformer la séquence d'apprentissage reçue en un domaine fréquentiel à une extrémité réceptrice au moyen d'une transformée de Fourier rapide ; à effectuer une division par un spectre de fréquences idéal correspondant afin d'obtenir une fonction de transfert d'un canal, puis à déterminer l'inverse de la fonction de transfert et à transformer celle-ci en un domaine temporel au moyen d'une transformée de Fourier rapide inverse, afin d'obtenir un coefficient de prise d'un filtre de domaine temporel ; à filtrer ensuite un signal de données dans le domaine temporel en utilisant le coefficient de prise du filtre du domaine temporel de manière à effectuer une égalisation du signal. Le système contient divers modules permettant de mettre en œuvre les fonctions correspondantes. La présente invention combine les caractéristiques d'une égalisation dans le domaine temporel, sans insérer de préfixe/suffixe cyclique conduisant à un surdébit, et effectue une estimation de canal simple pour une égalisation de domaine fréquentiel, et permet d'effectuer une compensation efficace du bruit de phase dans le cas où la dispersion chromatique d'une fibre optique est faible ou de la compenser au moyen d'autres algorithmes, la complexité des algorithmes étant faible, cela permettant d'effectuer des économies de temps de calcul.
(ZH)
本发明涉及一种基于频域信道估计的接收端均衡方法及系统,该方法首先在发射端信号中插入具有平坦的频谱特性的训练序列,然后在接收端用快速傅里叶变换将接收的训练序列变换到频域,通过与对应的理想频谱相除得到信道的传递函数,然后取该传递函数的倒数并将其用快速傅里叶反变换变换到时域,得到时域滤波器抽头系数;之后利用时域滤波器抽头系数在时域对数据信号进行滤波,实现信号均衡。该系统包含实现上述相应功能的各个模块。本发明结合了时域均衡的不插入循环前缀/后缀造成开销和频域均衡的信道估计简单的特点,能够在光纤色散较小或色散由其他算法补偿的情形下,有效地进行相位噪声补偿,且算法复杂度小,能够节省计算时间。
Designated States:
AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG).
Publication Language:
Chinese (
ZH
)
Filing Language:
Chinese (
ZH
)