Frequency offset estimation scheme in the presence of time-varying DC offset for OFDM direct conversion receivers

被引：15

作者：

Inamori, Mamiko ^{[1
]}

Bostamam, Anas Muhamad

Sanada, Yukitoshi

Minami, Hideki

机构：

[1] Keio Univ, Dept Elect & Elect Engn, Yokohama, Kanagawa 2238522, Japan

[2] Keio Univ, Dept Elect & Elect Engn, Atsugi, Kanagawa 2430014, Japan

来源：

IEICE TRANSACTIONS ON COMMUNICATIONS | 2007年 / E90B卷 / 10期

关键词：

direct conversion; OFDM; DC offset; frequency offset; training sequence;

D O I：

10.1093/ietcom/e90-b.10.2884

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents a frequency offset estimation scheme for Orthogonal Frequency Division Multiplex (OFDM) direct conversion receivers. The key idea is to use a differential filter for reduction of DC offset. Frequency offset is estimated in the presence of time-varying DC offset. In order to overcome the varying DC levels under automatic gain control (AGC) circuits, a threshold level is set for the output of the differential filter. The proposed compensation scheme offers superior frequency offset estimation when compared with a conventional scheme with a high pass filter.

引用

页码：2884 / 2890

页数：7

共 17 条

[1] Direct-conversion radio transceivers for digital communications [J].

Abidi, AA .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1995, 30 (12) :1399-1410

[2]

Chen WZ, 2005, IEEE RAD FREQ INTEGR, P201

[3] DC offset and IM2 removal in direct conversion receivers [J].

Faulkner, M .

IEE PROCEEDINGS-COMMUNICATIONS, 2002, 149 (03) :179-184

[4] A single-chip 802.11a MAC/PHY with a 32-b RISC processor [J].

Fujisawa, T ;

Hasegawa, J ;

Tsuchie, K ;

Shiozawa, T ;

Fujita, T ;

Saito, T ;

Unekawa, Y .

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2003, 38 (11) :2001-2009

[5] Joint ML estimation of carrier frequency, channel, I/Q mismatch, and DC offset in communication receivers [J].

Gil, GT ;

Sohn, IH ;

Park, JK ;

Lee, YH .

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2005, 54 (01) :338-349

[6]

HO CK, 2003, P ICC 03 MAY, V3, P2051

[7]

Hui D, 2002, IEEE VTS VEH TECHNOL, P161, DOI 10.1109/VETECF.2002.1040323

[8]

*IEEE, 80122 IEEE

[9]

LIU T, 2000, P ISSCC FEB, P320

[10]

MEYER RG, 1997, P ISSCC 97 FEB, P310

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