IQ Imbalance Compensation Scheme in the Presence of Frequency Offset and Dynamic DC Offset for a Direct Conversion Receiver

被引：36

作者：

Inamori, Mamiko ^{[1
]}

Bostamam, Anas M. ^{[1
]}

Sanada, Yukitoshi ^{[1
]}

Minami, Hideki ^{[2
]}

机构：

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

[2] Sony Corp, Atsugi, Kanagawa 2430014, Japan

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2009年 / 8卷 / 05期

关键词：

Direct conversion; OFDM; DC offset; frequency offset; IQ imbalance; training sequence;

D O I：

10.1109/TWC.2009.080139

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：

A direct conversion architecture reduces the cost and power consumption of a receiver. However, a direct conversion receiver may suffer from direct current (DC) offset, frequency offset, and IQ imbalance. This paper presents an IQ imbalance estimation scheme for orthogonal frequency division multiplexing (OFDM) direct conversion receivers. The proposed IQ imbalance estimation scheme operates in the presence of dynamic DC offset and frequency offset. The proposed scheme calculates IQ imbalance from a simple equation. It employs the knowledge of the preamble symbols of the IEEE 802.11 a/g standards, while it does not require the impulse response of the channel. Numerical results obtained through computer simulation show that the bit error rate (BER) performance for the proposed IQ imbalance estimation scheme has a degradation of about 4dB with a large DC offset, frequency offset, and IQ imbalance.

引用

页码：2214 / 2220

页数：7

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