標題: Estimation of carrier frequency offset with I/Q mismatch using pseudo offset injection in OFDM systems
作者: Sun, Ming-Fu
Yu, Jui-Yuan
Hsu, Temg-Yin
資訊工程學系
Department of Computer Science
關鍵字: carrier frequency offset (CFO);direct conversion;I/Q mismatch;orthogonal frequency-division multiplexing (OFDM)
公開日期: 1-Apr-2008
摘要: This work presents a novel carrier frequency offset (CFO) estimation algorithm, based on pseudo-CFO (P-CFO), to estimate the CFO value under the conditions of I/Q mismatch for direct conversion structures with 2-dB gain error and 20-deg. phase error in frequency selective fading channels. To circumvent CFO with I/Q mismatch, the proposed P-CFO algorithm rotates three training symbols by adding extra frequency offset into the received sequence to improve CFO estimation. Simulation results indicate that the estimation error of the proposed method is about 0.3 ppm, which is lower than those of two-repeat preamble-based methods. Additionally, the proposed P-CFO algorithm is compatible with the conventional method, and is appropriate for SoC implementation. The proposed scheme is implemented as part of an orthogonal frequency-division multiplexing wireless receiver fabricated in a 0.13-mu m CMOS process with 3.3 x 0.4 mm(2) core area and 10-mW power consumption at 54-Mbits/s data rate.
URI: http://dx.doi.org/10.1109/TCSI.2008.916426
http://hdl.handle.net/11536/29609
ISSN: 1549-8328
DOI: 10.1109/TCSI.2008.916426
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume: 55
Issue: 3
起始頁: 943
結束頁: 952
Appears in Collections:Conferences Paper


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