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  • 熊兴中,骆忠强,郝黎宏.OFDM-IDMA系统的迭代频偏估计及补偿[J].电讯技术,2012,52(10): - .    [点击复制]
  • XIONG Xing-zhong,LUO Zhong-qiang,HAO Li-hong.Frequency offset estimation and compensation based on iterative detection for OFDM-IDMA systems[J].,2012,52(10): - .   [点击复制]
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OFDM-IDMA系统的迭代频偏估计及补偿
熊兴中,骆忠强,郝黎宏
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(四川理工学院 自动化与电子信息学院,四川 自贡 643000;中国西南电子技术研究所,成都 610036)
摘要:
针对OFDMIDMA系统中载波频偏(CFO)带来的子载波之间的干扰问题,提出了在各用户具有 相同频偏下的联合逐码片(CBC)迭代检测的载波同步方法。该方法利用迭代检测中的外信息 重构的信号作为虚拟的训练序列进行频域频偏估计,同时进行相应的时域频偏补偿。理论分 析及实验仿真结果表明:基于逐码片迭代检测的OFDMIDMA系统的频偏估计和补偿方法能 够使系统性能接近无频偏时的性能。
关键词:  正交频分复用  交织分多址  载波频偏  逐码片迭代检测
DOI:
基金项目:国家自然科学基金资助项目(60872030);四川省杰出青年基金 项目(2011JQ0034);四川理工学院人才引进项目(2010XJKRL014)
Frequency offset estimation and compensation based on iterative detection for OFDM-IDMA systems
XIONG Xing-zhong,LUO Zhong-qiang,HAO Li-hong
()
Abstract:
To solve the intercarrier interference(ICI) of OFDMIDMA systems due to the c arrier frequency offset(CFO), a carrier sync hronization method based on chipbychip(CBC) iterative detection is proposed. This method employs the reconstructed signal of exterior information as virtual training sequ ence to estimate the residual frequency offset in frequency domain, and compensa tes corresponding loss of performance in time domain. Theoretical analysis and s imulation results show that the performance of OFDMIDMA systems with CFO emplo ying carrier synchronization method based on CBC iterative detection is close to that of OFDMIDMA systems without CFO.
Key words:  orthogonal frequency division multiplexing  interleave division multiple access  carrier frequency offset  chip by chip iterative detection
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