摘要: |
针对OFDMIDMA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OFDMIDMA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: |
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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) |
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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 intercarrier interference(ICI) of OFDMIDMA systems due to the c
arrier frequency offset(CFO), a carrier sync
hronization method based on chipbychip(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 OFDMIDMA systems with CFO emplo
ying carrier synchronization method based on CBC iterative detection is close to that
of OFDMIDMA systems without CFO. |
Key words: orthogonal frequency division multiplexing interleave division multiple access carrier frequency offset chip by chip iterative detection |