第 39 卷第4 期 电子科技大学学报 Vo l . 3 9 N o . 4
2010年7月 Journal of University of Electronic Science and Technology of China Jul. 2010
分布式
V-BLAST OFDM
中存在多个频偏时的信号检测
邓 凯，唐友喜
(电子科技大学通信抗干扰技术国家级重点实验室 成都 610054)
【摘要】在采用分布式发射天线的垂直贝尔实验室分层空时结构
(V-BLAST)
正交频分复用
(OFDM)
系统中，由于各发射天
线与接收机之间的载波频偏
(CFO)
均可能不同，因此必须在信号检测中考虑多个频偏的影响。该文利用迫零
(ZF)
检测的固有特
性，提出一种适用于低时延扩展多径信道的低复杂度频偏校正方法；再针对其不足，结合传统频偏校正方法，提出了采用两
次频偏校正的基于迫零的信号检测方法。仿真结果表明，在低时延扩展信道下，该文所提频偏校正方法能有效消除多个频偏
对系统性能的影响；且在时延扩展较大时，采用两次频偏校正的信号检测方法能进一步改善系统性能。
关键词载波频偏
;
校正
;
信号检测
;
分布式发射天线
;V-BLAST;
迫零
中图分类号
TN914
文献标识码
A doi:10.3969/j.issn.1001-0548.2010.04.008
Detection in Distributed V-BLAST OFDM with
Multi
p
le Fre
q
uenc
y
Offsets
DENG Kai and TANG You-xi
(National Key Lab oratory of Science and Technology on Communications, University of Electronic Science and Technology of China Chengdu 610054)
Abstract In vertical Bell labs layered space-time (V-BLAST) orthogonal frequency division multiplexing
(OFDM) systems with distributed transmit antennas, since the carrier frequency offsets (CFOs) between the
receiver and each transmit antenna are possibly different, the effects of multiple CFOs should be taken into account
in detection. This paper first proposes a low-complexity CFO correction method for low delay spread channels by
exploiting the underlying characteristics of zero-forcing (ZF) detection; and then proposes a ZF based detection
method involving two CFO correction processes by combining the proposed CFO correction method with the
conventional one. Simulation results show that the proposed CFO correction method can effectively eliminate the
effects of multiple CFOs in low delay spread channels; while in channels with larger delay spread the proposed
detection method involving two CFO correction processes can further improve the system performance.
Key words carrier frequency offsets; correction; detection; distributed transmit antennas; V-BLAST;
zero-forcing
收稿日期：
2008 12 29; 修回日期：2009 03 24
基金项目：国家自然科学基金(60832007，60572090，60602009，60902027)
作者简介：邓 凯(1980 )，男，博士，主要从事无线通信中的同步与检测技术方面的研究.
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