CN101286775A - 采用增强信号检测的多天线空间复用*** - Google Patents
采用增强信号检测的多天线空间复用*** Download PDFInfo
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Abstract
一种采用增强信号检测的多天线空间复用***,包括:编码调制模块(101),用于对比特信息进行编码与调制;信号发送模块(102),用于对已调信号进行发送;接收信号模块(201),进行信号接收;信号形式变换模块(202),用于对信道矩阵H与接收信号向量r进行形式变换;信号检测模块(203),用于对接收信号进行检测;信号重构模块(204)用于对203模块的检测结果进行重构,得到已检测信号;解调译码模块(205),用于对204模块的输出进行解调译码,输出比特信息。相比于ZF及ZF SIC检测方法,本发明***的BER及FER性能提升显著。考虑到本发明***的性能提升及实现复杂度,相比于以上检测方法,本发明的***更为优越。
Description
技术领域
本发明涉及多天线通信***中的信息传输领域,特别涉及多天线信号的发送与检测技术。
背景技术
利用多天线空间复用BLAST技术,可以在有限的频谱资源条件下,有效提升数据传输速率。
现有BLAST检测算法分为线性检测(包括迫零检测ZF、最小均方误差检测MMSE等)与非线性检测(包括迫零加干扰抵消检测ZF-SIC、最小均方误差加干扰抵消检测MMSE-SIC等)。
线性检测方法实现相对简单,但性能相对较差。相比于线性检测,非线性检测方法可有效提升***性能,但迭代干扰抵消带来的复杂度的显著提升是将非线性检测付诸实际的难点所在。
以下对线性与非线性BLAST检测算法做简要说明。
线性检测算法
设接收信号为
r=Hs+n,
其中,H为N×M信道矩阵,s为M维发送信号矢量,r为N维接收信号矢量,n为N维独立高斯白噪声矢量,M与N分别为***发送与接收天线数目。
对于ZF迫零检测算法,
对于MMSE最小均方误差检测算法,
非线性检测算法
相比于线性检测,非线性技术以运算复杂度的增加为代价,可有效提升***性能。
以下简要说明BLAST非线性检测算法中的顺序干扰抵消算法。该算法的基本原理是在检测当前信号的过程中将来自于已检测成分的干扰去掉,从而减小干扰对较小信噪比数据的影响,该原理类似于判决反馈均衡。
以下说明检测过程:
对于ZF-SIC检测器,定义
对于MMSE-SIC检测器,定义
进行以下过程一,可以得到一个判决信号:
过程一:
其中,k1,k2,…,kM为检测过程中对发送天线的排序。
然后,进行以下过程二,将已检测信号的影响从接收信号中减去,并确定新的伪逆阵,确定新的判决顺序。
过程二:
这样形成了一个循环过程,循环进行过程一及过程二,直到i=M。至此,所有信号均判决完毕,循环过程结束。
BLAST线性检测方法实现相对简单,但性能相对较差。相比于线性检测,非线性检测方法可有效提升***性能,但迭代干扰抵消带来的复杂度的显著提升是将非线性检测付诸实际的难点所在。
发明内容
本发明提供了一种采用增强信号检测的BLAST***。该***复杂度与采用传统线性检测器的BLAST***接近,但性能优于采用顺序干扰抵消非线性检测器的BLAST***。
为实现上述目的,一种采用增强信号检测的多天线空间复用***,包括:
编码调制模块,用于对比特信息进行编码与调制;
信号发送模块,用于对已调信号进行发送;
接收信号模块,进行信号接收;
信号形式变换模块,用于对信道矩阵H与接收信号向量r进行形式变换;
信号检测模块,用于对接收信号进行检测;
解调译码模块,用于对204模块的输出进行解调译码,输出比特信息。
相比于ZF及ZF SIC检测方法,本发明***的BER及FER性能提升显著。考虑到本发明***的性能提升及实现复杂度,相比于以上检测方法,本发明的***更为优越。
附图说明
图1是本发明提出***发送端***架构;
图2是本发明提出***接收端***架构与信号流程;
图3是实施例1误帧率(FER)性能;
图4是误比特率(BER)性能。
具体实施方式
本发明提出***的架构与信号流程如图1及图2所示。
以下对该***架构加以说明:
编码调制模块:该模块对比特信息进行编码与调制。
信号发送模块:该模块对已调信号进行发送。该模块遵循以下准则:待发送信号为s,设准静态衰落信道H在相邻时间块T1与T2内保持恒定。在时间块T1内,发送信号 在时间块T2内,发送信号 其中Re(s)表示复信号实部,Im(s)表示复信号虚部。
接收信号模块:该模块进行信号接收,
信号形式变换模块:该模块对信道矩阵H与接收信号向量r进行形式变换:
解调译码模块:该模块对已检测信号进行解调译码,输出比特信息。
由以上过程,在该***进行信号检测的过程中,将伪逆检测矩阵由传统检测算法中的退化为及这将极大减少检测过程中的噪声抬升,从而实现***性能的显著提升。同时该***的复杂度相对于传统线性检测算法没有明显提升,且复杂度远低于顺序干扰抵消非线性检测算法。
以下对本发明提出***的信号流程合理性予以证明:
在以下证明过程中,[]+表示矩阵伪逆,[]H表示矩阵转置共轭。
对式(1)进行等价变换
则
以下证明
由式(9)及式(10),式(8)得证。
则
由式(8)及式(11),可以得到
同理可得
则已检测信号
本实施例采用了4发4收天线组成的多天线BLAST通信***。信道为准静态平坦瑞利衰落信道。在连续时间块T1及T2内,设信道保持恒定。在该实施例内,分别对本发明所提***、采用ZF检测及ZF SIC检测器的BLAST***性能进行了仿真。为保证性能对比的公平性,在发送端,本发明所提***采用16QAM调制,ZF及ZF SIC算法发送端均采用QPSK调制。仿真中,所有算法均采用1/3Turbo编译码。
Claims (6)
2.按权利要求1所述的***,其特征在于所述信号发送模块发送信号遵循以下准则:
待发送信号为s,设准静态衰落信道H在相邻时间块T1与T2内保持恒定;
在时间块T1内,发送信号
在时间块T2内,发送信号 其中Re(s)表示复信号实部,Im(s)表示复信号虚部。
3.按权利要求1所述的***,其特征在于对信道矩阵H和接收信号向量r进行变换的规则为:
5.按权利要求1所述的方法,其特征在于所述信号重构模块对信号检测结果进行重构的规则为:
6.按权利要求1所述的通信***,其特征在于所述天线为多发多收天线。
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CNA2007100958913A CN101286775A (zh) | 2007-04-12 | 2007-04-12 | 采用增强信号检测的多天线空间复用*** |
KR1020097015681A KR101413929B1 (ko) | 2007-04-12 | 2008-04-11 | 향상 신호 검출을 이용한 다중 안테나 공간 다중화 시스템 및 그 방법 |
JP2009554460A JP5037634B2 (ja) | 2007-04-12 | 2008-04-11 | 向上信号検出を使用する多重アンテナ空間多重化システム |
PCT/KR2008/002054 WO2008127035A1 (en) | 2007-04-12 | 2008-04-11 | Multiple-antenna space multiplexing system using enhancement signal detection |
EP20080741299 EP2132893B1 (en) | 2007-04-12 | 2008-04-11 | Multiple-antenna space multiplexing system using enhancement signal detection |
US12/527,644 US8199863B2 (en) | 2007-04-12 | 2008-04-11 | Multiple-antenna space multiplexing system using enhancement signal detection and method thereof |
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JP (1) | JP5037634B2 (zh) |
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CN103199964B (zh) * | 2008-03-31 | 2015-10-21 | 高通股份有限公司 | 可靠地发送控制信号的方法 |
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US7542743B2 (en) * | 2005-09-30 | 2009-06-02 | Broadcom Corporation | Maximum likelihood detection for MIMO receivers |
JP4680036B2 (ja) * | 2005-11-09 | 2011-05-11 | 独立行政法人情報通信研究機構 | 受信装置および受信方法 |
FI20075083A0 (fi) * | 2007-02-06 | 2007-02-06 | Nokia Corp | Ilmaisumenetelmä ja -laite monivuo-MIMOa varten |
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JP2010521919A (ja) | 2010-06-24 |
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US8199863B2 (en) | 2012-06-12 |
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