可见光多天线空分键控技术研究  

Study on Optical Multiple Active Antennas Space Shift Keying

作　　者：付红双[1] 朱义君[1] 蔡文炳[2] 

机构地区：[1]解放军信息工程大学信息系统工程学院,河南郑州450002 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《信号处理》2014年第7期842-847,共6页Journal of Signal Processing

基　　金：国家863计划(2013AA013603)

摘　　要：空分键控是一种新型的空间复用技术,每个时刻只有一个发送天线工作,携带信息的是天线的位置而非发送符号本身,因此该种方法频带利用率较低。为了提高频带利用率,基于广义空间调制的概念,提出了光多天线空分键控调制方法,这种调制方式中每个时刻有多个天线同时工作。首先建立了可见光通信中的多天线空分键控系统模型,并对其误码率性能进行了分析。由于通常天线组合数要多于实际需要的,为了减小由空间相关性带来的误码率性能上的下降,提出了一种基于最小欧氏距离最大化准则的天线选择算法以获得误码率性能的增益。最后通过蒙特卡罗仿真比较了有无天线选择的误码率性能,结果验证了该天线选择方法的有效性。Space shift keying （SSK）is a novel space multiplexing technique.Multiple transmit units exist while only one transmit unit is active at any given time instance in SSK.It is the position of transmit antennas not transmit symbols that covey information.Although SSK have many advantages,its spectral efficiency is low demonstrated by theory.For higher spectral efficiency,in this paper,we present optical multiple active antennas shift keying （MAA-SSK）as a new modulation scheme,which is based on the generalized spatial modulation （GSM）concept.In MAA-SSK,precoded sequences of symbols are transmitted using more than one antenna.In this paper MAA-SSK model is introduced and its bit error rate （BER） performance is analyzed.The available antenna groups are always more than actually needed,so the antenna selection method is put forward via maximizing the minimal euclidean distance involved minimizing the decreasing of BER perform-ance due to spatial correlation.The BER performance of MAA-SSK with and without antenna selection is simulated and compared,which demonstrates the validity of our antenna selection method.

关 键 词：可见光通信 光多天线空分键控 广义空间调制 天线选择 

分 类 号：TN929.12[电子电信—通信与信息系统]