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作 者:王海泉[1] 洪磊[1] 赵知劲[1] 赵宝峰[1]
机构地区:[1]杭州电子科技大学通信工程学院,杭州310018
出 处:《中国科学:信息科学》2012年第10期1293-1302,共10页Scientia Sinica(Informationis)
基 金:国家自然科学基金(批准号:60972049);浙江省自然科学基金(批准号:Y1090846);"钱江人才"计划项目;国家教育部留学归国人员科研启动基金资助项目
摘 要:针对发送方、接收方及中继都不知道信道信息的无线中继网络系统,已经证明,分布式差分空时码(distributed differential space time codes,DDSTC)是一种有效的编码与解码方式.本文针对DDSTC,首先基于接收到信号的密度函数的推导得到极大似然解码的具体公式,以弥补现有文献中的不足.其次,为了满足设计准则中提出的矩阵相互可交换的要求,我们通过利用Weyl交互律,得到一种新的DDSTC设计方法,并且将通过举例来说明我们所使用的方法比现有的方法更灵活,尤其是在高维酉矩阵以及中继数量比较多的情况下,更容易得到码本.For a relay network in which receivers and relays have channel state information, or partial channel information, distributed space time block codes (DSTBC) are proposed to achieve full diversity of the system, and different DSTBC are well-designed. For a relay network in which transmitters, receivers and relays do not have any channel state information, it is proved that distributed differential space time codes (DDSTC) are an efficient way to transmit signals for transmitters and to forward signals for relays, while some basic issues for this DDSTC are still unclear. To make up these issues, in this paper, firstly, ML-decoding is derived rigorously based on calculation of density function of received signals. Secondly, by using Weyl reciprocity appearing in Representation of Finite Groups, a new designing method of DDSTC is proposed to satisfy the commuting property of codes required in the designing criteria. Thirdly, designing examples are given based on this designing method and representations of finite groups. These examples show that the proposed methods are more flexible, and easier to get codes than existing methods, especially in a case with high-dimensional unitary matrices and a large number of relays. Furthermore, simulations show that our codes have better performances than existing codes.
关 键 词:分布式差分空时码 ML-解码 Weyl交互律 中继 无线网络 空时块状码 衰落信道
分 类 号:TN925[电子电信—通信与信息系统]
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