摘要
从无线信道相互独立、序统计、发射天线选择和最大比发射(MRT)四方面研究基于预编码技术的Alamouti方案(ALS)多天线系统的性能。对各种情况下系统误码率,侧重于确切的理论解析式推导,同时也兼顾计算机实验的仿真方法。就系统每发射天线功率是否受限,讨论双发射天线的功率分配准则。研究结果表明:若发射端部分已知信道状态信息(CSI),将更多功率适当地分配给信道较佳的天线能提高系统性能;当无线通道相互独立时,预编码对系统性能没有改善;混合天线选择和预编码两技术,系统性能的改善明显;若全部已知CSI,发射机采用MRT技术自适应地分配发射天线功率,性能也能得到较好改善。
The paper introduces pre-coding technique to strengthen the error performance of Alamouti scheme（ALS） system with muhiple input antennas and multiple output antennas（MIMO）,in which includes mutually independent channels, order statistics channels, transmit antennas selection（TAS）and maximum ratio transmission（MRT）. We emphasis on deriving theoretically analytic expressions of system error rate and accompany with computer simulation experiments. Power allocation criterions with the double transmit antenna system are discussed whether single transmit antenna power is limited. The results show that more power allocated properly to the best channel transmit antenna can increase system performance if the transmitter knows partly channel state information（CSI）. The pre-coding can not enhance system performance when wireless channels are mutually independent. Combining TAS with pre-coding will improve system performance obviously. If we know CSI at the transmitter, the system performance can also be improved well by employing MRT technique, in which the transmitter allocates adaptively to transmit power of antennas.
出处
《电波科学学报》
EI
CSCD
北大核心
2010年第3期445-452,共8页
Chinese Journal of Radio Science
基金
福建省自然科学基金(No.2009JD1292)
福建省教育厅项目(No.JA08142
No.JB07133)
