CAJ | 학술논문

多天线技术引入超宽带系统是提高传输质量和抗干扰能力、降低误比特率(BER)的有效方法之一。然而,随着天线数目的增加,硬件成本也随之提高。天线选择技术和优化发射功率能降低硬件成本、复杂度及提高系统性能。若已知全部的发射端信道状态信息(CSI),提出了最大比率发射(MRT)技术和发射天线选择(TAS)技术相结合的超宽带系统。基于信道功率增益最大的天线选择准则,系统选择较好的天线子集(MT ,2；MR )工作,并采用 MRT技术优化分配所选择的双天线发射功率。仿真结果表明：结合MRT和 TAS技术的超宽带系统的误比特率性能都得到了明显改善。
다천선기술인입초관대계통시제고전수질량화항간우능력、강저오비특솔(BER)적유효방법지일。연이,수착천선수목적증가,경건성본야수지제고。천선선택기술화우화발사공솔능강저경건성본、복잡도급제고계통성능。약이지전부적발사단신도상태신식(CSI),제출료최대비솔발사(MRT)기술화발사천선선택(TAS)기술상결합적초관대계통。기우신도공솔증익최대적천선선택준칙,계통선택교호적천선자집(MT ,2；MR )공작,병채용 MRT기술우화분배소선택적쌍천선발사공솔。방진결과표명：결합MRT화 TAS기술적초관대계통적오비특솔성능도득도료명현개선。
Multiple antennas technique which is introduced into UWB system is an effective method to improve transmission quality,enhance the system performance and decrease the bit error rates (BER).However,the large number of antennas requires lots of expensive hardware.Combining antennas selection and power optimization technique can decrease hardware cost and complexity,and enhance the system performance.In the case of knowing entire channel state information (CSI),in this paper, maximum ratio transmission (MRT)and transmit antennas selection (TAS )technique are introduced at the transmitter.Based on the maximal channel power gain which is adopted as an antennas selection criteria,the better antenna subset (MT,2;MR)is always operated on the system,and then the selected double antennas transmit power are allocated by the MRT technique.Simulation results show that the bit error rate (BER)of the UWB system obtain obvious improvement after combining MRT with TAS .