舰船电子工程
艦船電子工程
함선전자공정
SHIP ELECTRONIC ENGINEERING
2012年
12期
45-48
,共4页
波束形成%空时编码%编码增益
波束形成%空時編碼%編碼增益
파속형성%공시편마%편마증익
beam forming%STBC%code gain
针对多输入多输出OFDM系统提出了一种简单灵活的空时分组码与多维特征波束形成组合方案,以充分利用MIMO信道的二阶统计信息。该方案在保证空时编码分集度的同时能最大化系统的编码增益,空时分组码的选取并不受实际发射天线数的限制,因此可以在分集度、编码增益以及系统码率之间进行灵活的折中。理论分析和仿真结果同时表明,当实际发射天线数大于空时码所需天线数时,系统的编码增益随着实际发射天线数的增加近似呈线性增长,发射天线阵列间相关性越强,增长速度越快。
針對多輸入多輸齣OFDM繫統提齣瞭一種簡單靈活的空時分組碼與多維特徵波束形成組閤方案,以充分利用MIMO信道的二階統計信息。該方案在保證空時編碼分集度的同時能最大化繫統的編碼增益,空時分組碼的選取併不受實際髮射天線數的限製,因此可以在分集度、編碼增益以及繫統碼率之間進行靈活的摺中。理論分析和倣真結果同時錶明,噹實際髮射天線數大于空時碼所需天線數時,繫統的編碼增益隨著實際髮射天線數的增加近似呈線性增長,髮射天線陣列間相關性越彊,增長速度越快。
침대다수입다수출OFDM계통제출료일충간단령활적공시분조마여다유특정파속형성조합방안,이충분이용MIMO신도적이계통계신식。해방안재보증공시편마분집도적동시능최대화계통적편마증익,공시분조마적선취병불수실제발사천선수적한제,인차가이재분집도、편마증익이급계통마솔지간진행령활적절중。이론분석화방진결과동시표명,당실제발사천선수대우공시마소수천선수시,계통적편마증익수착실제발사천선수적증가근사정선성증장,발사천선진렬간상관성월강,증장속도월쾌。
Aiming at multiple input and multiple output OFDM system,a simple and flexible space-time block codes and multidimensional characteristics of beam forming combination scheme is proposed,in order to make full use of the two order statistics of MIMO channel.In the scheme of space-time coding diversity at the same time which maximizes the system coding gain,space-time block codes is not affected by the actual number of transmit antennas selection,so it can be the diversity degree of coding gain and rate between the flexible compromise.Theoretical analysis and simulation results also show that,when the actual number of transmit antennas is greater than the number of antennas space-time codes,system coding gain with the actual number of transmit antennas increases approximately linearly increases,the transmit antenna array correlation is stronger with it.
