第09讲分集接收技术

1、Guilin University of Electronics Technology22022-4-27Guilin University of Electronics Technology32022-4-27Guilin University of Electronics Technology42022-4-27Guilin University of Electronics Technology52022-4-27Guilin University of Electronics Technology62022-4-27Guilin University of Electronics Te

2、chnology72022-4-27分集技术分集的目的宏观分集(抗长期衰落)微观分集(抗短期衰落)信息传输形式显分集隐分集交织和编码技术跳频技术直接序列扩频技术获取多路信号的方式空间位置分集(多天线、宏分集)空间角度分集(智能天线)时间分集(TTc)频率分集(跳频或DSSS)极化分集Guilin University of Electronics Technology82022-4-27Guilin University of Electronics Technology92022-4-27Guilin University of Electronics Technology102022-4-

3、27Guilin University of Electronics Technology112022-4-27Guilin University of Electronics Technology122022-4-27Guilin University of Electronics Technology132022-4-27Guilin University of Electronics Technology142022-4-27Guilin University of Electronics Technology152022-4-271122( /)mTf Guilin Universit

4、y of Electronics Technology162022-4-27Guilin University of Electronics Technology172022-4-271 12 21( )( )( )( )( )MM Mk kkr ta r ta r ta rta r tGuilin University of Electronics Technology182022-4-27Guilin University of Electronics Technology192022-4-27发射机1R2RNR选择电路检测器2022-4-27Guilin University of El

5、ectronics Technology201001020相对电平/dBBACt信号 A信号 B合成信号CGuilin University of Electronics Technology212022-4-27Guilin University of Electronics Technology222022-4-271,2,kM1k 1MEkkrtrtGuilin University of Electronics Technology232022-4-27发 射 机输 入移 动 台（ 发 端 ）可 变 增 益 加 权G 1A 1可 变 增 益 加 权G 2A 2可 变 增 益 加 权A

6、n同相相加检 测 器输 出基 站 （ 收 端 ）G nGuilin University of Electronics Technology242022-4-27 kkkNtra MkkkMkkkENtrtratr121)()(2022-4-2725Guilin University of Electronics TechnologyGuilin University of Electronics Technology262022-4-27kkkNrr222022-4-2727Guilin University of Electronics Technology)()(1tkMkktSMPP2

7、022-4-2728Guilin University of Electronics TechnologytkkNr2)2/(222)(kkrkkkkerrp)2()(1MktkkktSMNrPP 22/021ktktkNNkkktkkP rNpk dre 2022-4-2729Guilin University of Electronics TechnologyMkNtSMktkeP1/)1()(222221MtSMteP)1 ()(0/MtSMtePT)1 (1)(0/20N2022-4-2730Guilin University of Electronics Technology1001

8、020304099.9999.9899.9599.999.899.599989590807050201051M6M4M3M2M10lg10t%2022-4-2731Guilin University of Electronics TechnologyGuilin University of Electronics Technology322022-4-27SSSSdp)(0)/exp()/exp(1 )()(0100SMSSMSSMPddpMkSk101 dBkMDMkSS101lg10)(MkSSkMD101)(2022-4-2733Guilin University of Electron

9、ics TechnologyM1Ekkrr221212MEEkkrrNMNM2022-4-2734Guilin University of Electronics Technology1001020304099.9999.9899.9599.999.899.599989590807050201051M6M4M 3M2M1%lg10E02022-4-2735Guilin University of Electronics TechnologyMkjkjkjMkkErrNMrNM1,12),(2121j kjkr rr rjk4) 1(12) 1(221022MMMMNME2022-4-2736G

10、uilin University of Electronics Technology 4) 1(1lg10)(4) 1(1)(00MMDMMDEEEEEDM2022-4-2737Guilin University of Electronics TechnologyMkkkMkkkRNrrar121) 1 ()2/(1221MkkkMkkkRNara2022-4-2738Guilin University of Electronics TechnologykkkNr22)2()(1221MkkkMkkkkRNaNakkkNr2kkkMkMkMkqNapqppq 1212212022-4-2739

11、Guilin University of Electronics Technology MkkMkkkMkkkkNaNa11221MkkMkkkMkkMkkkRNaNa112112)(MkkR1max2022-4-2740Guilin University of Electronics TechnologyMkkRRRMkp1100)!1()/(exp1)()!1()/exp()(001MpMRMRRM2022-4-2741Guilin University of Electronics Technology2022-4-2742Guilin University of Electronics

12、 Technology1001020304099.9999.9899.9599.999.899.599989590807050201051M6M4M3M2M1lg10R0%2022-4-2743Guilin University of Electronics Technology01MMkkRMMDRR0)( MMDRRlg10)(02022-4-2744Guilin University of Electronics Technology2022-4-27Guilin University of Electronics Technology455 . 1211)2()(SSDMD dBDMD

13、SS76. 15 . 1lg10)2()( dBDMDDMDRRRR3)2()(2)2()(2022-4-27Guilin University of Electronics Technology46 78. 1411)2()(EEDMDdBMDE5 . 2)(图 4 - 8 给出了三种合并方式的AKD-(M)与M的关系曲线。 Guilin University of Electronics Technology472022-4-27选择式109876543211 23456789 10M平均信噪比改善D(M)/dB最大比值等增益Guilin University of Electronics

14、 Technology482022-4-27)2exp(21)(ePdpPe)()2exp(210Guilin University of Electronics Technology492022-4-27)/exp()/exp(1)(0100SMSSMp)4)(2(4)/exp()/exp(12)2/exp(210000002,SSSSedPGuilin University of Electronics Technology502022-4-2700001 ,21)/exp(1)2/exp(21SSSedP2,2,12044(2)eePPGuilin University of Elect

15、ronics Technology512022-4-27200)/()(RRRp21 ,2002002,2)2(2)/exp()2exp(21eRRRRePdPGuilin University of Electronics Technology522022-4-27ePe21)(dpPPee)()(0Guilin University of Electronics Technology532022-4-27)/exp()/exp(1)(0100SMSSMp0/001 ,3211210SedeePSS2022-4-27Guilin University of Electronics Technology54)2)(1 (1)/exp()/exp(12210000002,SSSedePS4,4,1192()eePP2,2,12200