L WWc flat fading WWc frequencyselective fading Tcdelay Slides: 50 Download presentation 时延扩展与多普勒扩展 L的取值与时延扩展的关系 Ø W<Wc, flat fading Ø W>Wc, frequency-selective fading 多普勒扩展与相干时间 Ø Tc<delay requirement, fast fading Ø Tc>delay requirement, slow fading 信号检测与估值 2017年春季 3 非相干检测-BPSK:广义最大似然比检验 引理 ML detection performance: Pe=0. 5 BPSK don’t work in this scenario. 信号检测与估值 2017年春季 12 非相干检测-BOM Binary Orthogonal Modulation 同理 信号检测与估值 2017年春季 13 BER of Coherent Detection Taylor series expansion 信号检测与估值 2017年春季 17 Comparison To achieve the same Pe 3 d. B difference 信号检测与估值 2017年春季 18 ML检测 BPSK Complexity: the size of the search space is 2 N! Very complexity for large N Why Large N? Efficiency=N/(N+L-1) 信号检测与估值 2017年春季 21 N=4, L=3, v=2, E=0 y HCIRC 信号检测与估值 2017年春季 x w 34 Sphere Decoding Idea behind sphere decoder 信号检测与估值 2017年春季 39 N=4 |S|=2, 算法示例 root node +1/0. 81 -1/1. 21 level 4 +1/12. 37 -1/2. 77 +1/4. 17 -1/1. 57 level 3 +1/1. 61 -1/4. 81 level 2 +1/1. 62 -1/6. 02 level 1: leaf node 复杂度 找到一个有效点,半径更新 信号检测与估值 2017年春季 42 参考文献 SD算法 Ø M. O. Damen, et al. , “On ML detection and the search for the closest lattice point, ” IEEE T Inf. Theory, vol. 49, no. 10, pp. 2389 -2402, Oct. 2003. 信号检测与估值 2017年春季 43 Wwc practice guidesHenry peach robinson fading awayPhilip larkin summer is fadingFadingNarrowband fadingShaping e chaining esempioSmall scale fading adalahHenry peach robinson fading awayLarge scale fading in wireless communicationTypes of small scale fadingCasting crowns who am iKinetics of crystal violet fadingSmall scale fadingDirect literary definitionGreater and lesser pelvisFlat structurePhong shading vs gouraud shadingPlatyhelminthesFlat band voltage formulaPyramid has how many vertices8yahooFlat stanley travel journalPola kerah sailorFlat top samplingIkea flat roof system drainVgbFlat stanley vocabularyAccordion hose load2 types of characterizationWhats this shapeChairs and keys in railwayCanyouunitRoof steel designA flat belt connects pulley a to pulley bSancar flatsMagmaWhat are examples of flat bonesFringing reefLabview stacked sequenceFlexible flat material made by interlacing yarnsWelcome back i hope you enjoyed your vacationThe deep ocean floor that is nearly flatStrengths and weaknesses of flat organizational structurePare in cooking termsPhylum platyhelminthes segmentationRollingPrimary flatFlat file serviceCan you recover from a flat spinRound and flat charactersEquivalent flat plate area