# 42890 4G Mobile Technologies

42890 4G Mobile TechnologiesPage1Laboratory 1: LTEPhysical LayerMeasurementDate: 26/03/14Aims:This laboratory is designed toprovidestudents an overview of LTE physicallayerprocedure and the performance measurements. Students will apply theory toevaluateactual measurements results recorded from a live LTE networkusing a commercialmeasurement tool (NEMO Handy by Anite).Basic MATLAB code is given as a tool forstudents to demonstrate and analyse the measurement results.Outline:Section 1?Introduction to Relevant Theory?Physical Downlink Shared Channel (PDSCH)?Physical Downlink Control Channel (PDCCH)?Resource AllocationMethods?Spatial Multiplexing SchemesSection 2?Measurement Explanationsand Examples2.1 System Description2.2 Measurement Data Representation2.2.1 PRB Percentage2.2.2 Modulation PercentageSection3?Laboratory ExercisesAppendix A?Resource Allocation MethodsType 0, Type 1 and Type 2Appendix B?MATLAB Codeto Convert Excel Data to MATLAB42890 4G Mobile TechnologiesPage143.3Consider the number of allocated PRB, explain if the results consistent with thetheory and provide an example to support your claim ***There may be more than one correct methods to answer the questions. Students areencouraged to explain the logics/theories to support their own ways to answer thequestions.42890 4G Mobile TechnologiesPage17Appendix B:MATLAB Code to Convert Excel Data to MATLABNOTE:Theexcel file needs to be located in the same folder where theMATLAB code given in thisappendix will be run.The code may bemodified to suit your need.clear[ndata, text, alldata] = xlsread(?Lab1_Data.xls?);out1=[zeros(1,238);ndata];MCS_ID0=[zeros(1,length(2:33));out1(2:168,2:33)];% Extract PDSCH MCSIndex for Codework d0 1 to 32(ColumnB to AG in the excel, orcolumns2 to 33)MCS_ID1=[zeros(1,length(34:65));out1(2:168,34:65)];% Extract PDSCH MCSIndex for Codework d11 to 32(ColumnAH to BM in the excelorcolumns34 to 65)PRB_P_=[0.1+zeros(1,length(66:86));out1(2:168,66:86)];% Extract PDSCHPRB percentage (ColumnBN to CH in the excel, orcolumns66 to 86)PRB_N_=[0.1+zeros(1,length(87:107));out1(2:168,87:107)];% ExtractPDSCHPRBquantity(ColumnCItoDCin the excel, orcolumns87to107)fori=1:length(PRB_P_(:,1))%Rearrange data in PRB percentageforii=1:length(PRB_P_(1,:))ifPRB_P_(i,ii)<1000PRB_P(i,ii)=PRB_P_(i,ii);elsePRB_P(i,ii)=0;endendendfori=1:length(PRB_N_(:,1))%Rearrange data in PRB quantityforii=1:length(PRB_N_(1,:))ifPRB_N_(i,ii)<1000PRB_N(i,ii)=PRB_N_(i,ii);elsePRB_N(i,ii)=0;endendendforiii=108:139% Extract Modulation & Coding Scheme index from the rawdata and convert from strings to numbers for Codeword d0.forii=1:168ifstrcmp(alldata(ii,iii),? QPSK?)==1MOD0(ii,iii?107)=2;elseifstrcmp(alldata(ii,iii),? 16QAM?)==1MOD0(ii,iii?107)=4;42890 4G Mobile TechnologiesPage19endfori=1:168mPRB(i)=(sum(PRB_N(i,:).*PRB_P(i,:)))/100;endx= [30 50 63 100];%The variable xcan beany arbitrary integer lessthan163;figure(1)fori=1:4subplot(2,2,i)bar(PRB_N_(x(i),:),PRB_P_(x(i),:))axis([?2 52 0 100])title([?PRB Percentage, t =?num2str(x(i))])xlabel(?#PRBs?)ylabel(?[%]?)endfigure(2)fori=1:4subplot(2,2,i)bar([MOD_PP(x(i),:)])axis([0 4 0 100])set(gca,?XTickLabel?,{?QPSK?,?16QAM?,?64QAM?})title([?Modulation Percentage, t =?num2str(x(i))])ylabel(?[%]?)endReferences:S. Sesia et al, LTE?the UMTS Long TermEvolution from Theory to Practice,Wiley, 2009.!

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