%%?802.11b?1Mbps?PHY?link.
%?This?M?code?simulates?DBPSK?modulation?and?barker?code?spreading
%?on?a?perfectly?synchonized?802.11b?link.?It?calculates?the?BER
%?rate?at?each?EsNo?（EbNo）?and?plots?the?result.

%%?Simulation?parameters
%?For?each?BER?loop?we?specify?the?number?of?packets?to?transmit?the?packet?size?and
%?the?range?of?channel?EsNo?values?to?test.

EsNoRange=[0:2:10];?%?Range?of?noice?levels?to?calculate?BER
NumPackets=2;
PacketSizeBytes=1024;
PacketSizeBits=PacketSizeBytes*8;?%?Here?we?ignore?preamble?and?sync?bits
clear?BERResults;

%%?System?parameters?and?constants
%?Specify?a?number?of?system?constants.

%?Spreading?parameters
Barker=[1?-1??1??1?-1??1??1??1?-1?-1?-1]‘;?%?Barker?sequence
SpreadingRate=length（Barker）;??????????????%?Spreading?rate

%?Upsampling?rate
SamplesPerChip=8;

%?Filter?order?and?coefficients?-?root?raised?cosine
FilterOrder=40;?%?Set?to?multiple?of?SamplesPerChip?to?make?delay?calculation?easy
h=firrcos（FilterOrder7e6.788e6‘rolloff‘‘sqrt‘FilterOrder/2kaiser（FilterOrder+11））;

%%?Delay?calculation
%?Calclate?（specify）?the?net?number?of?bits?delay?in?the?link?due
%?to?the?filtering.
%
%?*?samples_delay?=?2?filters?x?（40?coeffs?/?2）?=?40?samples
%?*?chips_delay?=?sample_delay/SamplesPerChip?=?40/8?=?5?chips
%?*??Must?recalculate?delay?if?you?change?any?of?these?parameters
%?We?must?delay?the?signal?6?more?chips?to?align?it?with?the?11?chip
%?boundary.?This?results?in?an?11?chip?delay?or?one?symbol/bit?delay.
%?You?must?recalculate?total?and?additional?delay?if?you?change?any?of?these
%?parameters

BitDelay=1;
ChipDelayAdd=6;

%%?Main?BER?loop
%?Calculates?the?BER?for?each?EsNo?level.?

NumEsNos=length（EsNoRange）;

disp（‘?‘）;disp（‘Start?Simulation‘）;
for?EsNoIndex?=1:NumEsNos
????
????EsNo=EsNoRange（EsNoIndex）;
????disp（[‘Simulating:?EsNo=‘?num2str（EsNo）?‘dB‘]）;
????SNR=EsNo+10*log10（1/SpreadingRate）+10*log10（1/SamplesPerChip）;

????%?Initialize?system?and?simulation?measurements?state

????%?Bits
????TotalBits=logical（0）;?%?Bit?count?for?BER?calculation
????ErrorBits=logical（0）;?%?Error?count?for?BER?calculation
????LastTxSymbol=1;???????%?Set?DBPKS?Modulator?state
????LastRxSymbol=1;???????%?Set?DBPKS?Demodulator?state

????%?Filters
????Rx_chips_delayed_store=zeros（ChipDelayAdd1）;
????Tx_bits_delayed_store=logical（zeros（BitDelay1））;

????Tx_Filter_State=h（1:end-1）;?%?Fill?filter?with?a?+1?symbol
????Rx_Filter_State=h（1:end-1）;?%?Fill?filter?with?a?+1?symbol

????%?Main?simulation?loop
????%?Each?packet?is?transmitted?and?the?recieved?bits?compared?with?the
????%?transmitted?bits?to?calculate?the?BER.
????for?Packet=1:NumPackets

????????%?Construct?frame?of?bits
????????Tx_bits=rand（PacketSizeBits1）>.5;???????????%?Random?bits

????????%?Modulate
????????Tx_bits_bp=（1-2*Tx_bits）;????????????????????%?Convert?to?bipolar?01?-->?1?-1
????????Tx_symbols=LastTxSymbol*cumprod（Tx_bits_bp）;?%?New?DBPSK?symbol?=?previous

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????38912??2005-02-16?17:17??Matlab_Wireless_Communications_example\WCDMA?FDD?Simulink?Models\Description.doc

?????文件????1355279??2005-02-16?17:17??Matlab_Wireless_Communications_example\WCDMA?FDD?Simulink?Models\WCDMA?Model?+?presentation.zip

?????文件??????47104??2005-02-16?20:42??Matlab_Wireless_Communications_example\UWB?polycycle\Description.doc

?????文件???????3084??2005-02-16?20:43??Matlab_Wireless_Communications_example\UWB?polycycle\gpolycycle1.m

?????文件??????46080??2005-02-16?20:50??Matlab_Wireless_Communications_example\UWB?monopulse1\Description.doc

?????文件???????2350??2005-02-16?20:49??Matlab_Wireless_Communications_example\UWB?monopulse1\UWB_monocycle1.m

?????文件??????46592??2005-02-16?20:38??Matlab_Wireless_Communications_example\UWB?Monocycle\Description.doc

?????文件???????2571??2005-02-16?20:38??Matlab_Wireless_Communications_example\UWB?Monocycle\UWB_monocycle1.m

?????文件??????46080??2005-02-16?20:45??Matlab_Wireless_Communications_example\UWB?link?Analysis\Description.doc

?????文件???????5633??2005-02-16?20:45??Matlab_Wireless_Communications_example\UWB?link?Analysis\UWB_monocycle2.m

?????文件??????37376??2005-02-16?20:41??Matlab_Wireless_Communications_example\UWB?channel?model\Description.doc

?????文件??????11051??2005-02-16?20:40??Matlab_Wireless_Communications_example\UWB?channel?model\UWB_Channel_IEEE_802_15_3a.zip

?????文件??????46080??2005-02-16?20:54??Matlab_Wireless_Communications_example\UWB?BPSK?Fifth?Order?Derivative\Description.doc

?????文件??????15374??2005-02-16?20:53??Matlab_Wireless_Communications_example\UWB?BPSK?Fifth?Order?Derivative\UWBBPSK3.m

?????文件??????46080??2005-02-16?20:44??Matlab_Wireless_Communications_example\UWB?BPSK?Analysis\Description.doc

?????文件??????17757??2005-02-16?20:44??Matlab_Wireless_Communications_example\UWB?BPSK?Analysis\UWBBPSK.m

?????文件??????46080??2005-02-16?20:47??Matlab_Wireless_Communications_example\UWB?Analysis\Description.doc

?????文件??????10829??2005-02-16?20:47??Matlab_Wireless_Communications_example\UWB?Analysis\UWB_analysis.m

?????文件??????46080??2005-02-16?20:52??Matlab_Wireless_Communications_example\Uncorrelated?Rayleigh?fading?channels\Description.doc

?????文件???????2417??2005-02-16?20:52??Matlab_Wireless_Communications_example\Uncorrelated?Rayleigh?fading?channels\modified_jakes.m

?????文件??????39424??2005-02-16?17:31??Matlab_Wireless_Communications_example\Ultrawideband?（UWB）?multiband?OFDM?physical?layer?with?fixed-point?transmitterreceiver?modeling\Description.doc

?????文件?????116057??2005-02-16?17:29??Matlab_Wireless_Communications_example\Ultrawideband?（UWB）?multiband?OFDM?physical?layer?with?fixed-point?transmitterreceiver?modeling\uwb.zip

?????文件??????47616??2005-02-16?20:26??Matlab_Wireless_Communications_example\Two?Tone?Test?for?LNA?in?RF?Receiver\Description.doc

?????文件??????45571??2005-02-16?20:26??Matlab_Wireless_Communications_example\Two?Tone?Test?for?LNA?in?RF?Receiver\two_tone_lna.mdl

?????文件??????46080??2005-02-16?20:56??Matlab_Wireless_Communications_example\Transmission?line?length?formula?for?coaxial?cable?to?an?antenna\Description.doc

?????文件????????296??2005-02-16?20:55??Matlab_Wireless_Communications_example\Transmission?line?length?formula?for?coaxial?cable?to?an?antenna\xmitlnlength.m

?????文件??????60416??2005-02-16?19:47??Matlab_Wireless_Communications_example\ToyFDTD?（Example?of?the?FDTD?method?with?graphical?output）\Description.doc

?????文件??????29166??2005-02-16?19:45??Matlab_Wireless_Communications_example\ToyFDTD?（Example?of?the?FDTD?method?with?graphical?output）\ToyFDTD1.m

?????文件??????49152??2005-02-16?17:48??Matlab_Wireless_Communications_example\Software?Defined?Radio\Description.doc

?????文件??????28602??2005-02-16?17:48??Matlab_Wireless_Communications_example\Software?Defined?Radio\sdr_model.zip

............此處省略177個文件信息