center.asv

OFDM系统

function BER = Center (SNR)

global FLAG_AWGN;
global FLAG_MULTIPATH;
global Num_Channel;

global Num_Bit;

Num_Bit=2^8;

% Num_Sym=Num_Bit/4; %%%%%%%%%%%%
Num_ErrorBit_Sum=0;
Num_Packet = 500;

i=1;
while( i <= Num_Packet )
    
    [ BitData, TransData ] = Transmit ( );
    [ RecData, ChanData ]  = Channel( TransData, SNR );      
    [ DeMapBitData ]       = Receive( RecData, ChanData );
    
    Num_ErrorBit = sum(xor(BitData,DeMapBitData));    
    Num_ErrorBit_Sum = Num_ErrorBit_Sum + Num_ErrorBit;

    if( (i==Num_Packet) && (Num_Packet<10000) )
        if( Num_ErrorBit_Sum < 100 )
            Num_Packet = Num_Packet + 500;
        end
    end
    i=i+1;
    
end

BER=Num_ErrorBit_Sum / (Num_Bit*Num_Packet);