%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% filename : DespreadProcess.m
% description : spreading processing (调制输出的速率为码速率的1倍 25MHz)
% input :
% DataType : 数据类型，如同步段数据（0）、控制段数据（1）、业务段数据（2）
% DespreadType ：解扩类型 ，1软解扩，0硬解扩
% Gain ：扩频增益
% ReDataInput ：解调输出，比特流{0，1} 或 对数似然比
% CodeOffset ：码相位
% DCHopSeedLevel：业务段OVSF码的跳码速率等级（即一帧数据里面跳几次）
% output ：
% DS_DeOutput ：解扩输出比特流{0，1}
%
% calling ：CH_Pattern.m
% OVSF.m
% DCH_Pattern.m
% calling by :
function DS_DeOutput = DespreadProcess(DataType,DespreadType,Gain,ReDataInput,CodeOffset,DCHopSeedLevel)
if (DespreadType == 0)
DataInputB = 2*ReDataInput - 1;
else
DataInputB = ReDataInput;
end
% fsample = 800e6;%采样频率
% fcode = 10e6; %扩频码频率
% PerCode = fsample/fcode;
% HalfCode = PerCode/2;
% Number = length(ReDataInput);%输入数据长度
if (CodeOffset ~= 0)
DespreadDataBuff = DataInputB(Gain-CodeOffset+1:end);
else
DespreadDataBuff = DataInputB;
end
DeData = length(DespreadDataBuff);
if ( DataType == 0)
DS_DeOutput = [];
elseif( DataType == 1)
%=================控制段 =============
% CHPattern = CH_Pattern(DeData/Gain);%跳码图案
% [balance_code,~] = generatebalancegoldcode(3);%跳码扩频码
CHPattern = CH_Pattern(DeData/Gain);%跳码图案
OVSFArray=OVSF(Gain);%跳码扩频码
balance_code =[OVSFArray(2:end,:);OVSFArray(end,:)];
DataBuff = balance_code(CHPattern,:);
DS_OutputB = reshape(DataBuff',1,DeData);
DS_OutputBuff = DS_OutputB.*DespreadDataBuff;
DataIntegral = sum(reshape(DS_OutputBuff,Gain,DeData/Gain));
DS_DeOutput = zeros(1,DeData/Gain);
for CntD = 1:DeData/Gain
if(DespreadType) %软解扩
% if(DataIntegral(CntD) < 0)
% DS_DeOutput(CntD) = 1;
% elseif (DataIntegral(CntD) > 0)
% DS_DeOutput(CntD) = 0;
% else
% if CntD == 1
% DS_DeOutput(CntD) = 0;
% else
% DS_DeOutput(CntD) = DS_DeOutput(CntD - 1);
% end
% end
DS_DeOutput = DataIntegral;
else %硬解扩
if(DataIntegral(CntD) < 0)
DS_DeOutput(CntD) = 0;
elseif (DataIntegral(CntD) > 0)
DS_DeOutput(CntD) = 1;
else
if CntD == 1
DS_DeOutput(CntD) = 0;
else
DS_DeOutput(CntD) = DS_DeOutput(CntD - 1);
end
end
end
end
elseif( DataType == 2)
%=================数据段 =============
DCHopSeedLevel = DeData/Gain;
DCHNumber = round(DeData/Gain/DCHopSeedLevel);
OVSFPattern = DCH_Pattern(Gain,DCHNumber,DCHopSeedLevel);%跳码图案
CodeOVSF = OVSF(Gain);
DS_DeOutput = zeros(1,DeData/Gain);
% DataBuff = zeros(Number,Gain);
DataBuff = CodeOVSF(OVSFPattern,:);
DataBuff0 = reshape(DespreadDataBuff,Gain,DeData/Gain);
DataIntegral = sum(DataBuff'.*DataBuff0);%相关运算，累加
for CntD = 1:DeData/Gain
if(DespreadType) %软解扩
% if(DataIntegral(CntD) < 0)
% DS_DeOutput(CntD) = 1;
% elseif (DataIntegral(CntD) > 0)
% DS_DeOutput(CntD) = 0;
% else
% if CntD == 1
% DS_DeOutput(CntD) = 0;
% else
% DS_DeOutput(CntD) = DS_DeOutput(CntD - 1);
% end
% end
DS_DeOutput = DataIntegral;
else %硬解扩
if(DataIntegral(CntD) < 0)%Gain/3
DS_DeOutput(CntD) = 0;
elseif (DataIntegral(CntD) > 0)
DS_DeOutput(CntD) = 1;
else
if CntD == 1
DS_DeOutput(CntD) = 0;
else
DS_DeOutput(CntD) = DS_DeOutput(CntD - 1);
end
end
end
end
end
