power3rdrt.m

无线仿真Matlab代码

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%   ***************************************************************************
%
%   UMTS-HSDPA channel generator 
%
%   [P_3stRT] = Power3rdRT(numTTI,P_out,HARQcycle)
%
%   Generate the accumulated power after the 3rd ReTransmission
%   i.e. after four transmissions
%
%   This function should only be used when the HARQ process consists of 
%   four transmissions.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function [P_3rdRT] = Power3rdRT(numTTI,P_out,HARQcycle)

% Generate the powers shifted in time.
% This models the delay caused by the HARQ process 

P_out_shft=[P_out(HARQcycle+1:numTTI);zeros(HARQcycle,1)];              
% P_out_shft=[P_out(no tail) 0 0 0 0 0 0] (length: numTTI)

P_out_twoshfts=[P_out(2*HARQcycle+1:numTTI);zeros(2*HARQcycle,1)];              
% P_out_twoshfts=[P_out(no tail) 0 0 0 0 0 0 0 0 0 0 0 0] (length: numTTI)

P_out_threeshfts=[P_out(3*HARQcycle+1:numTTI);zeros(3*HARQcycle,1)];              
% P_out_threeshfts=[P_out(no tail) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] (length: numTTI)

% Maximal Ratio Combining is used at the receiver. The following is the 
% result when the original transmission and its next three HARQ ReTransmission 
% powers are combined:

% This formula has been changed on June 3, 2004
P_3rdRT=10*log10(10.^(P_out/10)+10.^(P_out_shft/10)+10.^(P_out_twoshfts/10)+10.^(P_out_threeshfts/10));     

% Note that the last 2*HARQcycle elements are not written to the tracefile,
% assuming that the HARQ process allows for at most three transmissions (2 ReTransm.)