get_datablock.m

这个程序主要是实现空时编码的matlab编解码仿真。

function [data_block]=get_datablock(data,block_size,iteration)

%   [data_block]=get_datablock(data,block_size,iteration)
%
%	Output:
%	data_block	- Function output (binary-vector)
%	
%   Input:
%   data        - Data to be put in parts, (one row many columns!!) (binary-vector)
%   block_size  - Size of datablock in each transmission (integer splitting data into correct size)
%   iteration   - Iteration cycle from 0 to number_of_blocks (integer 0,...)
%
%   Short Theoretical Background for the Function:
%   
%   The function is meant to be called from an iteration-cycle,
%   where iteration tells the function which block to be called.
%
%   If the block_size is not a integer-multiple of data, zeros are added.
%   If iteration > number_of_blocks, data_block is set to 0.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
%%% Function part of simulation for Space-Time
%%% coding project, group Grey-2001.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%   Author: Stefan Uppg錼d
%   Date: 2001-03-19
%   Version: 1.0
%   Revision (Name & Date):
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

first_value = 1 + (iteration * block_size);     % Elementnumber of first element in data to be extracted
last_value  = (iteration + 1) * block_size;

number_of_blocks = ceil(length(data) / block_size);

if(iteration < number_of_blocks-1)
    data_block = data(first_value:last_value);
elseif(iteration == number_of_blocks-1)
    number_add = block_size - length(data(first_value:end));    % Number of zeros to add if block_size is not multiple of datalength
    data_block = [data(first_value:end) zeros(1,number_add)];
else
    data_block = 0;
end