transmitter.m

这个第四代移动通信中

function V_blast_symble_block = transmitter(m_transmitter, QAM_bit, N_point_FFT, symbol_block_K);
%This is the system call fucntion
%the V_BLAST_OFDM system is blow

block_sim = 6;          %   blocks that the program to simulate    

%   Global simulation parameters
%m_transmitter = 4;      %   M
%n_receiver = 8;         %   N
%fir_len = 3;            %   L :the maximum length of every FIR channel in m_transmitter*n_receiver channels
%N_point_FFT = 4;        %   G
%symbol_block_K = 32;    %   the K symbols blocks 
%QAM_bit = 4;            %   16QAM

%                     M      *     2^4     *     G      *      K 
init_data_len = m_transmitter * QAM_bit * N_point_FFT * symbol_block_K ;   %inf_bits length;

%----------------------------------------------------------------
%     Transmitter side
%----------------------------------------------------------------

%   Generate the input bits
bits_inf = GetRandomSeries(init_data_len);
%bits)inf = randint(init_data_len);

%size(bits_inf);

%   series - parallel
para_bits = series2paralle(bits_inf,m_transmitter);

%----------------------------------------------------------------
%   channel encoding:here I choose Reed-Solomon code

%   16QAM Mapping 
%   this function needs to do 16QAM Mapping separately
%moduled_symbol = qam16_mapping(bits_inf,init_data_len);
size_para_bit = size(para_bits);
size_m_trans = size_para_bit(1,1);       %this para is the number of transmitter
size_single_len = size_para_bit(1,2);    %this para is the length of each parallel data bits

for i = 1:size_m_trans
    moduled_symbol(i,:) = modulation( para_bits(i,:), QAM_bit);
    %   moduled_symbol(i,:) = qam16_mapping( para_bits(i,:), size_single_len);
end;
save moduled_symbol moduled_symbol;
load moduled_symbol;

%----------------------------------------------------------------
%   V_blast Mapping
V_blast_symble_block = vblast_module(moduled_symbol);
save V_blast_symble_block V_blast_symble_block;
load V_blast_symble_block;

%----------------------------------------------------------------
%   OFDM 
%   IDFT: to focous on every subcarrier to do the DFT transformation
%       for the V_blast-OFDM, it has 2 series-parallel transformation 
%       first is at the V_blast side
%       secend is at the OFDM side
%       after the IFFT, the data bits is multiplexed in time-field

IFFT_symbols = ofdm_trans_freq(V_blast_symble_block, N_point_FFT)'; 
%the ' above is to adjust the IFFT_symbols to the paper 11
%   paper 1x is xjWu

save IFFT_symbols IFFT_symbols;
load IFFT_symbols;


%----------------------------------------------------------------
%   Space-freq symbols  
%   in the frequency defined channel this function is not use
%----------------------------------------------------------------
if 0
Space_freq_symbols = CreatTransSymbols(IFFT_symbols);
save Space_freq_symbols Space_freq_symbols;
load Space_freq_symbols;
end;


V_blast_symble_block = IFFT_symbols;