%Cooperative?Diversity?-?Main?Sequence
tic
%?--------------
%?Set?Parameters
nr_of_iterations?=?10^3;
SNR?=?[-15:1:15];
use_direct_link?=?1;
use_relay?=?1;
global?statistic;
statistic?=?generate_statistic_structure;
global?signal;
signal?=?generate_signal_structure;
signal（1）.nr_of_bits?=?2^10;
signal.modulation_type?=?‘QPSK‘;%?’BPSK’?’QPSK’
calculate_signal_parameter;
channel?=?generate_channel_structure;
channel（1）.attenuation（1）.pattern?=?‘Rayleigh‘;%?’no’’Rayleigh’
channel.attenuation.block_length?=?1;
channel（2）?=?channel（1）;
channel（3）?=?channel（1）;
channel（1）.attenuation.distance?=?1;
channel（2）.attenuation.distance?=?1;
channel（3）.attenuation.distance?=?1;
rx?=?generate_rx_structure;
rx（1）.combining_type?=?‘ERC‘;?%’ERC’’FRC’’SNRC’’ESNRC’’MRC’
rx（1）.sd_weight?=?3;??%?used?for?‘FRC‘
global?relay;
relay?=?generate_relay_structure;
relay（1）.mode?=?‘AAF‘;?%’AAF’?’DAF’
relay.magic_genie?=?0;
relay（1）.rx（1）?=?rx（1）;?%?same?beahaviour


%?----------------
%?Start?Simulation
BER?=?zeros（size（SNR））;
for?iSNR?=?1:size（SNR2）%?returns?the?size?of?the?dimension?of?SNR??specified?by?scalar?2
channel（1）.noise（1）.SNR?=?SNR（iSNR）;?%?iSNR???????
channel（2）.noise（1）.SNR?=?SNR（iSNR）;
channel（3）.noise（1）.SNR?=?SNR（iSNR）;
disp（[‘progress:?‘int2str（iSNR）‘/‘int2str（size（SNR2））]）??%??Convert?integer?to?string
for?it?=?1:nr_of_iterations;
%?--------------
%?Reset?receiver
rx?=?rx_reset（rx）;
relay.rx?=?rx_reset（relay.rx）;
%?-----------
%?Direct?link
if?（use_direct_link?==?1）
[channel（1）?rx]?=?add_channel_effect（channel（1）?rx...
signal.symbol_sequence）;
rx?=?rx_correct_phaseshift（rx?channel（1）.attenuation.phi）;
end
%?---------
%?Multi-hop
if?（use_relay?==?1）
%?Sender?to?relay
[channel（2）?relay.rx]?=?add_channel_effect（channel（2）...
relay.rx?signal.symbol_sequence）;
relay?=?prepare_relay2send（relaychannel（2））;%????this?function?
%?Re