function relay = prepare_relay2send(relay,channel);
% Relay: Prepare received signal to make it ready to send
global signal;
switch relay.mode
case 'AAF'
% Amplify and Forward
% Normalise signal power to the power of the original signal
xi = abs(signal.symbol_sequence(1))^2;
relay.amplification = sqrt(xi ./ (xi .* channel(1).attenuation.h_mag .^ 2 + 2 .* channel(1).noise.sigma .^ 2));
relay.signal2send = relay.rx.received_signal .* relay.amplification;
case 'DAF'
% Decode and Forward
%relay.rx = rx_correct_phaseshift(relay.rx,channel.attenuation.phi);
%relay.symbol_sequence = rx_combine(relay.rx, channel, 0);
%relay.signal2send = relay.symbol_sequence;

case 'RCPC'
   % relay.rx = rx_correct_phaseshift(relay.rx,channel.attenuation.phi);
    %relay.symbol_sequence = rx_combine(relay.rx,channel,0);
    relay.signal2send = relay.symbol_sequence;
case 'TURBO'
    relay.signal2send = relay.symbol_sequence;
otherwise
error(['Unknown relay-mode: ', relay.mode])
end