added some OCTAVE scripts for OFDM generation in ARCH/EXMIMO/USERSPACE/OCTAVE

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4091 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/ARCH/EXMIMO/USERSPACE/OCTAVE/txsig_ofdm.m

+dual_tx=1;
+cbmimo1=0;
+
+if (cbmimo1)
+  oarf_config(0,1,dual_tx,255);
+  amp = pow2(7)-1;
+  n_bit = 8;
+else
+  oarf_config_exmimo(1902600000,1,dual_tx,30);
+  amp = pow2(15)-1;
+  n_bit = 16;
+end
+
+s = zeros(76800,2);
+s(:,1) = 8*floor(amp*OFDM_TX_FRAME(512,211,128,120,8));
+s(:,2) = 8*floor(amp*OFDM_TX_FRAME(512,211,128,120,8));
+
+
+%s(:,1) = amp * (exp(sqrt(-1)*.5*pi*(0:((76800)-1))));
+%s(:,2) = amp * (exp(sqrt(-1)*.5*pi*(0:((76800)-1))));
+
+if (cbmimo1)
+  oarf_set_tx_gain(110,110,110,110);
+end
+oarf_send_frame(0,s,n_bit);
+
+plot(20*log10(abs(fft(s(:,1)))))