changed timestamp_tx for eNB mode

targets/RT/USER/lte-enb.c

@@ -1736,7 +1736,7 @@ static void* eNB_thread_single( void* param ) {
     proc_rxtx->subframe_tx = (proc->subframe_rx+4)%10;
     proc_rxtx->frame_tx    = (proc->subframe_rx>5) ? (1+proc->frame_rx)&1023 : proc->frame_rx;
     proc->frame_tx         = proc_rxtx->frame_tx;
-    proc_rxtx->timestamp_tx = proc->timestamp_tx;
+    proc->timestamp_tx     = proc->timestamp_rx+(4*fp->samples_per_tti);
     // adjust for timing offset between RRU
     if (eNB->CC_id!=0) proc_rxtx->frame_tx = (proc_rxtx->frame_tx+proc->frame_offset)&1023;