From 93acc2e70893a462e9288f75af0f7540e2260f31 Mon Sep 17 00:00:00 2001
From: yagoda <tallonj@tcd.ie>
Date: Thu, 4 May 2017 11:56:48 +0100
Subject: [PATCH] small update to decimation logic

---
 srslte/examples/pdsch_ue.c | 13 +++++++++++--
 srslte/lib/sync/pss.c      |  3 ++-
 srslte/lib/sync/sync.c     |  1 -
 srslte/lib/ue/ue_sync.c    |  2 +-
 4 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/srslte/examples/pdsch_ue.c b/srslte/examples/pdsch_ue.c
index 1c2b55976..521755691 100644
--- a/srslte/examples/pdsch_ue.c
+++ b/srslte/examples/pdsch_ue.c
@@ -417,8 +417,17 @@ int main(int argc, char **argv) {
 
   } else {
 #ifndef DISABLE_RF
-      if(!prog_args.decimate)
-        ue_sync.decimate = prog_args.decimate;
+      if(prog_args.decimate)
+      {
+          if(prog_args.decimate > 4 || prog_args.decimate < 0)
+          {
+              printf("Invalid decimation factor, setting to 1 \n");
+          }
+          else
+          {
+              ue_sync.decimate = prog_args.decimate;
+          }
+      }
     if (srslte_ue_sync_init_multi(&ue_sync, cell, srslte_rf_recv_wrapper, prog_args.rf_nof_rx_ant, (void*) &rf)) {
       fprintf(stderr, "Error initiating ue_sync\n");
       exit(-1); 
diff --git a/srslte/lib/sync/pss.c b/srslte/lib/sync/pss.c
index c470c89ad..661dd94a7 100644
--- a/srslte/lib/sync/pss.c
+++ b/srslte/lib/sync/pss.c
@@ -119,10 +119,11 @@ int srslte_pss_synch_init_fft_offset(srslte_pss_synch_t *q, uint32_t frame_size,
         srslte_filt_decim_cc_init(&q->filter,q->decimate,filter_order);
         q->filter.filter_output = srslte_vec_malloc((buffer_size) * sizeof(cf_t));
         q->filter.downsampled_input = srslte_vec_malloc((buffer_size + filter_order) * sizeof(cf_t));
+        printf("decimation for the  PSS search is %d \n",q->decimate);
     }
     
     
-    printf("decimation in the PSS is %d \n",q->decimate);
+   
 
         
     if (srslte_dft_plan(&q->dftp_input, fft_size, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)) {
diff --git a/srslte/lib/sync/sync.c b/srslte/lib/sync/sync.c
index 00c914276..bed3fc128 100644
--- a/srslte/lib/sync/sync.c
+++ b/srslte/lib/sync/sync.c
@@ -106,7 +106,6 @@ int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t max_offset,
     }
     
     srslte_sync_set_cp(q, SRSLTE_CP_NORM);
-      
     if(!decimate)
       decimate = 1;
                  
diff --git a/srslte/lib/ue/ue_sync.c b/srslte/lib/ue/ue_sync.c
index 22cfc09f0..cae9000c3 100644
--- a/srslte/lib/ue/ue_sync.c
+++ b/srslte/lib/ue/ue_sync.c
@@ -170,7 +170,7 @@ int srslte_ue_sync_init_multi(srslte_ue_sync_t *q,
 
     q->frame_len = q->nof_recv_sf*q->sf_len;
     
-    if(q->fft_size > 1000 && q->decimate)
+    if(q->fft_size > 700  && q->decimate)
     {
         q->sfind.decimate = q->decimate;    
     }