SRSUE: expose correct synch error parameter

lib/include/srslte/interfaces/ue_interfaces.h

@@ -495,6 +495,7 @@ typedef struct {
   float         snr_ema_coeff                    = 0.1f;
   std::string   snr_estim_alg                    = "refs";
   bool          agc_enable                       = true;
+  bool          correct_sync_error               = false;
   bool          cfo_is_doppler                   = false;
   bool          cfo_integer_enabled              = false;
   float         cfo_correct_tol_hz               = 1.0f;

srsue/src/main.cc

@@ -255,6 +255,11 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
        bpo::value<uint32_t>(&args->phy.intra_freq_meas_period_ms)->default_value(200),
        "Period of intra-frequency neighbour cell measurement in ms. Maximum as per 3GPP is 200 ms.")
 
+    ("phy.correct_sync_error",
+       bpo::value<bool>(&args->phy.correct_sync_error)->default_value(false),
+       "Channel estimator measures and pre-compensates time synchronization error. Increases CPU usage, improves PDSCH "
+       "decoding in high SFO and high speed UE scenarios.")
+
     ("phy.cfo_is_doppler",
        bpo::value<bool>(&args->phy.cfo_is_doppler)->default_value(false),
        "Assume detected CFO is doppler and correct the UL in the same direction. If disabled, the CFO is assumed"

srsue/src/phy/phy_common.cc

@@ -104,7 +104,7 @@ void phy_common::set_ue_dl_cfg(srslte_ue_dl_cfg_t* ue_dl_cfg)
   }
 
   chest_cfg->rsrp_neighbour       = false;
-  chest_cfg->sync_error_enable    = false;
+  chest_cfg->sync_error_enable    = args->correct_sync_error;
   chest_cfg->interpolate_subframe = args->interpolate_subframe_enabled;
   chest_cfg->cfo_estimate_enable  = args->cfo_ref_mask != 0;
   chest_cfg->cfo_estimate_sf_mask = args->cfo_ref_mask;

srsue/ue.conf.example

@@ -281,6 +281,8 @@ enable = false
 # equalizer_mode:       Selects equalizer mode. Valid modes are: "mmse", "zf" or any 
 #                       non-negative real number to indicate a regularized zf coefficient.
 #                       Default is MMSE.
+# correct_sync_error:   Channel estimator measures and pre-compensates time synchronization error. Increases CPU usage,
+#                       improves PDSCH decoding in high SFO and high speed UE scenarios.
 # sfo_ema:              EMA coefficient to average sample offsets used to compute SFO
 # sfo_correct_period:   Period in ms to correct sample time to adjust for SFO
 # sss_algorithm:        Selects the SSS estimation algorithm. Can choose between
@@ -322,6 +324,7 @@ enable = false
 #pdsch_max_its       = 8    # These are half iterations
 #nof_phy_threads     = 3
 #equalizer_mode      = mmse
+#correct_sync_error  = false
 #sfo_ema             = 0.1
 #sfo_correct_period  = 10
 #sss_algorithm       = full