Increase default max LDPC iter to 8

Doing only 5 LDPC iterations by default leads to a poor reception
performance, and correspondingly many retransmissions. Increase to 8 as
the new default to improve user experience.

executables/nr-uesoftmodem.h

@@ -36,7 +36,7 @@
   {"single-thread-disable",    CONFIG_HLP_NOSNGLT,             PARAMFLAG_BOOL,  .iptr=&single_thread_flag,                .defintval=1,                    TYPE_INT,      0}, \
   {"dlsch-parallel",           CONFIG_HLP_DLSCH_PARA,          0,               .u8ptr=NULL,                              .defintval=0,                    TYPE_UINT8,    0}, \
   {"offset-divisor",           CONFIG_HLP_OFFSET_DIV,          0,               .uptr=&nrUE_params.ofdm_offset_divisor,   .defuintval=8,                   TYPE_UINT32,   0}, \
-  {"max-ldpc-iterations",      CONFIG_HLP_MAX_LDPC_ITERATIONS, 0,               .iptr=&nrUE_params.max_ldpc_iterations,   .defuintval=5,                   TYPE_UINT8,    0}, \
+  {"max-ldpc-iterations",      CONFIG_HLP_MAX_LDPC_ITERATIONS, 0,               .iptr=&nrUE_params.max_ldpc_iterations,   .defuintval=8,                  TYPE_UINT8,    0}, \
   {"nr-dlsch-demod-shift",     CONFIG_HLP_DLSHIFT,             0,               .iptr=(int32_t *)&nr_dlsch_demod_shift,   .defintval=0,                    TYPE_INT,      0}, \
   {"V" ,                       CONFIG_HLP_VCD,                 PARAMFLAG_BOOL,  .iptr=&vcdflag,                           .defintval=0,                    TYPE_INT,      0}, \
   {"uecap_file",               CONFIG_HLP_UECAP_FILE,          0,               .strptr=&uecap_file,                      .defstrval="./uecap_ports1.xml", TYPE_STRING,   0}, \

openair2/GNB_APP/L1_nr_paramdef.h

@@ -81,7 +81,7 @@
   {CONFIG_STRING_L1_PRACH_DTX_THRESHOLD,               NULL,       0,         .uptr=NULL,           .defintval=150,             TYPE_UINT,     0},         \
   {CONFIG_STRING_L1_PUSCH_DTX_THRESHOLD,               NULL,       0,         .uptr=NULL,           .defintval=50,              TYPE_UINT,     0},         \
   {CONFIG_STRING_L1_SRS_DTX_THRESHOLD,                 NULL,       0,         .uptr=NULL,           .defintval=50,              TYPE_UINT,     0},         \
-  {CONFIG_STRING_L1_MAX_LDPC_ITERATIONS,               NULL,       0,         .uptr=NULL,           .defintval=5,               TYPE_UINT,     0},         \
+  {CONFIG_STRING_L1_MAX_LDPC_ITERATIONS,               NULL,       0,         .uptr=NULL,           .defintval=8,              TYPE_UINT,     0},         \
   {CONFIG_STRING_L1_RX_THREAD_CORE,                    NULL,       0,         .uptr=NULL,           .defintval=-1,              TYPE_UINT,     0},          \
   {CONFIG_STRING_L1_TX_THREAD_CORE,                    NULL,       0,         .uptr=NULL,           .defintval=-1,              TYPE_UINT,     0},          \
   {CONFIG_STRING_L1_TX_AMP_BACKOFF_dB,                 HLP_L1TX_BO,0,         .uptr=NULL,           .defintval=36,              TYPE_UINT,     0},         \

targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf

@@ -191,7 +191,6 @@ L1s = (
 {
   num_cc = 1;
   tr_n_preference = "local_mac";
-  max_ldpc_iterations = 5;
   ofdm_offset_divisor = 8; #set this to UINT_MAX for offset 0
 }
 );

targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf

@@ -213,7 +213,6 @@ L1s = (
   prach_dtx_threshold = 130
   pucch0_dtx_threshold = 80;
   pusch_dtx_threshold = -100;
-  max_ldpc_iterations = 10;
 #thread_pool_size = 8;
   tx_amp_backoff_dB = 3;
   L1_rx_thread_core = 8;

targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x2-benetel650.conf

@@ -211,7 +211,6 @@ L1s = (
   prach_dtx_threshold = 100;
   pucch0_dtx_threshold = 80;
   pusch_dtx_threshold = 10;
-  max_ldpc_iterations = 10;
   tx_amp_backoff_dB = 20; # needs to match O-RU configuration
   L1_rx_thread_core = 8;
   L1_tx_thread_core = 10;

targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-liteon.conf

@@ -212,7 +212,6 @@ L1s = (
   prach_dtx_threshold = 130
   pucch0_dtx_threshold = 80;
   pusch_dtx_threshold = 10;
-  max_ldpc_iterations = 10;
   tx_amp_backoff_dB = 20; # needs to match O-RU configuration
   L1_rx_thread_core = 8;
   L1_tx_thread_core = 10;