diff options
author | Piotr Krysik <ptrkrysik@gmail.com> | 2016-07-17 22:48:35 +0200 |
---|---|---|
committer | Piotr Krysik <ptrkrysik@gmail.com> | 2016-07-17 22:48:35 +0200 |
commit | 83afe7390fadd13cb8636ac4da1bafb9a73a5521 (patch) | |
tree | 5ac105f23da8880f433a343fd4721844c3d0cc1c /lib/receiver | |
parent | a94adb186438498dcc6513cc68d8f2ee4155e6f5 (diff) |
Changed clock offset controller and company in order to remove from the gsm_input one of the resamplers.
Diffstat (limited to 'lib/receiver')
-rw-r--r-- | lib/receiver/clock_offset_control_impl.cc | 33 | ||||
-rw-r--r-- | lib/receiver/clock_offset_control_impl.h | 6 |
2 files changed, 23 insertions, 16 deletions
diff --git a/lib/receiver/clock_offset_control_impl.cc b/lib/receiver/clock_offset_control_impl.cc index b3a7934..7fef8fa 100644 --- a/lib/receiver/clock_offset_control_impl.cc +++ b/lib/receiver/clock_offset_control_impl.cc @@ -26,6 +26,7 @@ #endif #include <sch.h> +#include <gsm_constants.h> #include "clock_offset_control_impl.h" namespace gr @@ -33,17 +34,17 @@ namespace gr namespace gsm { clock_offset_control::sptr -clock_offset_control::make(float fc, float samp_rate) +clock_offset_control::make(float fc, float samp_rate, unsigned int osr) { return gnuradio::get_initial_sptr - (new clock_offset_control_impl(fc, samp_rate)); + (new clock_offset_control_impl(fc, samp_rate, osr)); } /* * The private constructor */ -clock_offset_control_impl::clock_offset_control_impl(float fc, float samp_rate) +clock_offset_control_impl::clock_offset_control_impl(float fc, float samp_rate, unsigned int osr) : gr::block("clock_offset_control", gr::io_signature::make(0, 0, 0), gr::io_signature::make(0, 0, 0)) @@ -55,6 +56,7 @@ clock_offset_control_impl::clock_offset_control_impl(float fc, float samp_rate) set_fc(fc); set_samp_rate(samp_rate); + set_osr(osr); d_alfa = 0.3; d_ppm_estimate = -1e6; d_last_ppm_estimate = -1e6; @@ -73,6 +75,11 @@ clock_offset_control_impl::~clock_offset_control_impl() { } +void clock_offset_control_impl::set_osr(unsigned int osr) +{ + d_osr = osr; +} + void clock_offset_control_impl::set_fc(float fc) { d_fc = fc; @@ -114,7 +121,7 @@ void clock_offset_control_impl::process_measurement(pmt::pmt_t msg) if(state == "fcch_search") { - send_ctrl_messages(ppm); + send_ctrl_messages(freq_offset); d_last_fcch_time = d_current_time; } else @@ -138,7 +145,7 @@ void clock_offset_control_impl::process_measurement(pmt::pmt_t msg) { // pmt::pmt_t msg_ppm = pmt::from_double(ppm); // message_port_pub(pmt::intern("ppm"), msg_ppm); - send_ctrl_messages(ppm); + send_ctrl_messages(freq_offset); d_last_ppm_estimate = d_ppm_estimate; } } @@ -160,17 +167,15 @@ void clock_offset_control_impl::process_measurement(pmt::pmt_t msg) } } -void clock_offset_control_impl::send_ctrl_messages(float ppm) +void clock_offset_control_impl::send_ctrl_messages(float freq_offset) { -// pmt::pmt_t msg_ppm = pmt::from_double(ppm); -// message_port_pub(pmt::intern("ctrl"), msg_ppm); -// d_last_fcch_time = d_current_time; - - pmt::pmt_t msg_set_phase_inc = pmt::cons(pmt::intern("set_phase_inc"), pmt::from_double(2*M_PI*d_fc/d_samp_rate*ppm/1.0e6)); - message_port_pub(pmt::intern("ctrl"), msg_set_phase_inc); + double samp_rate_ratio = d_samp_rate / (d_osr * GSM_SYMBOL_RATE); - pmt::pmt_t msg_set_resamp_ratio = pmt::cons(pmt::intern("set_resamp_ratio"), pmt::from_double(1+ppm/1.0e6)); - message_port_pub(pmt::intern("ctrl"), msg_set_resamp_ratio); + pmt::pmt_t messages = pmt::make_dict(); + messages = dict_add(messages, pmt::string_to_symbol("set_phase_inc"), pmt::from_double(-2*M_PI*freq_offset/(d_osr * GSM_SYMBOL_RATE))); + messages = dict_add(messages, pmt::string_to_symbol("set_resamp_ratio"), pmt::from_double((1-(freq_offset/d_fc))*samp_rate_ratio)); + messages = dict_add(messages, pmt::string_to_symbol("setting_freq_offset"), pmt::from_double(-freq_offset)); + message_port_pub(pmt::intern("ctrl"), messages); } void clock_offset_control_impl::timed_reset() diff --git a/lib/receiver/clock_offset_control_impl.h b/lib/receiver/clock_offset_control_impl.h index cc0ea3d..60c3df6 100644 --- a/lib/receiver/clock_offset_control_impl.h +++ b/lib/receiver/clock_offset_control_impl.h @@ -33,6 +33,7 @@ namespace gr { private: float d_fc; float d_samp_rate; + unsigned int d_osr; float d_alfa; float d_ppm_estimate; float d_last_ppm_estimate; @@ -44,15 +45,16 @@ namespace gr { bool d_first_time; void process_measurement(pmt::pmt_t msg); - void send_ctrl_messages(float ppm); + void send_ctrl_messages(float freq_offset); void timed_reset(); void reset(); public: - clock_offset_control_impl(float fc, float samp_rate); + clock_offset_control_impl(float fc, float samp_rate, unsigned int osr); ~clock_offset_control_impl(); virtual void set_fc(float fc); virtual void set_samp_rate(float samp_rate); + virtual void set_osr(unsigned int osr); }; } // namespace gsm } // namespace gr |