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| virtual void | set_samples_per_symbol (float sps)=0 |
| | Set the number of samples per symbol. More...
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| |
| virtual void | set_rolloff (float rolloff)=0 |
| | Set the rolloff factor of the shaping filter. More...
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| |
| virtual void | set_filter_size (int filter_size)=0 |
| | Set the number of taps in the filter. More...
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| |
| virtual float | samples_per_symbol () const =0 |
| | Returns the number of sampler per symbol used for the filter. More...
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| |
| virtual float | rolloff () const =0 |
| | Returns the rolloff factor used for the filter. More...
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| |
| virtual int | filter_size () const =0 |
| | Returns the number of taps of the filter. More...
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| |
| virtual void | print_taps ()=0 |
| |
| virtual int | work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)=0 |
| | just like gr::block::general_work, only this arranges to call consume_each for you More...
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| |
| void | forecast (int noutput_items, gr_vector_int &ninput_items_required) |
| | Estimate input requirements given output request. More...
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| |
| int | general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
| | compute output items from input items More...
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| |
| int | fixed_rate_ninput_to_noutput (int ninput) |
| | Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. More...
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| |
| int | fixed_rate_noutput_to_ninput (int noutput) |
| | Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. More...
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| |
| virtual | ~block () |
| |
| unsigned | history () const |
| |
| void | set_history (unsigned history) |
| |
| void | declare_sample_delay (int which, unsigned delay) |
| |
| void | declare_sample_delay (unsigned delay) |
| |
| unsigned | sample_delay (int which) const |
| |
| bool | fixed_rate () const |
| | Return true if this block has a fixed input to output rate. More...
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| |
| virtual bool | start () |
| | Called to enable drivers, etc for i/o devices. More...
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| |
| virtual bool | stop () |
| | Called to disable drivers, etc for i/o devices. More...
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| |
| void | set_output_multiple (int multiple) |
| | Constrain the noutput_items argument passed to forecast and general_work. More...
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| |
| int | output_multiple () const |
| |
| bool | output_multiple_set () const |
| |
| void | set_alignment (int multiple) |
| | Constrains buffers to work on a set item alignment (for SIMD) More...
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| |
| int | alignment () const |
| |
| void | set_unaligned (int na) |
| |
| int | unaligned () const |
| |
| void | set_is_unaligned (bool u) |
| |
| bool | is_unaligned () const |
| |
| void | consume (int which_input, int how_many_items) |
| | Tell the scheduler how_many_items of input stream which_input were consumed. More...
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| |
| void | consume_each (int how_many_items) |
| | Tell the scheduler how_many_items were consumed on each input stream. More...
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| |
| void | produce (int which_output, int how_many_items) |
| | Tell the scheduler how_many_items were produced on output stream which_output. More...
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| |
| void | set_relative_rate (double relative_rate) |
| | Set the approximate output rate / input rate. More...
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| |
| void | set_inverse_relative_rate (double inverse_relative_rate) |
| | Set the approximate output rate / input rate using its reciprocal. More...
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| |
| void | set_relative_rate (uint64_t interpolation, uint64_t decimation) |
| | Set the approximate output rate / input rate as an integer ratio. More...
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| |
| double | relative_rate () const |
| | return the approximate output rate / input rate More...
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| |
| uint64_t | relative_rate_i () const |
| | return the numerator, or interpolation rate, of the approximate output rate / input rate More...
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| |
| uint64_t | relative_rate_d () const |
| | return the denominator, or decimation rate, of the approximate output rate / input rate More...
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| |
| mpq_class & | mp_relative_rate () |
| | return a reference to the multiple precision rational represntation of the approximate output rate / input rate More...
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| |
| uint64_t | nitems_read (unsigned int which_input) |
| | Return the number of items read on input stream which_input. More...
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| |
| uint64_t | nitems_written (unsigned int which_output) |
| | Return the number of items written on output stream which_output. More...
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| |
| tag_propagation_policy_t | tag_propagation_policy () |
| | Asks for the policy used by the scheduler to moved tags downstream. More...
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| |
| void | set_tag_propagation_policy (tag_propagation_policy_t p) |
| | Set the policy by the scheduler to determine how tags are moved downstream. More...
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| |
| int | min_noutput_items () const |
| | Return the minimum number of output items this block can produce during a call to work. More...
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| |
| void | set_min_noutput_items (int m) |
| | Set the minimum number of output items this block can produce during a call to work. More...
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| |
| int | max_noutput_items () |
| | Return the maximum number of output items this block will handle during a call to work. More...
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| |
| void | set_max_noutput_items (int m) |
| | Set the maximum number of output items this block will handle during a call to work. More...
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| |
| void | unset_max_noutput_items () |
| | Clear the switch for using the max_noutput_items value of this block. More...
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| |
| bool | is_set_max_noutput_items () |
| | Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work. More...
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| |
| void | expand_minmax_buffer (int port) |
| |
| long | max_output_buffer (size_t i) |
| | Returns max buffer size on output port i. More...
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| |
| void | set_max_output_buffer (long max_output_buffer) |
| | Request limit on max buffer size on all output ports. More...
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| |
| void | set_max_output_buffer (int port, long max_output_buffer) |
| | Request limit on max buffer size on output port port. More...
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| |
| long | min_output_buffer (size_t i) |
| | Returns min buffer size on output port i. More...
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| |
| void | set_min_output_buffer (long min_output_buffer) |
| | Request limit on the minimum buffer size on all output ports. More...
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| |
| void | set_min_output_buffer (int port, long min_output_buffer) |
| | Request limit on min buffer size on output port port. More...
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| |
| float | pc_noutput_items () |
| | Gets instantaneous noutput_items performance counter. More...
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| |
| float | pc_noutput_items_avg () |
| | Gets average noutput_items performance counter. More...
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| |
| float | pc_noutput_items_var () |
| | Gets variance of noutput_items performance counter. More...
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| |
| float | pc_nproduced () |
| | Gets instantaneous num items produced performance counter. More...
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| |
| float | pc_nproduced_avg () |
| | Gets average num items produced performance counter. More...
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| |
| float | pc_nproduced_var () |
| | Gets variance of num items produced performance counter. More...
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| |
| float | pc_input_buffers_full (int which) |
| | Gets instantaneous fullness of which input buffer. More...
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| |
| float | pc_input_buffers_full_avg (int which) |
| | Gets average fullness of which input buffer. More...
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| |
| float | pc_input_buffers_full_var (int which) |
| | Gets variance of fullness of which input buffer. More...
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| |
| std::vector< float > | pc_input_buffers_full () |
| | Gets instantaneous fullness of all input buffers. More...
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| |
| std::vector< float > | pc_input_buffers_full_avg () |
| | Gets average fullness of all input buffers. More...
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| |
| std::vector< float > | pc_input_buffers_full_var () |
| | Gets variance of fullness of all input buffers. More...
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| |
| float | pc_output_buffers_full (int which) |
| | Gets instantaneous fullness of which output buffer. More...
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| |
| float | pc_output_buffers_full_avg (int which) |
| | Gets average fullness of which output buffer. More...
|
| |
| float | pc_output_buffers_full_var (int which) |
| | Gets variance of fullness of which output buffer. More...
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| |
| std::vector< float > | pc_output_buffers_full () |
| | Gets instantaneous fullness of all output buffers. More...
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| |
| std::vector< float > | pc_output_buffers_full_avg () |
| | Gets average fullness of all output buffers. More...
|
| |
| std::vector< float > | pc_output_buffers_full_var () |
| | Gets variance of fullness of all output buffers. More...
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| |
| float | pc_work_time () |
| | Gets instantaneous clock cycles spent in work. More...
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| |
| float | pc_work_time_avg () |
| | Gets average clock cycles spent in work. More...
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| |
| float | pc_work_time_var () |
| | Gets average clock cycles spent in work. More...
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| |
| float | pc_work_time_total () |
| | Gets total clock cycles spent in work. More...
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| |
| float | pc_throughput_avg () |
| | Gets average throughput. More...
|
| |
| void | reset_perf_counters () |
| | Resets the performance counters. More...
|
| |
| void | setup_pc_rpc () |
| | Sets up export of perf. counters to ControlPort. Only called by the scheduler. More...
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| |
| bool | is_pc_rpc_set () |
| | Checks if this block is already exporting perf. counters to ControlPort. More...
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| |
| void | no_pc_rpc () |
| | If the block calls this in its constructor, it's perf. counters will not be exported. More...
|
| |
| void | set_processor_affinity (const std::vector< int > &mask) |
| | Set the thread's affinity to processor core n. More...
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| |
| void | unset_processor_affinity () |
| | Remove processor affinity to a specific core. More...
|
| |
| std::vector< int > | processor_affinity () |
| | Get the current processor affinity. More...
|
| |
| int | active_thread_priority () |
| | Get the current thread priority in use. More...
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| |
| int | thread_priority () |
| | Get the current thread priority stored. More...
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| |
| int | set_thread_priority (int priority) |
| | Set the current thread priority. More...
|
| |
| bool | update_rate () const |
| |
| void | system_handler (pmt::pmt_t msg) |
| | the system message handler More...
|
| |
| void | set_log_level (std::string level) |
| | Set the logger's output level. More...
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| |
| std::string | log_level () |
| | Get the logger's output level. More...
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| |
| bool | finished () |
| | returns true when execution has completed due to a message connection More...
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| |
| block_detail_sptr | detail () const |
| |
| void | set_detail (block_detail_sptr detail) |
| |
| void | notify_msg_neighbors () |
| | Tell msg neighbors we are finished. More...
|
| |
| void | clear_finished () |
| | Make sure we don't think we are finished. More...
|
| |
| std::string | identifier () const |
| |
| pmt::pmt_t | message_subscribers (pmt::pmt_t port) |
| |
| virtual | ~basic_block () |
| |
| long | unique_id () const |
| |
| long | symbolic_id () const |
| |
| std::string | name () const |
| |
| std::string | symbol_name () const |
| |
| std::string | identifier () const |
| |
| gr::io_signature::sptr | input_signature () const |
| |
| gr::io_signature::sptr | output_signature () const |
| |
| basic_block_sptr | to_basic_block () |
| |
| bool | alias_set () const |
| |
| std::string | alias () const |
| |
| pmt::pmt_t | alias_pmt () const |
| |
| void | set_block_alias (std::string name) |
| |
| void | message_port_register_in (pmt::pmt_t port_id) |
| |
| void | message_port_register_out (pmt::pmt_t port_id) |
| |
| void | message_port_pub (pmt::pmt_t port_id, pmt::pmt_t msg) |
| |
| void | message_port_sub (pmt::pmt_t port_id, pmt::pmt_t target) |
| |
| void | message_port_unsub (pmt::pmt_t port_id, pmt::pmt_t target) |
| |
| virtual bool | message_port_is_hier (pmt::pmt_t port_id) |
| |
| virtual bool | message_port_is_hier_in (pmt::pmt_t port_id) |
| |
| virtual bool | message_port_is_hier_out (pmt::pmt_t port_id) |
| |
| pmt::pmt_t | message_ports_in () |
| | Get input message port names. More...
|
| |
| pmt::pmt_t | message_ports_out () |
| | Get output message port names. More...
|
| |
| void | _post (pmt::pmt_t which_port, pmt::pmt_t msg) |
| |
| bool | empty_p (pmt::pmt_t which_port) |
| | is the queue empty? More...
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| |
| bool | empty_p () |
| |
| bool | empty_handled_p (pmt::pmt_t which_port) |
| | are all msg ports with handlers empty? More...
|
| |
| bool | empty_handled_p () |
| |
| size_t | nmsgs (pmt::pmt_t which_port) |
| | How many messages in the queue? More...
|
| |
| void | insert_tail (pmt::pmt_t which_port, pmt::pmt_t msg) |
| |
| pmt::pmt_t | delete_head_nowait (pmt::pmt_t which_port) |
| |
| msg_queue_t::iterator | get_iterator (pmt::pmt_t which_port) |
| |
| void | erase_msg (pmt::pmt_t which_port, msg_queue_t::iterator it) |
| |
| virtual bool | has_msg_port (pmt::pmt_t which_port) |
| |
| const msg_queue_map_t & | get_msg_map (void) const |
| |
| virtual void | setup_rpc () |
| | Set up the RPC registered variables. More...
|
| |
| bool | is_rpc_set () |
| | Ask if this block has been registered to the RPC. More...
|
| |
| void | rpc_set () |
| | When the block is registered with the RPC, set this. More...
|
| |
| virtual bool | check_topology (int ninputs, int noutputs) |
| | Confirm that ninputs and noutputs is an acceptable combination. More...
|
| |
| template<typename T > |
| void | set_msg_handler (pmt::pmt_t which_port, T msg_handler) |
| | Set the callback that is fired when messages are available. More...
|
| |
| | msg_accepter () |
| |
| | ~msg_accepter () |
| |
| void | post (pmt::pmt_t which_port, pmt::pmt_t msg) |
| | send msg to msg_accepter on port which_port More...
|
| |
| | msg_accepter () |
| |
| | control_loop (void) |
| |
| | control_loop (float loop_bw, float max_freq, float min_freq) |
| |
| virtual | ~control_loop () |
| |
| void | update_gains () |
| | Update the system gains from the loop bandwidth and damping factor. More...
|
| |
| void | advance_loop (float error) |
| | Advance the control loop based on the current gain settings and the inputted error signal. More...
|
| |
| void | phase_wrap () |
| | Keep the phase between -2pi and 2pi. More...
|
| |
| void | frequency_limit () |
| | Keep the frequency between d_min_freq and d_max_freq. More...
|
| |
| virtual void | set_loop_bandwidth (float bw) |
| | Set the loop bandwidth. More...
|
| |
| void | set_damping_factor (float df) |
| | Set the loop damping factor. More...
|
| |
| void | set_alpha (float alpha) |
| | Set the loop gain alpha. More...
|
| |
| void | set_beta (float beta) |
| | Set the loop gain beta. More...
|
| |
| void | set_frequency (float freq) |
| | Set the control loop's frequency. More...
|
| |
| void | set_phase (float phase) |
| | Set the control loop's phase. More...
|
| |
| void | set_max_freq (float freq) |
| | Set the control loop's maximum frequency. More...
|
| |
| void | set_min_freq (float freq) |
| | Set the control loop's minimum frequency. More...
|
| |
| float | get_loop_bandwidth () const |
| | Returns the loop bandwidth. More...
|
| |
| float | get_damping_factor () const |
| | Returns the loop damping factor. More...
|
| |
| float | get_alpha () const |
| | Returns the loop gain alpha. More...
|
| |
| float | get_beta () const |
| | Returns the loop gain beta. More...
|
| |
| float | get_frequency () const |
| | Get the control loop's frequency estimate. More...
|
| |
| float | get_phase () const |
| | Get the control loop's phase estimate. More...
|
| |
| float | get_max_freq () const |
| | Get the control loop's maximum frequency. More...
|
| |
| float | get_min_freq () const |
| | Get the control loop's minimum frequency. More...
|
| |
Frequency Lock Loop using band-edge filters.
The frequency lock loop derives a band-edge filter that covers the upper and lower bandwidths of a digitally-modulated signal. The bandwidth range is determined by the excess bandwidth (e.g., rolloff factor) of the modulated signal. The placement in frequency of the band-edges is determined by the oversampling ratio (number of samples per symbol) and the excess bandwidth. The size of the filters should be fairly large so as to average over a number of symbols.
The FLL works by filtering the upper and lower band edges into x_u(t) and x_l(t), respectively. These are combined to form cc(t) = x_u(t) + x_l(t) and ss(t) = x_u(t) - x_l(t). Combining these to form the signal e(t) = Re{cc(t) \times ss(t)^*} (where ^* is the complex conjugate) provides an error signal at the DC term that is directly proportional to the carrier frequency. We then make a second-order loop using the error signal that is the running average of e(t).
In practice, the above equation can be simplified by just comparing the absolute value squared of the output of both filters: abs(x_l(t))^2 - abs(x_u(t))^2 = norm(x_l(t)) - norm(x_u(t)).
In theory, the band-edge filter is the derivative of the matched filter in frequency, (H_be(f) = frac{H(f)}{df}). In practice, this comes down to a quarter sine wave at the point of the matched filter's rolloff (if it's a raised-cosine, the derivative of a cosine is a sine). Extend this sine by another quarter wave to make a half wave around the band-edges is equivalent in time to the sum of two sinc functions. The baseband filter for the band edges is therefore derived from this sum of sincs. The band edge filters are then just the baseband signal modulated to the correct place in frequency. All of these calculations are done in the 'design_filter' function.
Note: We use FIR filters here because the filters have to have a flat phase response over the entire frequency range to allow their comparisons to be valid.
It is very important that the band edge filters be the derivatives of the pulse shaping filter, and that they be linear phase. Otherwise, the variance of the error will be very large.
Public Types inherited from gr::block
1.8.13