Carrier tracking PLL for QPSKinput: complex; output: complex
The Costas loop can have two output streams: stream 1 is the baseband I and Q; stream 2 is the normalized frequency of the loop.
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#include <gr_costas_loop_cc.h>
Public Member Functions | |
| void | set_alpha (float alpha) |
| set the first order gain | |
| float | alpha () const |
| get the first order gain | |
| void | set_beta (float beta) |
| set the second order gain | |
| float | beta () const |
| get the second order gain | |
| int | work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) |
| just like gr_block::general_work, only this arranges to call consume_each for you | |
| float | freq () const |
| returns the current NCO frequency in radians/sample | |
Friends | |
| gr_costas_loop_cc_sptr | gr_make_costas_loop_cc (float alpha, float beta, float max_freq, float min_freq, int order) throw (std::invalid_argument) |
Detailed Description
Carrier tracking PLL for QPSK
input: complex; output: complex
The Costas loop can have two output streams: stream 1 is the baseband I and Q; stream 2 is the normalized frequency of the loop.
order must be 2 or 4.
Member Function Documentation
| float gr_costas_loop_cc::alpha | ( | ) | const [inline] |
get the first order gain
| float gr_costas_loop_cc::beta | ( | ) | const [inline] |
get the second order gain
| float gr_costas_loop_cc::freq | ( | ) | const [inline] |
returns the current NCO frequency in radians/sample
| void gr_costas_loop_cc::set_alpha | ( | float | alpha | ) |
set the first order gain
- Parameters:
-
alpha
| void gr_costas_loop_cc::set_beta | ( | float | beta | ) |
set the second order gain
- Parameters:
-
beta
| int gr_costas_loop_cc::work | ( | int | noutput_items, |
| gr_vector_const_void_star & | input_items, | ||
| gr_vector_void_star & | output_items | ||
| ) | [virtual] |
just like gr_block::general_work, only this arranges to call consume_each for you
The user must override work to define the signal processing code
Implements gr_sync_block.
Friends And Related Function Documentation
| gr_costas_loop_cc_sptr gr_make_costas_loop_cc | ( | float | alpha, |
| float | beta, | ||
| float | max_freq, | ||
| float | min_freq, | ||
| int | order | ||
| ) | throw (std::invalid_argument) [friend] |
The documentation for this class was generated from the following file:
