Generic CPM modulator. More...

#include <digital_cpmmod_bc.h>

Inheritance diagram for digital_cpmmod_bc:

Public Member Functions
std::vector< float >	get_taps ()
	Return the phase response FIR taps.
Public Member Functions inherited from gr_hier_block2
virtual	~gr_hier_block2 ()
opaque_self	self ()
	Return an object, representing the current block, which can be passed to connect.
void	connect (gr_basic_block_sptr block)
	Add a stand-alone (possibly hierarchical) block to internal graph.
void	connect (gr_basic_block_sptr src, int src_port, gr_basic_block_sptr dst, int dst_port)
	Add gr-blocks or hierarchical blocks to internal graph and wire together.
void	disconnect (gr_basic_block_sptr block)
	Remove a gr-block or hierarchical block from the internal flowgraph.
void	disconnect (gr_basic_block_sptr src, int src_port, gr_basic_block_sptr dst, int dst_port)
	Disconnect a pair of gr-blocks or hierarchical blocks in internal flowgraph.
void	disconnect_all ()
	Disconnect all connections in the internal flowgraph.
virtual void	lock ()
virtual void	unlock ()
gr_flat_flowgraph_sptr	flatten () const
gr_hier_block2_sptr	to_hier_block2 ()
Public Member Functions inherited from gr_basic_block
virtual	~gr_basic_block ()
long	unique_id () const
std::string	name () const
gr_io_signature_sptr	input_signature () const
gr_io_signature_sptr	output_signature () const
gr_basic_block_sptr	to_basic_block ()
virtual bool	check_topology (int ninputs, int noutputs)
	Confirm that ninputs and noutputs is an acceptable combination.
template<typename T >
void	set_msg_handler (T msg_handler)
	Set the callback that is fired when messages are available.
Public Member Functions inherited from gr_msg_accepter
	gr_msg_accepter ()
	~gr_msg_accepter ()
void	post (pmt::pmt_t msg)
	send `msg` to `msg_accepter`
Public Member Functions inherited from gruel::msg_accepter
	msg_accepter ()
virtual	~msg_accepter ()

Protected Member Functions
	digital_cpmmod_bc (gr_cpm::cpm_type type, float h, unsigned samples_per_sym, unsigned L, double beta)
Protected Member Functions inherited from gr_hier_block2
	gr_hier_block2 (void)
	gr_hier_block2 (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature)
Protected Member Functions inherited from gr_basic_block
	gr_basic_block (void)
	gr_basic_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature)
	Protected constructor prevents instantiation by non-derived classes.
void	set_input_signature (gr_io_signature_sptr iosig)
	may only be called during constructor
void	set_output_signature (gr_io_signature_sptr iosig)
	may only be called during constructor
void	set_color (vcolor color)
	Allow the flowgraph to set for sorting and partitioning.
vcolor	color () const

Friends
DIGITAL_API digital_cpmmod_bc_sptr	digital_make_cpmmod_bc (int type, float h, unsigned samples_per_sym, unsigned L, double beta)

Additional Inherited Members
Public Types inherited from gr_hier_block2
typedef gr_basic_block_sptr	opaque_self
	typedef for object returned from self().

Detailed Description

Generic CPM modulator.

Parameters:

type	The modulation type. Can be one of LREC, LRC, LSRC, TFM or GAUSSIAN. See gr_cpm::phase_response() for a detailed description.
h	The modulation index. $h \cdot \pi$ is the maximum phase change that can occur between two symbols, i.e., if you only send ones, the phase will increase by $h \cdot \pi$ every `samples_per_sym` samples. Set this to 0.5 for Minimum Shift Keying variants.
samples_per_sym	Samples per symbol.
L	The length of the phase duration in symbols. For L=1, this yields full- response CPM symbols, for L > 1, partial-response.
beta	For LSRC, this is the rolloff factor. For Gaussian pulses, this is the 3 dB time-bandwidth product.

Examples:

Setting h = 0.5, L = 1, type = LREC yields MSK.
Setting h = 0.5, type = GAUSSIAN and beta = 0.3 yields GMSK as used in GSM.

The input of this block are symbols from an M-ary alphabet +/-1, +/-3, ..., +/-(M-1). Usually, M = 2 and therefore, the valid inputs are +/-1. The modulator will silently accept any other inputs, though. The output is the phase-modulated signal.

Constructor & Destructor Documentation

digital_cpmmod_bc::digital_cpmmod_bc	(	gr_cpm::cpm_type	type,
		float	h,
		unsigned	samples_per_sym,
		unsigned	L,
		double	beta
	)

protected

Member Function Documentation

std::vector<float> digital_cpmmod_bc::get_taps ( )

inline

Return the phase response FIR taps.

Friends And Related Function Documentation

DIGITAL_API digital_cpmmod_bc_sptr digital_make_cpmmod_bc	(	int	type,
		float	h,
		unsigned	samples_per_sym,
		unsigned	L,
		double	beta
	)

friend

The documentation for this class was generated from the following file:

digital_cpmmod_bc.h

Public Member Functions

Protected Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation