Generic CPM modulator. More...

#include <gnuradio/digital/cpmmod_bc.h>

Public Types
typedef std::shared_ptr< cpmmod_bc >	sptr

Public Types inherited from gr::hier_block2
typedef basic_block_sptr	opaque_self
	typedef for object returned from self(). More...

Public Member Functions
virtual std::vector< float >	taps () const =0
	Return the phase response FIR taps. More...

virtual int	type () const =0
	Return the type of CPM modulator. More...

virtual float	index () const =0
	Return the modulation index of the modulator. More...

virtual int	samples_per_sym () const =0
	Return the number of samples per symbol. More...

virtual int	length () const =0
	Return the length of the phase duration (in symbols) More...

virtual double	beta () const =0
	Return the value of beta for the modulator. More...

Public Member Functions inherited from gr::hier_block2
	~hier_block2 () override

opaque_self	self ()
	Return an object, representing the current block, which can be passed to connect. More...

void	connect (basic_block_sptr block)
	Add a stand-alone (possibly hierarchical) block to internal graph. More...

void	connect (basic_block_sptr src, int src_port, basic_block_sptr dst, int dst_port)
	Add gr-blocks or hierarchical blocks to internal graph and wire together. More...

void	msg_connect (basic_block_sptr src, pmt::pmt_t srcport, basic_block_sptr dst, pmt::pmt_t dstport)
	Add gr-blocks or hierarchical blocks to internal graph and wire together. More...

void	msg_connect (basic_block_sptr src, std::string srcport, basic_block_sptr dst, std::string dstport)

void	msg_disconnect (basic_block_sptr src, pmt::pmt_t srcport, basic_block_sptr dst, pmt::pmt_t dstport)

void	msg_disconnect (basic_block_sptr src, std::string srcport, basic_block_sptr dst, std::string dstport)

void	disconnect (basic_block_sptr block)
	Remove a gr-block or hierarchical block from the internal flowgraph. More...

void	disconnect (basic_block_sptr src, int src_port, basic_block_sptr dst, int dst_port)
	Disconnect a pair of gr-blocks or hierarchical blocks in internal flowgraph. More...

void	disconnect_all ()
	Disconnect all connections in the internal flowgraph. More...

virtual void	lock ()

virtual void	unlock ()

int	max_output_buffer (size_t port=0)
	Returns max buffer size (itemcount) on output port `i`. More...

void	set_max_output_buffer (int max_output_buffer)
	Sets max buffer size (itemcount) on all output ports. More...

void	set_max_output_buffer (size_t port, int max_output_buffer)
	Sets max buffer size (itemcount) on output port `port`. More...

int	min_output_buffer (size_t port=0)
	Returns min buffer size (itemcount) on output port `i`. More...

void	set_min_output_buffer (int min_output_buffer)
	Sets min buffer size (itemcount) on all output ports. More...

void	set_min_output_buffer (size_t port, int min_output_buffer)
	Sets min buffer size (itemcount) on output port `port`. More...

flat_flowgraph_sptr	flatten () const

hier_block2_sptr	to_hier_block2 ()

bool	has_msg_port (pmt::pmt_t which_port) override

bool	message_port_is_hier (pmt::pmt_t port_id) override

bool	message_port_is_hier_in (pmt::pmt_t port_id) override

bool	message_port_is_hier_out (pmt::pmt_t port_id) override

void	message_port_register_hier_in (pmt::pmt_t port_id)

void	message_port_register_hier_out (pmt::pmt_t port_id)

void	set_processor_affinity (const std::vector< int > &mask) override
	Set the affinity of all blocks in hier_block2 to processor core `n`. More...

void	unset_processor_affinity () override
	Remove processor affinity for all blocks in hier_block2. More...

std::vector< int >	processor_affinity () override
	Get the current processor affinity. More...

void	set_log_level (const std::string &level) override
	Set the logger's output level. More...

std::string	log_level () override
	Get the logger's output level. More...

bool	all_min_output_buffer_p (void)
	Get if all block min buffers should be set. More...

bool	all_max_output_buffer_p (void)
	Get if all block max buffers should be set. More...

Public Member Functions inherited from gr::basic_block
pmt::pmt_t	message_subscribers (pmt::pmt_t port)

	~basic_block () override

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)

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...

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)

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...

Public Member Functions inherited from gr::msg_accepter
	msg_accepter ()

	~msg_accepter () override

void	post (pmt::pmt_t which_port, pmt::pmt_t msg) override
	send `msg` to `msg_accepter` on port `which_port` More...

Public Member Functions inherited from gr::messages::msg_accepter
	msg_accepter ()

Static Public Member Functions
static sptr	make (analog::cpm::cpm_type type, float h, int samples_per_sym, int L, double beta=0.3)

static sptr	make_gmskmod_bc (int samples_per_sym=2, int L=4, double beta=0.3)

Additional Inherited Members
Public Attributes inherited from gr::hier_block2
pmt::pmt_t	hier_message_ports_in

pmt::pmt_t	hier_message_ports_out

Protected Types inherited from gr::basic_block
enum	vcolor { WHITE , GREY , BLACK }

Protected Member Functions inherited from gr::hier_block2
	hier_block2 ()

	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
	basic_block (void)

	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. More...

void	set_input_signature (gr::io_signature::sptr iosig)
	may only be called during constructor More...

void	set_output_signature (gr::io_signature::sptr iosig)
	may only be called during constructor More...

void	set_color (vcolor color)
	Allow the flowgraph to set for sorting and partitioning. More...

vcolor	color () const

virtual bool	has_msg_handler (pmt::pmt_t which_port)
	Tests if there is a handler attached to port `which_port`. More...

virtual void	dispatch_msg (pmt::pmt_t which_port, pmt::pmt_t msg)

template<typename Derived >
std::shared_ptr< Derived >	shared_from_base ()
	This is meant to be called by derived classes (e.g. block) to get a shared pointer internally. This is needed because std::enable_shared_from_this doesn't seem to work with derived classes in an inheritance hierarchy. More...

Protected Attributes inherited from gr::basic_block
std::string	d_name

gr::io_signature::sptr	d_input_signature

gr::io_signature::sptr	d_output_signature

long	d_unique_id

long	d_symbolic_id

std::string	d_symbol_name

std::string	d_symbol_alias

vcolor	d_color

bool	d_rpc_set

gr::logger_ptr	d_logger

gr::logger_ptr	d_debug_logger
	Default logger. More...

msg_queue_map_t	msg_queue
	Verbose logger. More...

std::vector< rpcbasic_sptr >	d_rpc_vars

pmt::pmt_t	d_message_subscribers

Detailed Description

Generic CPM modulator.

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.

Member Typedef Documentation

◆ sptr

typedef std::shared_ptr<cpmmod_bc> gr::digital::cpmmod_bc::sptr

Member Function Documentation

◆ beta()

virtual double gr::digital::cpmmod_bc::beta ( ) const

pure virtual

Return the value of beta for the modulator.

◆ index()

virtual float gr::digital::cpmmod_bc::index ( ) const

pure virtual

Return the modulation index of the modulator.

◆ length()

virtual int gr::digital::cpmmod_bc::length ( ) const

pure virtual

Return the length of the phase duration (in symbols)

◆ make()

static sptr gr::digital::cpmmod_bc::make	(	analog::cpm::cpm_type	type,
		float	h,
		int	samples_per_sym,
		int	L,
		double	beta = `0.3`
	)

static

Make CPM modulator block.

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.

◆ make_gmskmod_bc()

static sptr gr::digital::cpmmod_bc::make_gmskmod_bc	(	int	samples_per_sym = `2`,
		int	L = `4`,
		double	beta = `0.3`
	)

static

Make GMSK modulator block.

The type is GAUSSIAN and the modulation index for GMSK is 0.5. This are populated automatically by this factory function.

Parameters

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.

◆ samples_per_sym()

virtual int gr::digital::cpmmod_bc::samples_per_sym ( ) const

pure virtual

Return the number of samples per symbol.

◆ taps()

virtual std::vector<float> gr::digital::cpmmod_bc::taps ( ) const

pure virtual

Return the phase response FIR taps.

◆ type()

virtual int gr::digital::cpmmod_bc::type ( ) const

pure virtual

Return the type of CPM modulator.

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

cpmmod_bc.h

Public Types

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ sptr

Member Function Documentation

◆ beta()

◆ index()

◆ length()

◆ make()

◆ make_gmskmod_bc()

◆ samples_per_sym()

◆ taps()

◆ type()