Classes
class	additive_scrambler_bb
	Scramble an input stream using an LFSR. More...

class	binary_slicer_fb
	Slice float binary symbol producing 1 bit output. More...

class	clock_recovery_mm_cc
	Mueller and Müller (M&M) based clock recovery block with complex input, complex output. More...

class	clock_recovery_mm_ff
	Mueller and Müller (M&M) based clock recovery block with float input, float output. More...

class	cma_equalizer_cc
	Implements constant modulus adaptive filter on complex stream. More...

class	constellation
	An abstracted constellation object. More...

class	constellation_calcdist
	Calculate Euclidian distance for any constellation. More...

class	constellation_sector
	Sectorized digital constellation. More...

class	constellation_rect
	Rectangular digital constellationOnly implemented for 1-(complex)dimensional constellation. More...

class	constellation_expl_rect
	Rectangular digital constellation. More...

class	constellation_psk
	constellation_pskConstellation space is divided into pie slices sectors. More...

class	constellation_bpsk
	Digital constellation for BPSK . More...

class	constellation_qpsk
	Digital constellation for QPSK. More...

class	constellation_dqpsk
	Digital constellation for DQPSK. More...

class	constellation_8psk
	Digital constellation for 8PSK. More...

class	constellation_decoder_cb
	Constellation Decoder. More...

class	constellation_receiver_cb
	This block makes hard decisions about the received symbols (using a constellation object) and also fine tunes phase synchronization. More...

class	constellation_soft_decoder_cf
	Constellation Decoder. More...

class	correlate_access_code_bb
	Examine input for specified access code, one bit at a time. More...

class	correlate_access_code_bb_ts
	Examine input for specified access code, one bit at a time. More...

class	correlate_access_code_ff_ts
	Examine input for specified access code, one bit at a time. More...

class	correlate_access_code_tag_bb
	Examine input for specified access code, one bit at a time. More...

class	correlate_and_sync_cc
	Correlate to a preamble and send time/phase sync info. More...

class	costas_loop_cc
	A Costas loop carrier recovery module. More...

class	cpmmod_bc
	Generic CPM modulator. More...

class	crc32_async_bb
	Byte-stream CRC block for async messages. More...

class	crc32_bb
	Byte-stream CRC block. More...

class	descrambler_bb
	Descramber an input stream using an LFSR. More...

class	diff_decoder_bb
	Differential encoder: y[0] = (x[0] - x[-1]) % M. More...

class	diff_encoder_bb
	Differential decoder: y[0] = (x[0] + y[-1]) % M. More...

class	diff_phasor_cc
	Differential decoding based on phase change. More...

class	fll_band_edge_cc
	Frequency Lock Loop using band-edge filters. More...

class	framer_sink_1
	Given a stream of bits and access_code flags, assemble packets. More...

class	glfsr
	Galois Linear Feedback Shift Register using specified polynomial mask. More...

class	glfsr_source_b
	Galois LFSR pseudo-random source. More...

class	glfsr_source_f
	Galois LFSR pseudo-random source generating float outputs -1.0 - 1.0. More...

class	hdlc_deframer_bp
	HDLC deframer which takes in unpacked bits, and outputs PDU binary blobs. Frames which do not pass CRC are rejected. More...

class	hdlc_framer_pb
	HDLC framer which takes in PMT binary blobs and outputs HDLC frames as unpacked bits, with CRC and bit stuffing added. The first sample of the frame is tagged with the tag frame_tag_name and includes a length field for tagged_stream use. More...

class	header_payload_demux
	Header/Payload demuxer. More...

class	kurtotic_equalizer_cc
	Implements a kurtosis-based adaptive equalizer on complex stream. More...

class	lfsr
	Fibonacci Linear Feedback Shift Register using specified polynomial mask. More...

class	lms_dd_equalizer_cc
	Least-Mean-Square Decision Directed Equalizer (complex in/out) More...

class	map_bb
	output[i] = map[input[i]] More...

class	mpsk_receiver_cc
	This block takes care of receiving M-PSK modulated signals through phase, frequency, and symbol synchronization. More...

class	mpsk_snr_est
	A parent class for SNR estimators, specifically for M-PSK signals in AWGN channels. More...

class	mpsk_snr_est_simple
	SNR Estimator using simple mean/variance estimates. More...

class	mpsk_snr_est_skew
	SNR Estimator using skewness correction. More...

class	mpsk_snr_est_m2m4
	SNR Estimator using 2nd and 4th-order moments. More...

class	snr_est_m2m4
	SNR Estimator using 2nd and 4th-order moments. More...

class	mpsk_snr_est_svr
	Signal-to-Variation Ratio SNR Estimator. More...

class	mpsk_snr_est_cc
	A block for computing SNR of a signal. More...

class	ofdm_carrier_allocator_cvc
	Create frequency domain OFDM symbols from complex values, add pilots. More...

class	ofdm_chanest_vcvc
	Estimate channel and coarse frequency offset for OFDM from preamblesInput: OFDM symbols (in frequency domain). The first one (or two) symbols are expected to be synchronisation symbols, which are used to estimate the coarse freq offset and the initial equalizer taps (these symbols are removed from the stream). The following `n_data_symbols` are passed through unmodified (the actual equalisation must be done elsewhere). Output: The data symbols, without the synchronisation symbols. The first data symbol passed through has two tags: 'ofdm_sync_carr_offset' (integer), the coarse frequency offset as number of carriers, and 'ofdm_sync_eq_taps' (complex vector). Any tags attached to the synchronisation symbols are attached to the first data symbol. All other tags are propagated as expected. More...

class	ofdm_cyclic_prefixer
	Adds a cyclic prefix and performs pulse shaping on OFDM symbols. More...

class	ofdm_equalizer_base

class	ofdm_equalizer_1d_pilots

class	ofdm_equalizer_simpledfe

class	ofdm_equalizer_static

class	ofdm_frame_acquisition
	take a vector of complex constellation points in from an FFT and performs a correlation and equalization. More...

class	ofdm_frame_equalizer_vcvc
	OFDM frame equalizer. More...

class	ofdm_frame_sink
	Takes an OFDM symbol in, demaps it into bits of 0's and 1's, packs them into packets, and sends to to a message queue sink. More...

class	ofdm_insert_preamble
	insert "pre-modulated" preamble symbols before each payload. More...

class	ofdm_mapper_bcv
	take a stream of bytes in and map to a vector of complex constellation points suitable for IFFT input to be used in an ofdm modulator. More...

class	ofdm_sampler
	does the rest of the OFDM stuff More...

class	ofdm_serializer_vcc
	Serializes complex modulations symbols from OFDM sub-carriers. More...

class	ofdm_sync_sc_cfb
	Schmidl & Cox synchronisation for OFDM. More...

class	packet_header_default
	Default header formatter for digital packet transmission. More...

class	packet_header_ofdm
	Header utility for OFDM signals. More...

class	packet_headergenerator_bb
	Generates a header for a tagged, streamed packet. More...

class	packet_headerparser_b
	Post header metadata as a PMT. More...

class	packet_sink
	process received bits looking for packet sync, header, and process bits into packet More...

class	pfb_clock_sync_ccf
	Timing synchronizer using polyphase filterbanks. More...

class	pfb_clock_sync_fff
	Timing synchronizer using polyphase filterbanks. More...

class	pn_correlator_cc
	PN code sequential search correlator. More...

class	probe_density_b

class	probe_mpsk_snr_est_c
	A probe for computing SNR of a signal. More...

class	scrambler_bb
	Scramble an input stream using an LFSR. More...

class	simple_correlator
	inverse of simple_framer (more or less) More...

class	simple_framer
	add sync field, seq number and command field to payload More...

class	chunks_to_symbols_bc
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

class	chunks_to_symbols_bf
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

class	chunks_to_symbols_ic
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

class	chunks_to_symbols_if
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

class	chunks_to_symbols_sc
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

class	chunks_to_symbols_sf
	Map a stream of unpacked symbol indexes to stream of float or complex constellation points in D dimensions (D = 1 by default) More...

Enumerations
enum	trellis_metric_type_t { TRELLIS_EUCLIDEAN = 200, TRELLIS_HARD_SYMBOL, TRELLIS_HARD_BIT }

enum	snr_est_type_t { SNR_EST_SIMPLE = 0, SNR_EST_SKEW, SNR_EST_M2M4, SNR_EST_SVR }
	A block for computing SNR of a signal. More...

Functions
DIGITAL_API unsigned int	update_crc32 (unsigned int crc, const unsigned char *buf, size_t len)
	update running CRC-32 More...

DIGITAL_API unsigned int	update_crc32 (unsigned int crc, const std::string buf)

DIGITAL_API unsigned int	crc32 (const unsigned char *buf, size_t len)

DIGITAL_API unsigned int	crc32 (const std::string buf)

Variables
static const unsigned long long	GRSF_SYNC = 0xacdda4e2f28c20fcULL

static const int	GRSF_BITS_PER_BYTE = 8

static const int	GRSF_SYNC_OVERHEAD = sizeof(GRSF_SYNC)

static const int	GRSF_PAYLOAD_OVERHEAD = 1

static const int	GRSF_TAIL_PAD = 1

static const int	GRSF_OVERHEAD = GRSF_SYNC_OVERHEAD + GRSF_PAYLOAD_OVERHEAD + GRSF_TAIL_PAD

Enumeration Type Documentation

enum gr::digital::trellis_metric_type_t

Enumerator
TRELLIS_EUCLIDEAN
TRELLIS_HARD_SYMBOL
TRELLIS_HARD_BIT

Function Documentation

DIGITAL_API unsigned int gr::digital::crc32	(	const unsigned char *	buf,
		size_t	len
	)

DIGITAL_API unsigned int gr::digital::crc32 ( const std::string buf )

DIGITAL_API unsigned int gr::digital::update_crc32	(	unsigned int	crc,
		const std::string	buf
	)

Variable Documentation

const int gr::digital::GRSF_BITS_PER_BYTE = 8

static

const int gr::digital::GRSF_OVERHEAD = GRSF_SYNC_OVERHEAD + GRSF_PAYLOAD_OVERHEAD + GRSF_TAIL_PAD

static

const int gr::digital::GRSF_PAYLOAD_OVERHEAD = 1

static

const unsigned long long gr::digital::GRSF_SYNC = 0xacdda4e2f28c20fcULL

static

Here are a couple of maximum length sequences (m-sequences) that were generated by the the "mseq" matlab/octave code downloaded from: http://www.mathworks.com/matlabcentral/fileexchange/990

31-bit m-sequence:
 0110100100001010111011000111110
 0x690AEC76 (padded on right with a zero)

63-bit m-sequence:
 101011001101110110100100111000101111001010001100001000001111110
     0xACDDA4E2F28C20FC (padded on right with a zero)

const int gr::digital::GRSF_SYNC_OVERHEAD = sizeof(GRSF_SYNC)

static

const int gr::digital::GRSF_TAIL_PAD = 1

static

Classes

Enumerations

Functions

Variables

Enumeration Type Documentation

Function Documentation

Variable Documentation