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⨍ Functions 128◇ Types & classes 17

↓ 64 callersFunctionmatlab_range

Implement the matlab range notation a:b:c. Ex, 1:2:6 is [1 3 5].

src/itpp_ext.cpp:97

↓ 28 callersFunctiondb10

include/dsp.h:101

↓ 19 callersMethodn_id_cell

Cell class member functions

src/common.cpp:29

↓ 18 callersFunctionmatlab_mod

itpp has a mod function but it only operates like the Matlab mod function on integers. The matlab_mod function defined here should operate exactly lik

include/itpp_ext.h:40

↓ 14 callersFunctionsigpower

include/dsp.h:23

↓ 12 callersMethodn_symb_dl

src/common.cpp:32

↓ 8 callersMethodframe_timing

Read/write frame_timing (via mutex). Only one thread (tracker_thread) can update frame_timing. We only need to ensure that no thread reads a partial v

include/LTE-Tracker.h:129

↓ 8 callersFunctionprint_center

ncurses center justified print of a string

src/display_thread.cpp:94

↓ 6 callersMethodfrequency_offset

Read/write frequency offset (via mutex). Mutex makes sure that no read or write is interrupted when only part of the data has been read.

include/LTE-Tracker.h:181

↓ 6 callersMethodget_shift

Return the requested shift value.

src/lte_lib.cpp:396

↓ 6 callersFunctioninterp1

include/dsp.h:152

↓ 5 callersFunctionextract_psss

Simple helper function to perform FOC and return only the subcarriers occupied by the PSS or SSS. Called by more than one function!

src/searcher.cpp:516

↓ 5 callersFunctionfshift

Shift a vector in frequency itpp::cvec fshift(const itpp::cvec & v,const double f,const double fs); itpp::cvec fshift(const itpp::cvec & v,const doubl

include/dsp.h:40

↓ 5 callersFunctionlast

include/itpp_ext.h:99

↓ 5 callersFunctionudb10

include/dsp.h:111

↓ 4 callersFunctionchan_est

Examine the time/frequency grid and perform channel estimation and filtering to produce channel estimates for every RE. Each invocation of this funct

src/searcher.cpp:1369

↓ 4 callersFunctiondecode_mib

Blindly try various frame alignments and numbers of antennas to try to find a valid MIB.

src/searcher.cpp:1526

↓ 4 callersFunctiondel_oob

Helper function to remove entries that are out of bounds

src/searcher.cpp:1072

↓ 4 callersFunctionextract_tfg

Extract the time/ frequency grid. Note that this function is inefficient in that it returns the time/ frequency grid for nearly all samples in the ca

src/searcher.cpp:857

↓ 4 callersFunctioninterpft

Perform FFT based interpolation. Assuming input signal is cyclically repeating signal sampled at M points, return a cyclically repeating signal that i

↓ 4 callersFunctionpeak_search

Search through all the correlations and determine if any PSS were found.

src/searcher.cpp:422

↓ 4 callersFunctionplot_trace

Helper function to plot a transfer function on the screen.

src/display_thread.cpp:245

↓ 4 callersFunctionpss_sss_foe

Perform FOE using only the PSS and SSS. The PSS correlation peak gives us the frequency offset within 2.5kHz. The PSS/SSS can be used to estimate the

src/searcher.cpp:767

↓ 4 callersFunctionrs_dl_shift_calc

Calculate the shift a certain port will use for a certain ofdm symbol.

src/lte_lib.cpp:327

↓ 4 callersFunctionsss_detect

Detect the SSS, if present

src/searcher.cpp:696

↓ 4 callersFunctionsss_detect_ml_helper

Helper function that compares the received SSS against one of the known transmitted SSS sequences.

src/searcher.cpp:636

↓ 4 callersFunctiontfoec

Perform 'superfine' TOE/FOE/TOC/FOC. First, the residual frequency offset is measured using all the samples in the TFG. This frequency offset will be

src/searcher.cpp:952

↓ 4 callersFunctionxcorr_pss

Correlate the received signal against all possible PSS and all possible frequency offsets. This is the main function that calls all of the previously

src/searcher.cpp:389

↓ 3 callersFunctionblnoise

Currently, this simply returns a vector of complex gaussian noise with zero mean and average power 1.0.

include/dsp.h:143

↓ 3 callersFunctionchi2cdf_inv

Returns the value x such that chi2cdf(x,k) is p.

include/dsp.h:188

↓ 3 callersFunctionflatten

Flatten 3D vector m. Similar to Matlab's m(:) functionality. This should only be used for debugging since it is not very fast.

src/itpp_ext.cpp:37

↓ 3 callersFunctionlte_pn

Implementation of the LTE PN generator. A faster implementation is possible using uint32 to store the state. This function was coded using vectors and

src/lte_lib.cpp:41

↓ 3 callersFunctionrtl_sdr_to_cvec

Read data captured by the rtl_sdr program into a cvec.

src/itpp_ext.cpp:176

↓ 3 callersFunctionslot_sym_inc

Small helper function to increment the slot number and the symbol number.

include/LTE-Tracker.h:255

↓ 2 callersFunctioncapture_data

This function produces a vector of captured data. The data can either come from live data received by the RTLSDR, or from a file containing previously

src/capbuf.cpp:81

↓ 2 callersFunctionce_interp_hex_extend

Helper function. Linearly interpolates the left/right edge samples so as to guarantee a vertex at the left and right subcarrier.

src/searcher.cpp:1200

↓ 2 callersMethodcell_seconds_dropped

include/LTE-Tracker.h:202

↓ 2 callersFunctiondisplay_cell

Display status information for a certain cell on a certain line on the screen.

src/display_thread.cpp:108

↓ 2 callersFunctioninterp72

src/tracker_thread.cpp:372

↓ 2 callersFunctionlte_calc_crc

Calculate one of the LTE CRC's.

src/lte_lib.cpp:637

↓ 2 callersFunctionlte_conv_decode

Note that this function assumes that d_est is ln(P(d_est==0|r)/P(d_est==1|r)) This is different from the matlab function which assumes d_est is simply

src/lte_lib.cpp:538

↓ 2 callersFunctionlte_conv_deratematch

Note that this function assumes that e_est is ln(P(e_est==0|r)/P(e_est==1|r)) This is different from the matlab function which assumes e_est is simply

src/lte_lib.cpp:469

↓ 2 callersFunctionlte_demodulate

Assumes that the channel has already been removed from the received signal and the np is the amount of noise present in each sample. This function ret

src/lte_lib.cpp:612

↓ 2 callersFunctionprint_left

ncurses left justified print of a string

src/display_thread.cpp:83

↓ 2 callersFunctionprint_right

ncurses right justified print of a string

src/display_thread.cpp:72

↓ 2 callersFunctionpss_fd_calc

PSS Return the PSS in the frequency domain.

src/lte_lib.cpp:155

↓ 2 callersMethodraw_seconds_dropped

include/LTE-Tracker.h:211

↓ 2 callersFunctionread_datafile

Read a file either in rtlsdr format or itpp format.

src/LTE-Tracker.cpp:540

↓ 2 callersMethodsearcher_cycle_time

Read/write searcher cycle time (via mutex). Mutex makes sure that no read or write is interrupted when only part of the data has been read.

include/LTE-Tracker.h:193

↓ 2 callersFunctionset_occupied

Indicate that certain rows are occupied

src/display_thread.cpp:228

↓ 2 callersFunctionsss_fd_calc

Calculate the SSS in the frequency domain.

src/lte_lib.cpp:199

↓ 2 callersFunctionwill_fit

Will a certain cell display fit starting at a certain row?

src/display_thread.cpp:215

↓ 1 callersFunctionand_reduce

Logical AND of all the bits. Is there another way to do this???

src/itpp_ext.cpp:153

↓ 1 callersFunctionce_interp_hex

src/searcher.cpp:1223

↓ 1 callersFunctionce_ready

Small helper function returns true if all the fifos contain data.

src/tracker_thread.cpp:480

↓ 1 callersMethodcell_seconds_dropped_inc

include/LTE-Tracker.h:207

↓ 1 callersFunctioncompute_fc_programmed

src/from_osmocom.cpp:113

↓ 1 callersFunctioncompute_flo

src/from_osmocom.cpp:104

↓ 1 callersFunctioncompute_fvco

\brief compute Fvco based on Fosc, Z and X * \returns positive value (Fvco in Hz), 0 in case of error */

src/from_osmocom.cpp:85

↓ 1 callersFunctionconfig_usb

Open the USB device

src/CellSearch.cpp:343

↓ 1 callersFunctionconfig_usb

Open the USB device

src/LTE-Tracker.cpp:442

↓ 1 callersFunctiondedup

In high SNR environments, a cell may be detected on different carrier frequencies and with different frequency offsets. Keep only the cell with the hi

src/CellSearch.cpp:285

↓ 1 callersFunctiondedup

In high SNR environments, a cell may be detected on different carrier frequencies and with different frequency offsets. Keep only the cell with the hi

src/LTE-Tracker.cpp:378

↓ 1 callersFunctiondiff

include/itpp_ext.h:77

↓ 1 callersFunctiondo_ac_fd

Update the frequency domain autocorrelation function.

src/tracker_thread.cpp:318

↓ 1 callersFunctiondo_ac_td

Estimate the time domain autocorrelation function.

src/tracker_thread.cpp:343

↓ 1 callersFunctiondo_foe

src/tracker_thread.cpp:204

↓ 1 callersFunctiondo_mib_decode

src/tracker_thread.cpp:531

↓ 1 callersFunctiondo_pss_sss_sigpower_ce

Measure signal and noise power using the SSS and PSS. More accurate than using the CRS. Also perform channel estimation and store results.

src/tracker_thread.cpp:754

↓ 1 callersFunctiondo_toe_v2

src/tracker_thread.cpp:245

↓ 1 callersFunctionfilter_ce

src/tracker_thread.cpp:176

↓ 1 callersFunctionfreq_formatter

Helper function to assist in formatting frequency offsets.

src/CellSearch.cpp:322

↓ 1 callersFunctionfshift_inplace

include/dsp.h:58

↓ 1 callersFunctionget_fd

Pop 128 time domain samples from the fifo, convert to the frequency domain, and extract the 72 desired subcarriers.

src/tracker_thread.cpp:91

↓ 1 callersFunctioninterp2d

src/tracker_thread.cpp:395

↓ 1 callersFunctionkalibrate

Perform an initial cell search solely for the purpose of calibrating the oscillator. This code can probably be rolled into the searcher so as to elimi

src/LTE-Tracker.cpp:565

↓ 1 callersFunctionlte_conv_ratematch

Perform LTE ratematching for convolutionally encoded bits d to fit an e vector of length n_e.

src/lte_lib.cpp:409

↓ 1 callersFunctionparse_commandline

Parse the command line arguments and return optional parameters as variables. Also performs some basic sanity checks on the parameters.

src/rtl_sdr_check.cpp:78

↓ 1 callersFunctionparse_commandline

Parse the command line arguments and return optional parameters as variables. Also performs some basic sanity checks on the parameters.

src/CellSearch.cpp:92

↓ 1 callersFunctionparse_commandline

Parse the command line arguments and return optional parameters as variables. Also performs some basic sanity checks on the parameters.

src/LTE-Tracker.cpp:114

↓ 1 callersFunctionpbch_extract

Examine the time/ frequency grid and extract the RE that belong to the PBCH. Also return the channel estimates for that RE from all 4 possible eNodeB

src/searcher.cpp:1482

↓ 1 callersFunctionpbch_extract_rt

Similar to pbch_extract but this one works only on MIB samples. The other function has access to all the OFDM symbols.

src/tracker_thread.cpp:494

↓ 1 callersFunctionprint_usage

Simple usage screen.

src/rtl_sdr_check.cpp:47

↓ 1 callersFunctionprint_usage

Simple usage screen.

src/CellSearch.cpp:43

↓ 1 callersFunctionprint_usage

Simple usage screen.

src/LTE-Tracker.cpp:63

↓ 1 callersMethodraw_seconds_dropped_inc

include/LTE-Tracker.h:216

↓ 1 callersFunctionrs_dl_calc

Function to calculate the reference symbols. This function executes rather slowly and hence it is usually better to use the RS_DL class which precompu

src/lte_lib.cpp:305

↓ 1 callersFunctionsp_est

Estimate the received signal power within 2 OFDM symbols of a particular sample. In the 6 center RB's, the transmitted power is the same for all PSS

src/searcher.cpp:185

↓ 1 callersFunctionsss_detect_getce_sss

Perform channel estimation and extract the SSS subcarriers.

src/searcher.cpp:533

↓ 1 callersFunctionsss_detect_ml

Perform maximum likelihood detection on the combined SSS signals.

src/searcher.cpp:655

↓ 1 callersFunctiontshift

Cyclically shift vector to the right by n samples.

include/dsp.h:77

↓ 1 callersFunctionxc_combine

Perform incoherent combining on the correlations. There is no guarantee that PSS/SSS pairs will always be transmitted from the same antenna. Thus, PS

src/searcher.cpp:263

↓ 1 callersFunctionxc_correlate

Correlate the received data against various frequency shifted versions of the three PSS sequences. This is likely to be the slowest routine since it n

src/searcher.cpp:113

↓ 1 callersFunctionxc_delay_spread

Combine adjacent taps that likely come from the same channel. Simply: xc_incoherent(t,idx,foi)=mean(xc_incoherent_single(t,idx-ds_comb_arm:idx+ds_comb

src/searcher.cpp:312

↓ 1 callersFunctionxc_peak_freq

Search for the peak correlation among all frequency offsets. For each time offset and each PSS index, examine the correlations for all of the frequenc

src/searcher.cpp:353

Default constructor initializes structure to impossible values.

src/common.cpp:36

Constructor This was implemented as a class so that the (slow) initialization only needs to be done once, when the program starts.

src/lte_lib.cpp:559

Initialize table

src/lte_lib.cpp:164

Initialize PSS time domain table

src/lte_lib.cpp:177

src/lte_lib.cpp:354

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