Version 1.6.0

Version 1.6.0 includes a new qdsync object to greatly simplify the frame synchronization process in liquid, allowing for both detection and channel impairment correction with a simplified interface. Additionally, code coverage has been increased to 85% across the entire project, with numerous bug fixes, stability improvements, and massive testing enhancements. From an "architectural" standpoint, objects have been migrated to use standard methods for consistency.

• build
  • increased code coverage to 85% globally across entire project. This
    is the single largest effort included in this version and touches
    most modules in some way, most particularly the framing objects
  • cleaning build to remove compiler warnings (e.g. unused variables)
  • stripped version number off archive
• dotprod
  • added support for AVX512-F (thanks, @vankxr!)
• framing
  • added numerous tests to increase coverage to 84%
  • framesync64: using new qdsync object for simplified operation
  • qdsync: new frame detector and synchronizer to much more easily
    support frame processing. The object not only detects the frame, but
    also provides an initial carrier frequency, phase, and timign offset,
    and also corrects for these impairments, passing the results to the
    user in a clean callback function.
• modem
  • cpfskmod: increasing phase stability for long runs
• multichannel
  • added numerous tests to increase coverage to 88%
• optim
  • added numerous tests to increase coverage to 92%
• sequence
  • msequence: extended support for state variables up to m=31, reversed
    order for generator polynomial and internal state definition to be
    more consistent with literature and readily-available genpolys

Version 1.5.0

This release includes substantially improved testing coverage, deep copy() methods for nearly all objects, improved speed, and resolves a number of issues and pull requests.

• build
  • added support for PlatformIO for embeedded
    development (thanks, @jcw!)
  • incorporated recursive copy() methods to objects to facilitate c++ copy
    constructors for bindings; now all objects can be deep copied to a new
    object with their entire memory and state preserved
  • added convenience method to malloc and copy memory arrays
  • improved support for error codes across objects and methods
  • cleaned up spelling errors across project (thanks, @nowls!)
  • scrubbed function argument variable names to avoid underscore followed
    by a capital letter, causing trouble with pre-compiler processing
  • added basic test to check linking to installed library, incorporating
    into CI/CD pipelines
  • added more example programs
• autotest
  • increased coverage testing (81% across entire project)
  • added the ability to "hammer" a particular test by running repeatedly on
    incremental seeds to assess specific edge cases (e.g. with random data)
  • added timer to show execution time for each test and identify areas for
    speed improvements
  • added methods for testing spectral response of various fields
  • added special directory for storing output logs: autotest/logs/
• benchmark
  • replacing old C-based benchmark comparison with simpler python version
• dotprod
  • added support for AVX SIMD in vector dot products (thanks, @vankxr!)
• fft
  • adding macro to allow for aligned memory allocation if FFTW is used
    (thanks, @nowls!)
• filter
  • added new halfband filter design using Parks-McClellan algorithm and
    qs1dsearch method to provide as exact a specification as possible
  • added method to retrieve filter response from coefficients array
  • dds: adding methods to get/set scale
  • firhilb, iirhilb: added block processing method
  • msresamp, resamp: adding method to provide the exact number of output
    samples with provided input size
  • msresamp2, resamp2: using better halfband filter design for exact user
    specifications
  • resamp: adding methods to get/set scale, fixing filter bank resolution
    (was hard-coded, now respects user configuration)
• framing
  • framesync64: added methods to set callback and userdata (context)
    fields, adding support for exporting debugging files for post-analysis
    as well as python script for processing, adding better estimate of
    error vector magnitude
  • msource: added convenience method to recall number of samples generated
    by each source
  • ofdmflexframesync: added methods to set callback and userdata (context)
    fields
  • qpacketmodem: returning much better estimate of error vector magnitude
  • qsource: fixed issue with carrier frequency adjustment
• optim
  • added qs1dsearch object to perform quad-section 1-dimensional search:
    similar to bisection search, but to find potentially non-continuous
    minimum/maximum of function

Version 1.4.0

This release includes a number of new objects, new methods for existing objects, better support for error handling, integrated GitHub workflows for testing & code coverage, and general stability enhancements:

• autotest
  • automated code coverage testing (72%)
• build
  • incorporated error handling in most methods with integer-based return value
• agc
  • added interface to check if AGC is locked or not
• buffer
  • cbuffer: added method to check if buffer is empty
• dotprod
  • included methods to create/recreate object in reverse order
• equalization
  • eqlms: added convenience methods for copying coefficients and running as
    a decimator
• fft
  • spgram: adding convenience methods for getting/setting properties
  • spwaterfall: adding convenience methods for getting/setting properties
• filter
  • new direct digital synthesis (DDS) family of objects which allows
    cascaded half-band interpolation/decimation with arbitrary frequency
    translation
  • new fractional delay (fdelay) family of objects which allow for
    adjustable large fractional delays
  • firdecim: adding convenience method to get decimation rate
  • firfilt: adding convenience methods to get/copy coefficients as well as
    create object using firdespm algorithm
  • firinterp: adding convenience methods for new ways to create object as
    well as getting object properties
  • firpfb: adding convenience methods to create default object, write
    samples
  • resamp2: adding methods to get/set output scale
  • rresamp: adding methods to operate with block execution
• framing
  • new arbitrary rate symstreamr object (derived from symstream family)
  • framesync64: adding methods for getting/resetting frame data statistics
    as well as getting/setting detection threshold
  • gmskframegen/gmskframesync: extending methods to support easier
    operation, getting/resetting frame data statistics, more control over
    parameters in create methods
  • ofdmflexframesync: adding methods to get/reset frame data statistics
  • qdetector: adding method to get threshold
  • qpilotsync: adding method to get error vector magnitude
  • symstream: adding convenience methods for getting properties
  • symtrack: adding convenience methods for getting/setting properties
• math
  • adding liquid_ prefix to winodowing functions while supporting backwards
    compatibility with older methods
  • adding liquid_ prefix to internal polynomial functions, using
    common double-precision method for finding polynomial roots
• multichannel
  • firpfbch2: adding convenience methods to get object properties
• modem
  • modem: adding type extension for more consistency: modem -> modemcf,
    supporting backwards compatibility with API shim