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HISTORY
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HISTORY
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Major improvements since v1.2.0
* documentation
- added script to auto-generate code listings when pygmentize
is unavailable (not as good, but still functional)
* dotprod
- adding method to compute x^T * x of a vector (sum of squares)
* fft
- general speed improvements for one-dimensional FFTs
* filter
- add linear interpolation for arbitrary resamp output
- added autotests for validating performance of both the
resamp and msresamp objects
- added new fftfilt family of objects to realize linear filter
with fast Fourier transforms
* framing
- adding generic callback function definition for all framing
structures
- adding pre-demodulator synchronizer/detector
- moved interleaver and packetizer objects to `fec` module
- restructuring frame[gen|sync]64 and flexframe[gen|sync]
objects with vastly improved performance and reliability
* matrix
- adding smatrix family of objects (sparse matrices)
- improving linear solver methods (roughly doubled speed)
* modem
- re-organizing internal modem code (no interface change)
* multicarrier
- adding OFDM framing option for window tapering
- simplfying OFDM framing for generating preamble symbols (all
generated OFDM symbols are the same length)
- adding run-time option for debugging ofdmframesync
* optim
- gradsearch (gradient search) uses internal linesearch for
significant speed increase and better reliability
- gradsearch interface greatly simplified
* vector
- new module to simplify basic vector operations
Major improvements for v1.2.0
* dotprod
- leveraging SIMD extensions for vector operations (SSE2, SSE3)
* fft
- completely re-structured internal transform strategy including
Cooley-Tukey mixed-radix algorithm, Rader algorithm for FFTs of
prime length, and specific codelets for small-size transforms.
* math
- new modular arithmetic methods (prime factor, totient, etc.)
* modem
- new API creates linear modem objects with one argument, e.g.
LIQUID_MODEM_QAM16
- new type definitions for analog modems
Major improvements for v1.1.0
* build
- simplifying build environment by explicitly defining object
dependencies (no longer auto-generated; much faster now)
* documentation
- new tutorials (ofdmflexframe)
- sections on new objects/methods (msresamp, gmsk filter design,
soft-decision demodulation)
- adding useful figures (polyfit-lagrange, symsync)
- adding BER performance plots for new FEC schemes
- adding BER performance plots for sqam32 and sqam128
* agc
- fixing scaling issues
- improving computation speed
- simplifying interface with a single, unified design model
* equalization
- adding support for decision-directed equalizers
* fec
- adding soft decoding (when available) for forward error-correction
schemes; generally improves performance by about 2 dB Eb/N0
- adding half-rate Golay(24,12) code
- adding SEC-DED codes: (22,16), (39,32), (72,64)
* filter
- firdes: adding Nyquist prototyping design method
- firdes: adding new GMSK receive filter design method
- interp: porting to efficient polyphase filterbank implementation,
adding prototype create() method
- adding multi-stage resampler for efficient decimation and
interpolation
* framing
- adding ofdmflexframe family of objects capable of defining which
subcarriers are nulls/pilots/data, and easily loading data into
frames. Very similar to 'flexframe' in usage.
- supporting soft packet decoding (interleaving, etc.)
- adding gmskframe generator and synchronizer object; simple,
reliable
* matrix
- adding Cholesky factorization A = R^T * R (for positive definite
matrices)
- adding conjugate gradient solver (for positive definite matrices)
* modem
- adding simple on/off keying (OOK) type
- adding 256-APSK type (6,18,32,36,46,54,64)
- adding 'square' (cross) 32-, 128-QAM types
- adding 'optimal' 64-, 128-, and 256-QAM constellations
- improved speed of most schemes' modulate/demodulate
implementations
- adding soft-decision (log-likelihood ratio) demodulation
- adding GMSK modulation/demodulation with improved filter design
* multicarrier
- ofdmframe: improving synchronization and reliability in
interference environments, enabling squelch, improving
equalization
* optim
- simplified interface to gradient search