Source code

C code

1. Error correcting codes and information theory
   • AWGN capacity calculation functions (unconstrained input and binary input)
     capacity.c, capacity.h
   • crcccitt.c
   • Convolutional codes -- a complete simulation package, with ability to specify arbitrary nonrecursive convolutional code generator polynomials, decoding delay, Eb/No, number of bits to simulate, differential encoding, etc.
     viterbi.tar.gz
   • CCSDS turbo encoders
     encoder.c: a complete example which computes all tables
     encsimple.c: a simplified version for rate 1/4, with precomputed tables
     encfast.c: a faster version which doesn't use intermediate arrays. (This saves both memory and the time required for index computations)
     enctst.c: benchmarking program, to be used with encfast.c
     
2. Random number generation, noise
   • Phase noise generator for arbitrary PSD
     phase_noise.c, phase_noise.h
   • Random number generation* (binary, uniform, Gaussian, complex Gaussian)
     random.c, random.h
   • Random number generation with seed reset option*
     random_with_reset.c,
   • Random number generation (uniform, Gaussian, Laplacian, Gauss-Markov)
     rands.c,
   • Webb density (Webb pdf and deviate generation functions)
     webb.c, webb.h
3. Communications, signal_processing
   • Bandwidth calculations for unfiltered BPSK, QPSK, 8-PSK
     bandwidth.c, bandwidth.h
   • Communications related functions (phi, Phi, Q, entropy, inv_entropy, db, undb, gauss_pdf, modulo, phase_diff)
     comm.c, comm.h
   • Digital phase-locked loops (DPLL's), 1st-4th order
     dpll.c, dpll.h
   • Fast Fourier Transform (FFT) functions* (four1, realft, twofft, convlv)
     fft.c
   • Finite Impulse Response (FIR) filter functions, efficiently implemented using FFT's
     fir.c
   • Huygens Recovery Task Force (HRTF) programs (see also matlab section)
     dttl.c: Cassini-Huygens symbol synchronizer loop
     dttl.tar.gz: Simulation of Cassini-Huygens symbol synchronizer loop, including EPS plot generation
     dttl_decoder.tar.gz: Simulation of Cassini-Huygens symbol synchronizer loop on signal which includes Huygens frame synthesis, CCSDS Reed-Solomon encoding, differential encoding, and convolutional encoding
4. Math, numerical solutions
   • Bessel functions*
     bessel.c
   • Binomial functions* (factorial, log factorial, n choose k)
     binomial.c, binomial.h
   • Complex functions* (add, sub, mul, conjugate, div, abs, abs_sq, real time complex, rect2polar, polar2rect, pow, e^z)
     dcomplex.c, dcomplex.h
   • Confidence intervals (assuming binomial, Poisson, or Gaussian distribution)
     confidence_intervals.c, confidence_intervals.h
   • Interpolate between pairs of numbers
     interpolate.c
   • Cholesky decomposition*
     linear_algebra.c
   • Histogram creation
     histogram.c, histogram.h
   • Minimization by Brent's method*
     int_minimize.c
   • Integration*
     integrate.c, integrate.h, integrate2.c
   • Statistics (mean, variance estimates from sample set)
     statistics.c, statistics.h
5. Utilities (File manipulation, I/O, benchmarks)
   • ASCII-binary conversion programs
     ascii2binary.c, binary2ascii.c
   • Definitions for colored terminal output
     color.h,
   • File handling functions
     file_utils.c, file_utils.h
   • Size of unsigned int, int, long unsigned, float, double, char
     sizeof.c
   • Locate index of value in sorted array*
     sort.c
   • Dynamic memory allocation of 1 and 2 dimensional arrays*
     nrutil.c, nrutil.h

Octave code (Matlab compatible)

• getwavs.m
• Huygens Recovery Task Force (HRTF) programs (see also C section)
  dttl.m: Digital Transition Tracking Loop (DTTL)
  bw_est.m: Evaluation of bit sync. loop bandwidth
  interp.m: Upsample a signal

Mathematica code