NameDateSize

..10-Aug-201812 KiB

Android.bp10-Aug-2018517

ccsds.h10-Aug-2018105

char.h10-Aug-2018538

CleanSpec.mk10-Aug-20182.4 KiB

config.guess10-Aug-201843.5 KiB

config.h.in10-Aug-2018522

config.sub10-Aug-201826.9 KiB

configure10-Aug-2018126.6 KiB

configure.in10-Aug-20181.9 KiB

cpu_features.s10-Aug-2018184

cpu_mode_ppc.c10-Aug-2018955

cpu_mode_x86.c10-Aug-2018853

decode_rs.c10-Aug-20186.7 KiB

decode_rs.h10-Aug-20188.2 KiB

decode_rs_8.c10-Aug-2018442

decode_rs_ccsds.c10-Aug-2018691

decode_rs_char.c10-Aug-2018453

decode_rs_int.c10-Aug-2018425

dotprod.c10-Aug-20181.8 KiB

dotprod.h10-Aug-2018448

dotprod_av.c10-Aug-20182.5 KiB

dotprod_mmx.c10-Aug-20182.3 KiB

dotprod_mmx_assist.s10-Aug-20181.7 KiB

dotprod_port.c10-Aug-20181.2 KiB

dotprod_sse2.c10-Aug-20181.9 KiB

dotprod_sse2_assist.s10-Aug-20181.6 KiB

dsp.310-Aug-20182.3 KiB

dtest.c10-Aug-20182 KiB

encode_rs.c10-Aug-20181.2 KiB

encode_rs.h10-Aug-20182.3 KiB

encode_rs_8.c10-Aug-20183 KiB

encode_rs_av.c10-Aug-20182 KiB

encode_rs_ccsds.c10-Aug-2018676

encode_rs_char.c10-Aug-2018325

encode_rs_int.c10-Aug-2018323

exercise.c10-Aug-20182.9 KiB

fec.c10-Aug-20181.3 KiB

fec.h10-Aug-201812.9 KiB

fixed.h10-Aug-2018785

gen_ccsds.c10-Aug-2018869

gen_ccsds_tal.c10-Aug-20181.5 KiB

init_rs.c10-Aug-2018896

init_rs.h10-Aug-20182.6 KiB

init_rs_char.c10-Aug-2018848

init_rs_int.c10-Aug-2018845

INSTALL10-Aug-2018950

install-sh10-Aug-20185.5 KiB

int.h10-Aug-2018534

lesser.txt10-Aug-201825.8 KiB

makefile.in10-Aug-20185.3 KiB

mmxbfly27.s10-Aug-20183.4 KiB

mmxbfly29.s10-Aug-20183.7 KiB

MODULE_LICENSE_LGPL10-Aug-20180

NOTICE10-Aug-201825.8 KiB

peak_mmx_assist.s10-Aug-20181.2 KiB

peak_sse2_assist.s10-Aug-2018995

peak_sse_assist.s10-Aug-2018925

peaktest.c10-Aug-2018797

peakval.c10-Aug-2018750

peakval_av.c10-Aug-20181.7 KiB

peakval_mmx.c10-Aug-2018533

peakval_mmx_assist.s10-Aug-20181.3 KiB

peakval_port.c10-Aug-2018274

peakval_sse.c10-Aug-2018540

peakval_sse2.c10-Aug-2018544

peakval_sse2_assist.s10-Aug-20181 KiB

peakval_sse_assist.s10-Aug-2018953

README10-Aug-20184.6 KiB

rs-common.h10-Aug-2018935

rs.310-Aug-20187.6 KiB

rs_speedtest.c10-Aug-20181.5 KiB

rstest.c10-Aug-20187.3 KiB

sim.c10-Aug-20181,016

simd-viterbi.310-Aug-201810.3 KiB

sqtest.c10-Aug-2018883

sse2bfly27.s10-Aug-20185.5 KiB

sse2bfly29.s10-Aug-20185.8 KiB

ssebfly27.s10-Aug-20184.7 KiB

ssebfly29.s10-Aug-20186.5 KiB

sumsq.c10-Aug-2018841

sumsq_av.c10-Aug-20182.4 KiB

sumsq_mmx.c10-Aug-2018849

sumsq_mmx_assist.s10-Aug-20181.7 KiB

sumsq_port.c10-Aug-2018371

sumsq_sse2.c10-Aug-2018810

sumsq_sse2_assist.s10-Aug-20181.2 KiB

sumsq_test.c10-Aug-20182 KiB

viterbi27.c10-Aug-20183.4 KiB

viterbi27_av.c10-Aug-20186.7 KiB

viterbi27_mmx.c10-Aug-20182.9 KiB

viterbi27_port.c10-Aug-20184.6 KiB

viterbi27_sse.c10-Aug-20182.9 KiB

viterbi27_sse2.c10-Aug-20185.4 KiB

viterbi29.c10-Aug-20183.3 KiB

viterbi29_av.c10-Aug-20185.7 KiB

viterbi29_mmx.c10-Aug-20182.9 KiB

viterbi29_port.c10-Aug-20184.1 KiB

viterbi29_sse.c10-Aug-20183 KiB

viterbi29_sse2.c10-Aug-20183.1 KiB

viterbi39.c10-Aug-20183.3 KiB

viterbi39_av.c10-Aug-20188.7 KiB

viterbi39_mmx.c10-Aug-20185.5 KiB

viterbi39_port.c10-Aug-20184.3 KiB

viterbi39_sse.c10-Aug-20186 KiB

viterbi39_sse2.c10-Aug-20186.3 KiB

viterbi615.c10-Aug-20183.4 KiB

viterbi615_av.c10-Aug-20188.9 KiB

viterbi615_mmx.c10-Aug-20185.5 KiB

viterbi615_port.c10-Aug-20184.3 KiB

viterbi615_sse.c10-Aug-20186.2 KiB

viterbi615_sse2.c10-Aug-20186.6 KiB

vtest27.c10-Aug-20184.7 KiB

vtest29.c10-Aug-20184.7 KiB

vtest39.c10-Aug-20184.8 KiB

vtest615.c10-Aug-20185 KiB

README

1COPYRIGHT
2
3This package is copyright 2006 by Phil Karn, KA9Q. It may be used
4under the terms of the GNU Lesser General Public License (LGPL). See
5the file "lesser.txt" in this package for license details.
6
7INTRODUCTION
8
9This package provides a set of functions that implement several
10popular forward error correction (FEC) algorithms and several low-level routines
11useful in modems implemented with digital signal processing (DSP).
12
13The following routines are provided:
14
151. Viterbi decoders for the following convolutional codes:
16
17r=1/2 k=7 ("Voyager" code, now a widely used industry standard)
18r=1/2 k=9 (Used on the IS-95 CDMA forward link)
19r=1/6 k=15 ("Cassini" code, used by several NASA/JPL deep space missions)
20
212. Reed-Solomon encoders and decoders for any user-specified code.
22
233. Optimized encoder and decoder for the CCSDS-standard (255,223)
24Reed-Solomon code, with and without the CCSDS-standard "dual basis"
25symbol representation.
26
274. Compute dot product between a 16-bit buffer and a set of 16-bit
28coefficients. This is the basic DSP primitive for digital filtering
29and correlation.
30
314. Compute sum of squares of a buffer of 16-bit signed integers. This is
32useful in DSP for finding the total energy in a signal.
33
345. Find peak value in a buffer of 16-bit signed integers, useful for
35scaling a signal to prevent overflow.
36
37SIMD SUPPORT
38
39This package automatically makes use of various SIMD (Single
40Instruction stream, Multiple Data stream) instruction sets, when
41available: MMX, SSE and SSE2 on the IA-32 (Intel) architecture, and
42Altivec on the PowerPC G4 and G5 used by Power Macintoshes.
43
44"Altivec" is a Motorola trademark; Apple calls it "Velocity Engine",
45and IBM calls it "VMX". Altivec is roughly comparable to SSE2 on the
46IA-32.
47
48Many of the SIMD versions run more than an order of
49magnitude faster than their portable C versions. The available SIMD
50instruction sets, if any, are determined at run time and the proper
51version of each routine is automatically selected. If no SIMD
52instructions are available, the portable C version is invoked by
53default. On targets other than IA-32 and PPC, only the portable C
54version is built.
55
56The SIMD-assisted versions generally produce the same results as the C
57versions, with a few minor exceptions. The Viterbi decoders in C have
58a very slightly greater Eb/No performance due to their use of 32-bit
59path metrics. On the other hand, the SIMD versions use the
60"saturating" arithmetic available in these instructions to avoid the
61integer wraparounds that can occur in C when argument ranges are not
62properly constrained. This applies primarily to the "dotprod" (dot
63product) function.
64
65The MMX (MultiMedia eXtensions) instruction set was introduced on
66later Pentium CPUs; it is also implemented on the Pentium II and most
67AMD CPUs starting with the K6. SSE (SIMD Streaming Extensions) was
68introduced in the Pentium III; AMD calls it "3D Now! Professional".
69Intel introduced SSE2 on the Pentium 4, and it has been picked up by
70later AMD CPUs. SSE support implies MMX support, while SSE2 support
71implies both SSE and MMX support.
72
73The latest IA-32 SIMD instruction set, SSE3 (also known as "Prescott
74New Instructions") was introduced in early 2004 with the latest
75("Prescott") revision of the Pentium 4. Relatively little was
76introduced with SSE3, and this library currently makes no use of it.
77
78See the various manual pages for details on how to use the library
79routines.
80
81Copyright 2006, Phil Karn, KA9Q
82karn@ka9q.net
83http://www.ka9q.net/
84
85This software may be used under the terms of the GNU Lesser General
86Public License (LGPL); see the file lesser.txt for details.
87
88Revision history:
89Version 1.0 released 29 May 2001
90
91Version 2.0 released 3 Dec 2001:
92Restructured to add support for shared libraries.
93
94Version 2.0.1 released 8 Dec 2001:
95Includes autoconf/configure script
96
97Version 2.0.2 released 4 Feb 2002:
98Add SIMD version override options
99Test for lack of SSE2 mnemonic support in 'as'
100Build only selected version
101
102Version 2.0.3 released 6 Feb 2002:
103Fix to parityb function in parity.h
104
105feclib version 1.0 released November 2003
106Merged SIMD-Viterbi, RS and DSP libraries
107Changed SIMD Viterbi decoder to detect SSE2/SSE/MMX at runtime rather than build time
108
109feclib version 2.0 (unreleased) Mar 2004
110General speedups and cleanups
111Switch from 4 to 8-bit input symbols on all Viterbi decoders
112Support for Altivec on PowerPC
113Support for k=15 r=1/6 Cassini/Mars Pathfinder/Mars Exploration Rover/STEREO code
114Changed license to GNU Lesser General Public License (LGPL)
115
116feclib version 2.1 June 5 2006
117Added error checking, fixed alignment bug in SSE2 versions of Viterbi decoders causing segfaults
118
119feclib version 2.1.1 June 6 2006
120Fix test/benchmark time measurement on Linux
121