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https://github.com/saitohirga/WSJT-X.git
synced 2025-10-30 20:40:28 -04:00
Add routines necessary to generate simulated 'wspr4' wav files.
This commit is contained in:
Steven Franke
parent
e82b9ffa38
commit
c5e2593979
@ -610,6 +610,9 @@ set (wsjt_FSRCS
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lib/fsk4hf/encode174_74.f90
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lib/fsk4hf/bpdecode174_74.f90
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lib/fsk4hf/osd174_74.f90
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lib/fsk4hf/wspr4sim.f90
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lib/fsk4hf/genwspr4.f90
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lib/fsk4hf/gen_wspr4wave.f90
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)
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# temporary workaround for a gfortran v7.3 ICE on Fedora 27 64-bit
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@ -1357,6 +1360,9 @@ target_link_libraries (ldpcsim174_91 wsjt_fort wsjt_cxx)
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add_executable (ldpcsim174_74 lib/fsk4hf/ldpcsim174_74.f90 wsjtx.rc)
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target_link_libraries (ldpcsim174_74 wsjt_fort wsjt_cxx)
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add_executable (wspr4sim lib/fsk4hf/wspr4sim.f90 wsjtx.rc)
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target_link_libraries (wspr4sim wsjt_fort wsjt_cxx)
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endif(WSJT_BUILD_UTILS)
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# build the main application
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68
lib/fsk4hf/gen_wspr4wave.f90
Normal file
68
lib/fsk4hf/gen_wspr4wave.f90
Normal file
@ -0,0 +1,68 @@
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subroutine gen_wspr4wave(itone,nsym,nsps,fsample,f0,cwave,wave,icmplx,nwave)
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real wave(nwave)
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complex cwave(nwave)
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real, allocatable, save :: pulse(:)
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real, allocatable :: dphi(:)
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integer itone(nsym)
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logical first
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data first/.true./
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save pulse,first,twopi,dt,hmod
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if(first) then
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allocate( pulse(3*nsps*fsample) )
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twopi=8.0*atan(1.0)
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dt=1.0/fsample
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hmod=1.0
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! Compute the smoothed frequency-deviation pulse
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do i=1,3*nsps
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tt=(i-1.5*nsps)/real(nsps)
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pulse(i)=gfsk_pulse(1.0,tt)
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enddo
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first=.false.
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endif
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! Compute the smoothed frequency waveform.
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! Length = (nsym+2)*nsps samples, zero-padded
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allocate( dphi(0:(nsym+2)*nsps-1) )
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dphi_peak=twopi*hmod/real(nsps)
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dphi=0.0
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do j=1,nsym
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ib=(j-1)*nsps
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ie=ib+3*nsps-1
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dphi(ib:ie) = dphi(ib:ie) + dphi_peak*pulse(1:3*nsps)*itone(j)
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enddo
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! Calculate and insert the audio waveform
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phi=0.0
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dphi = dphi + twopi*f0*dt !Shift frequency up by f0
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wave=0.
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if(icmplx.eq.1) cwave=0.
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k=0
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do j=0,(nsym+2)*nsps-1
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k=k+1
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if(icmplx.eq.0) then
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wave(k)=sin(phi)
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else
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cwave(k)=cmplx(cos(phi),sin(phi))
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endif
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phi=mod(phi+dphi(j),twopi)
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enddo
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! Compute the ramp-up and ramp-down symbols
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if(icmplx.eq.0) then
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wave(1:nsps)=wave(1:nsps) * &
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(1.0-cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
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k1=(nsym+1)*nsps+1
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wave(k1:k1+nsps-1)=wave(k1:k1+nsps-1) * &
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(1.0+cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
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else
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cwave(1:nsps)=cwave(1:nsps) * &
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(1.0-cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
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k1=(nsym+1)*nsps+1
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cwave(k1:k1+nsps-1)=cwave(k1:k1+nsps-1) * &
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(1.0+cos(twopi*(/(i,i=0,nsps-1)/)/(2.0*nsps)))/2.0
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endif
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return
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end subroutine gen_wspr4wave
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97
lib/fsk4hf/genwspr4.f90
Normal file
97
lib/fsk4hf/genwspr4.f90
Normal file
@ -0,0 +1,97 @@
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subroutine genwspr4(msg0,ichk,msgsent,msgbits,i4tone)
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! Encode an FT4 message
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! Input:
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! - msg0 requested message to be transmitted
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! - ichk if ichk=1, return only msgsent
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! - msgsent message as it will be decoded
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! - i4tone array of audio tone values, {0,1,2,3}
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! Frame structure:
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! s16 + 87symbols + 2 ramp up/down = 105 total channel symbols
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! r1 + s4 + d29 + s4 + d29 + s4 + d29 + s4 + r1
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! Message duration: TxT = 105*13312/12000 = 116.48 s
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! use iso_c_binding, only: c_loc,c_size_t
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use packjt77
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include 'wspr4_params.f90'
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character*37 msg0
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character*37 message !Message to be generated
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character*37 msgsent !Message as it will be received
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character*77 c77
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character*24 c24
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integer*4 i4tone(NN),itmp(ND)
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integer*1 codeword(2*ND)
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integer*1 msgbits(74),rvec(77)
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integer icos4a(4),icos4b(4),icos4c(4),icos4d(4)
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integer*4 ncrc24
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logical unpk77_success
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data icos4a/0,1,3,2/
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data icos4b/1,0,2,3/
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data icos4c/2,3,1,0/
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data icos4d/3,2,0,1/
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data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
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1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
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0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
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message=msg0
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do i=1, 37
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if(ichar(message(i:i)).eq.0) then
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message(i:37)=' '
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exit
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endif
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enddo
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do i=1,37 !Strip leading blanks
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if(message(1:1).ne.' ') exit
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message=message(i+1:)
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enddo
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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
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msgbits=0
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read(c77,'(50i1)') msgbits(1:50)
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call get_crc24(msgbits,ncrc24)
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write(c24,'(b24.24)') ncrc24
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read(c24,'(24i1)') msgbits(51:74)
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if(ichk.eq.1) go to 999
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read(c77,'(74i1)',err=1) msgbits
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if(unpk77_success) go to 2
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1 msgbits=0
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itone=0
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msgsent='*** bad message *** '
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go to 999
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entry get_wspr4_tones_from_74bits(msgbits,i4tone)
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2 msgbits=mod(msgbits+rvec(1:74),2)
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call encode174_74(msgbits,codeword)
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! Grayscale mapping:
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! bits tone
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! 00 0
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! 01 1
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! 11 2
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! 10 3
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do i=1,ND
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is=codeword(2*i)+2*codeword(2*i-1)
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if(is.le.1) itmp(i)=is
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if(is.eq.2) itmp(i)=3
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if(is.eq.3) itmp(i)=2
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enddo
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i4tone(1:4)=icos4a
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i4tone(5:33)=itmp(1:29)
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i4tone(34:37)=icos4b
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i4tone(38:66)=itmp(30:58)
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i4tone(67:70)=icos4c
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i4tone(71:99)=itmp(59:87)
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i4tone(100:103)=icos4d
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999 return
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end subroutine genwspr4
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16
lib/fsk4hf/wspr4_params.f90
Normal file
16
lib/fsk4hf/wspr4_params.f90
Normal file
@ -0,0 +1,16 @@
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! WSPR4
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! LDPC(174,74)/CRC24 code, four 4x4 Costas arrays for sync, ramp-up and ramp-down symbols
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parameter (KK=50) !Information bits (50 + CRC24)
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parameter (ND=87) !Data symbols
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parameter (NS=16) !Sync symbols
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parameter (NN=NS+ND) !Sync and data symbols (103)
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parameter (NN2=NS+ND+2) !Total channel symbols (105)
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parameter (NSPS=13312) !Samples per symbol at 12000 S/s
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parameter (NZ=NSPS*NN) !Sync and Data samples (1,397,136)
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parameter (NZ2=NSPS*NN2) !Total samples in shaped waveform (1,397,760)
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parameter (NMAX=408*3456) !Samples in iwave (1,410,048)
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parameter (NFFT1=4*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
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parameter (NSTEP=NSPS) !Coarse time-sync step size
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parameter (NHSYM=(NMAX-NFFT1)/NSTEP) !Number of symbol spectra (1/4-sym steps)
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parameter (NDOWN=32) !Downsample factor
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115
lib/fsk4hf/wspr4sim.f90
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115
lib/fsk4hf/wspr4sim.f90
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@ -0,0 +1,115 @@
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program wspr4sim
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! Generate simulated signals for experimental "wspr4" mode
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use wavhdr
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use packjt77
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include 'wspr4_params.f90' !Set various constants
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type(hdr) h !Header for .wav file
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character arg*12,fname*17
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character msg37*37,msgsent37*37
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character c77*77
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complex c0(0:NMAX-1)
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complex c(0:NMAX-1)
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real wave(NMAX)
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integer itone(NN)
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integer*1 msgbits(74)
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integer*2 iwave(NMAX) !Generated full-length waveform
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.7) then
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print*,'Usage: wspr4sim "message" f0 DT fdop del nfiles snr'
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print*,'Examples: wspr4sim "K9AN EN50 37" 1500 0.0 0.1 1.0 10 -15'
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go to 999
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endif
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call getarg(1,msg37) !Message to be transmitted
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call getarg(2,arg)
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read(arg,*) f0 !Frequency (only used for single-signal)
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call getarg(3,arg)
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read(arg,*) xdt !Time offset from nominal (s)
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call getarg(4,arg)
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read(arg,*) fspread !Watterson frequency spread (Hz)
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call getarg(5,arg)
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read(arg,*) delay !Watterson delay (ms)
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call getarg(6,arg)
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read(arg,*) nfiles !Number of files
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call getarg(7,arg)
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read(arg,*) snrdb !SNR_2500
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nfiles=abs(nfiles)
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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hmod=1.0 !Modulation index (0.5 is MSK, 1.0 is FSK)
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tt=NSPS*dt !Duration of symbols (s)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ2*dt !Transmission length (s)
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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call genwspr4(msg37,0,msgsent37,msgbits,itone)
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write(*,*)
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write(*,'(a9,a37,3x,a7,i1,a1,i1)') 'Message: ',msgsent37,'i3.n3: ',i3,'.',n3
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write(*,1000) f0,xdt,txt,snrdb
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1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1)
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write(*,*)
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if(i3.eq.1) then
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write(*,*) ' mycall hiscall hisgrid'
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write(*,'(28i1,1x,i1,1x,28i1,1x,i1,1x,i1,1x,15i1,1x,3i1)') msgbits(1:77)
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else
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write(*,'(a14)') 'Message bits: '
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write(*,'(77i1)') msgbits
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endif
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write(*,*)
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write(*,'(a17)') 'Channel symbols: '
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write(*,'(76i1)') itone
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write(*,*)
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call sgran()
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fsample=12000.0
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icmplx=1
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call gen_wspr4wave(itone,NN,NSPS,fsample,f0,c0,wave,icmplx,NMAX)
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k=nint((xdt+0.5)/dt)-NSPS
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c0=cshift(c0,-k)
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if(k.gt.0) c0(0:k-1)=0.0
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if(k.lt.0) c0(NMAX+k:NMAX-1)=0.0
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do ifile=1,nfiles
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c=c0
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if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NMAX,NZ,fs,delay,fspread)
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c=sig*c
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wave=real(c)
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peak=maxval(abs(wave))
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nslots=1
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if(snrdb.lt.90) then
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do i=1,NMAX !Add gaussian noise at specified SNR
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xnoise=gran()
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wave(i)=wave(i) + xnoise
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enddo
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endif
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gain=100.0
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if(snrdb.lt.90.0) then
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wave=gain*wave
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else
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datpk=maxval(abs(wave))
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fac=32766.9/datpk
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wave=fac*wave
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endif
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if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
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iwave=nint(wave)
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h=default_header(12000,NMAX)
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write(fname,1102) ifile
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1102 format('000000_',i6.6,'.wav')
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open(10,file=fname,status='unknown',access='stream')
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write(10) h,iwave !Save to *.wav file
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close(10)
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write(*,1110) ifile,xdt,f0,snrdb,fname
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1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
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enddo
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999 end program wspr4sim
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