63 lines
1.7 KiB
Fortran
63 lines
1.7 KiB
Fortran
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program code426
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parameter (MZ=26) !Number of 4-FSK symbols
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parameter (JZMAX=64) !Desired number of codewords
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integer ic(MZ,JZMAX),icsave(MZ)
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real c(MZ)
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character*12 arg
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nargs=iargc()
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if(nargs.ne.2) then
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print*,'Usage: code426 <nmsgs> <iters>'
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print*,'Example: code426 64 10000000'
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go to 999
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endif
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call getarg(1,arg)
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read(arg,*) nmsgs
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call getarg(2,arg)
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read(arg,*) iters
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call init_random_seed()
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open(13,file='code426.out',status='unknown')
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write(*,1002) nmsgs,iters
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write(13,1002) nmsgs,iters
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1002 format('Nmsgs:',i4,' Iters:',i10/(66('-')))
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do i=1,MZ !Create 4 mutually orthogonal codewords
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ic(i,1)=mod(i-1,4)
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ic(i,2)=mod(i,4)
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ic(i,3)=mod(i+1,4)
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ic(i,4)=mod(i+2,4)
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enddo
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do j=1,4 !Write them out
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write(*,1000) j,MZ,ic(1:MZ,j)
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write(13,1000) j,MZ,ic(1:MZ,j)
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1000 format(2i5,3x,26i2)
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enddo
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do j=5,nmsgs !Find codewords up to j=nmsgs with maximum
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npk=0 !distance from all the rest
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do i=1,iters
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call random_number(c) !Generate a random codeword candidate
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ic(1:MZ,j)=int(4*c) !Convert real to integer
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! nd=MZ
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! do k=1,j-1 !Test candidate against all others in list
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! n=count(ic(1:MZ,j).ne.ic(1:MZ,k))
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! nd=min(n,nd)
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! enddo
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call dist426(ic,j,mind)
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if(mind.gt.npk) then
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npk=mind
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icsave=ic(1:MZ,j) !Best candidate so far, save it
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! if(npk.ge.19) exit !It won't get any better...
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endif
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enddo
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write(*,1000) j,npk,ic(1:MZ,j)
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write(13,1000) j,npk,ic(1:MZ,j)
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enddo
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999 end program code426
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