bits2syms.m File Reference

Functions
if	mod (nbits, sym_bits) ~=0error("Length of bit stream has to be divisible by sym_bits")
1/sqrt(2	modvec_bpsk ()
mod_fcn_16qam, data	arrayfun ()
otherwise	fprintf ('Invalid MOD_ORDER(%d)! Must be in[2, 4, 16, 64]\n', MOD_ORDER)
end Plot constellation if do_plot	figure (1) ln_clr
	line ([-1.5, 1.5], [0 0], 'LineStyle', '-', 'Color', ln_clr, 'LineWidth', 1)
else	plot (syms(:), 0,' *', 'MarkerSize', 16, 'LineWidth', 2)
	axis (1.5 *[-1 1 -1 1])
	xlabel ('Inphase')
	ylabel ('Quadrature')
	title ('Constellation')

Variables
Author(s)	nbits = length(bitstream)
Do	yourselves
end bits to integer numbers	bit_mat = reshape(bitstream, sym_bits, [])'
	data = bi2de(bit_mat, 'left-msb')
	modvec_16qam = (1/sqrt(10)) .* [-3 -1 +3 +1]
	modvec_64qam = (1/sqrt(42)) .* [-7 -5 -1 -3 +7 +5 +1 +3]
	mod_fcn_bpsk = @(x) complex(modvec_bpsk(1+x),0)
	mod_fcn_qpsk = @(x) complex(modvec_bpsk(1+bitshift(x, -1)), modvec_bpsk(1+mod(x, 2)))
	mod_fcn_16qam = @(x) complex(modvec_16qam(1+bitshift(x, -2)), modvec_16qam(1+mod(x,4)))
	mod_fcn_64qam = @(x) complex(modvec_64qam(1+bitshift(x, -3)), modvec_64qam(1+mod(x,8)))
Map the data values on to complex symbols switch MOD_ORDER case BPSK	syms = arrayfun(mod_fcn_bpsk, data)
	return
grid	on
if	MOD_ORDER
end axis	square
hold	off

Function Documentation

arrayfun()

mod_fcn_16qam, data arrayfun ( )

virtual

axis()

axis

(

1.5 *

[-1 1 -1 1]

)

figure()

end Plot constellation if do_plot figure

(

1

)

fprintf()

otherwise fprintf	(	'Invalid MOD_ORDER(%d)! Must be in\n'	[2, 4, 16, 64],
		MOD_ORDER
	)

line()

line	(	'LineStyle'	,
		'-'	,
		'Color'	,
		ln_clr	,
		'LineWidth'	,
		1
	)

mod()

if mod ( nbits  , sym_bits    )

pure virtual

modvec_bpsk()

1/sqrt(2 modvec_bpsk ( )

virtual

plot()

else plot	(	syms(:)	,
		0	,
		' *'	,
		'MarkerSize'	,
		16	,
		'LineWidth'	,
		2
	)

title()

title

(

'Constellation'

)

xlabel()

xlabel

(

'Inphase'

)

ylabel()

ylabel

(

'Quadrature'

)

Variable Documentation

bit_mat

end bits to integer numbers bit_mat = reshape(bitstream, sym_bits, [])'

data

data = bi2de(bit_mat, 'left-msb')

mod_fcn_16qam

mod_fcn_16qam = @(x) complex(modvec_16qam(1+bitshift(x, -2)), modvec_16qam(1+mod(x,4)))

mod_fcn_64qam

mod_fcn_64qam = @(x) complex(modvec_64qam(1+bitshift(x, -3)), modvec_64qam(1+mod(x,8)))

mod_fcn_bpsk

mod_fcn_bpsk = @(x) complex(modvec_bpsk(1+x),0)

mod_fcn_qpsk

mod_fcn_qpsk = @(x) complex(modvec_bpsk(1+bitshift(x, -1)), modvec_bpsk(1+mod(x, 2)))

MOD_ORDER

if MOD_ORDER

Initial value:

= 2
        plot(syms(:),'*','MarkerSize',16, 'LineWidth',2)

modvec_16qam

modvec_16qam = (1/sqrt(10)) .* [-3 -1 +3 +1]

modvec_64qam

modvec_64qam = (1/sqrt(42)) .* [-7 -5 -1 -3 +7 +5 +1 +3]

nbits

Author (s) nbits = length(bitstream)

off

hold off

on

hold on

return

return

square

end axis square

syms

case QPSK syms = arrayfun(mod_fcn_bpsk, data)

yourselves

Do yourselves