sorry a correction,
> To convert this complex signal to a real, one has to do > this according to the following formula, isn't it? > > x(t) = Yc(t)Cos(2*pi*fc*t) - Yi(t)Sin(2*pi*fc*t) where > Yc(t) -> Inphase component,Yi(t)-> Quadrature component, fc -> Carrier > frequency, x(t) -> real signal. > > I looked at the block "complex_to_real" and it outputs the Inphase component > as the real signal. Is it because, "fc" is 0Hz as the signal being at > baseband? I think this sounds right. > > > I want to mulitply this real signal with a PN sequence and then pass the > result > on to a costas loop which takes a complex input. I want to know how can we > get a complex signal from a real one. Is there a block that does that? > > The book "Communication Systems" by Simon Haykin 2nd edition says, > - The complex envelope g_complex(t) equals a frequency shifted version of the > pre-envelope g+(t) as shown > g_complex(t) = g+(t)*exp(-j2*pi*fc*t), where fc-> carrier > frequency. > > and the pre-envelop is defined as, g+(t) = g_real(t) + j*g_hilbert(t). > > I suppose this is what I need to do to get what I want. Is there a block that > does it all? > > Thanks, > Peng. > > P.S. - I am sorry but I thought to make sure before I go ahead so that I > don't spend time doing things that may be unnecessary. > > >
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