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[Discuss-gnuradio] Re: Simultaneously transmitting on two transmitters

From: Wee Shinhan
Subject: [Discuss-gnuradio] Re: Simultaneously transmitting on two transmitters
Date: Thu, 6 Mar 2008 23:26:53 -0800 (PST)

Hi Jiqun,

Thanks for your reply, i greatly appreciate the help,
I would try your suggestion, another idea is what if i
used 2 USRP? is the idea feasible? Thanks again for
the help.

--- jiqun qi <address@hidden> wrote:
> >
> In principle, in USRP, if these two transmit
> daughter boards share "one
> common clock", it could not achieve the
> "strict-sense simultaneously
> transmitting" because your program is executed in
> "sequence", not
> "parallel". However, you can "first" transmit the
> symbol s1 on antenna 1,
> "then" transmit s2 on antenna 2 "almost
> simultaneously" from the view point
> of well programming.
> For example,  you can send symbols s1 and s2 to the
> transmit buffer first,
> then enable the two antennas for transmitting, so
> the transmit time cycle
> difference \delta_t will be smaller than the way
> that you send symbol s1 to
> the antenna 1, and enable it for transmitting, then
> do the symbol s2,
> because there is the time cycle consumption that you
> send symbol s2 to the
> transmit buffer.
> I am not sure how actually it would be in practice.
> And I will try my best
> to do it in the following days.

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