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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] sending single tone Am modulated using usrp1+wbx |
Date: | Mon, 07 Jan 2013 19:57:28 -0500 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
Consider the attached AM transmitter simulation that uses a complex signal source for both the modulation source (1kHz tone), and the carrier (0Hz). Note that the signal spectrum is exactly as you would expect, and I and Q are *both* non-zero in the "scope" sink. Keep in mind that the representation of signals we talk about here is given by: x(t) = x1 (t) cos(ω0 t) − x2 (t) sin(ω0 t) And that direct-conversion SDR hardware (such as the USRP) uses the I/Q representation of the signals, in which both the in-phase and quadrature components are significant. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
complex_am_xmit.grc
Description: application/gnuradio-grc
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