Dear Mohammad, Is the 1 MHz carrier modulated? If yes, what is its bandwidth? Are the two signals correlated?
I'm pretty sure that *if* you go the LMS / adaptive route, then there will be no way around synchronization. I'm *not* sure that it's the optimal route to take! Best regards, Marcus On 20.08.2017 18:11, mohammad nejati wrote: > Hi , > It is difficult to explain what i need but i want to try it . > > I have a single modulated carrier with 5 Mhz bandwidth i send it throw > cable and receive delayed version of that with a good SNR like 45dB . > > I store i/q sample in last stage of transmitter , > In cable i add one 1 Mhz carrier with lower power into exactly 5 mhz > equipped bandwidth of carrier (1Mhz carrier is hidden in 5 Mhz carrier > due to lower signal power) . > what i want to do is in receiver subtract transited signal from > received signal in a proper delay and phase and recover 1 Mhz carrier > . > > I use LMS algorithm for adaption and subtraction and that work only > when received i/q sample have exactly same center frequency with > stored transmitted i/q sample which in reality with SDR board and zero > if architecture it is almost impossible . i don't want find center > frequency of received carrier with method like costas loop , because > modulated signal may have difference modulation like 64 QAM , 16 QAM , > 32APSK , BPSK ... i want find and lock received center frequency and > phase with help of that i stored a correct version of that before > transmit . > > i attached an image of subtracted signal and recovered smaller carrier > (which is in an ideal condition without frequency drift). > > Thank you , > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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