I'm trying to compute the the interference that one OFDM user with beamforming causes to another user. The two systems are fully overlapped in frequency and time. I know how to generate an OFDM signal in MATLAB and compute its BER in AWGN and fading channels, I just don't know how to implement beamforming. The beamform is a circular sinc, I believe I need multiply my signal with the gain of the main lobe of the sinc function. I don't know how to calculate the interference caused on the other user. I'm not asking for anyone to provide me with a code, I'm just hoping that someone here can provide some directions on how to approach this or if there are any other resources that I can check.
The interference you cause to the other user is determined by:
- The total transmit power of your transmitter
- The gain of your beampattern in the direction of the other user
- The path loss to the other user
- If the other user uses receive beamforming, then also by the gain of its beampattern in the direction of the transmitter
So if you transmit with a power of 10dBm, have a gain in the users direction of -20dB and a pathloss of 60dB, the other user receives -70dBm of interference power from the transmitter. Whether or not this is bad then depends also on how powerful the useful signal of the other user is.
More information is required here for a more detailled answer.