Hi, I am going to do a research project which needs to cancel feedback data signal of an amplifier. The data signal frequency is 10MHz which is not audio type. I have searched the internet that most of the feedback algorithm are for audio signal, which allows a little distortion in the output signal. However, as the input data type is not audio, the output data must not be distorted in any way. Could anyone introduce me a feedback signal cancellation algorithm which meets these criterions? The hardware used could be DSP or FPGA or both. Thanks!
Signal Feedback Cancellation
Started by ●August 22, 2005
Reply by ●August 27, 20052005-08-27
I have some idea, but not known whether the direction is OK. Could someone give me some idea? I need to make a matched filter of length n to match the input signal at a defined time, which is the time after sending out nth tap data. Because of high frequency and long path reflection, the feedback signal has a phase change, so I need also check the matching within one period of the signal. If I employ 40MHz sampling, I need to take into account 4 sampling points more (40/10). The matching amplitude is used as a attentuation factor of matching signal, which is used to substract the input signal to retrieve the real input signal.