about spectrum sensing and bandpass filter
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Hi there, i am doing simulation for energy detector and i am having strange problems (as it looks to me..). whenever i modulate my 5Khz carrier signal with my BPSK data....i transmit it to the channel awgn ....and when i receive it at the receiver i apply bandpass filter that results into zero detection as the energy of signal is below the threshold.so i get Probability of detection equal to zero. whereas without Bandpass filter i get my signal detected with some probability of detection. Why is that so? and also can one share the threshold calculation equation....gaminv or chi2inv....
Thanks
Talha
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Walter Roberson
2011년 8월 22일
What are your bandpass filter settings? Pass between what and what, and roll off how quickly?
How are you doing the modulation? If you are inserting more than one bit per cycle of the carrier, then the data you are passing would be at much higher frequency than the carrier signal (especially if you are using triangular or square wave modulation as those call for infinite frequencies.)
I only have a very small amount of experience with filtering, but it seems to me that you do not want bandpass: that instead you want to filter out the 5 KHz and lower, leaving only the higher frequency data that you had modulated the carrier with.
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