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From: | George Nychis |
Subject: | Re: [Discuss-gnuradio] in-band signaling & dependent packets (i.e., ACK generation) |
Date: | Sat, 12 Jan 2008 13:01:56 -0500 |
User-agent: | Thunderbird 2.0.0.6 (X11/20071022) |
Thanks Brian,
A matched filter is just a FIR filter that does correlation because the coefficients are a specific sequence instead of a frequency response. This is how CDMA works. You "spread" your one bit out over this PN sequence and then use a matched filter to correlate against the expected PN sequence. You can either get a 1 or a -1 depending if you sent a 0 or a 1.
Would any of the FIR filters that already exist in GR be appropriate? I could then perform the cross-correlation on the output of the block.
- George
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