Re: Direct Sequence Spread spectrum modulation
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Reg, Thanks.?? I won¡¯t even pretend to say that I understand how to do this but it¡¯s something I¡¯d like to dive into someday. -Craig ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Reginald Beardsley via groups.io
Sent: Tuesday, November 03, 2020 2:35 PM
To: [email protected]
Subject: Re: [qex] Direct Sequence Spread spectrum modulation? Craig,
Yes, that's the idea. The crosscorrelation is an FFT and multiply by the PRNs of the selected senders. This makes it very computationally cheap to monitor several senders in a net and ignore everyone outside the net. After you've done the FFT once for each frame it's just a vector multiply and add.
Reg
On Tuesday, November 3, 2020, 02:03:25 PM CST, Craig Johnson, AA0ZZ <aa0zz@...> wrote:
Reg,
Fascinating! I've wanted to play with this for many years also.
Quick question that I've never understood about PRN's. Does everyone (ham community) use the same formula for generating PRNs such that if a station's call is used as a seed then both stations would have the same sequences for encoding and decoding?
73,
-Craig, AA0ZZ
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