David,Really clever. So, the effect of an error is that you potentially lose bits rather than the whole frame, and you stay synched for the next frame.
The downside, I guess, is that in the case of narrowband noise, you lose the /same /bits from one frame to the next. But you could 1. Send two frames per symbol, and only one per pair would be subject to the noise. 2. Alternate the bit distribution pattern, but then you'd have to sync to that.
Thanks
Bruce
On 02/16/2012 04:39 PM, David Rowe wrote:
Peter Martinez suggested making the frame period the same as the PSK symbol period. For example the 1500 bit/s mode would have 60 carriers at 25 bit/s (40 ms symbol period). The advantage of this mode is no frame sync overhead is reqd.
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