Hi Greg
RRR
One thing to consider- accurate PAPR measurement (by a receiver) is
hard at low SNR.
Tone reservation is probably the lowest cost means for this setup. And
backward compatible.
Remapping as I described this morning is probabaly reasonable, also-
--given that LDPC encode is approximately a LUT and the FFT (DFT?) is
very short.
On 22/06/2020 2:17 pm, Greg Maxwell wrote:
On Sun, Jun 21, 2020 at 9:51 PM glen english <[email protected]> wrote:
I was giving some thought to how PAPR reduction might be implemented
within the current framework, taking into account the limited capability
of the SM1000 processor.
One thing to perhaps consider is the ease at which a sufficiently
advanced receiver can use the PAPR correction to enhance its own
signal: The receiver knows that what the sender sent was PAPR reduced,
and so it should be able to use this to enhance its demodulation.
Constant envelope single carrier signals you can pretty much directly
derive an equalizer from recovering the constant envelope using the
constant modulus algorithm.
There are many papers on using forward error correction schemes to
reduce PAPR, with the idea being that you choose a scheme and
constellation mapping whos valid codewords have lower PAPR. Then
simply applying error correction exploits the sender's signal
constraint.
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