Adaptive signal decompression
View Patent ↗The adverse effects of RF and baseband circuits are mitigated using a post-compensation method wherein a transfer function that would un-distort or complement a distorted waveform is parameterized to a relatively small number of degrees of freedom; and the parameters are estimated in a feedback loop. The error function of the feedback loop is generated by comparing some relatively low-order statistics that are known a priori or can be computed with relative certainty from the decided output waveform—to the statistics of the corrected signal.
1. An apparatus comprising:
an orthogonal frequency division multiplexing (OFDM) circuit configured to generate OFDM symbols of input data, wherein the OFDM circuit is further configured to generate a peak-to-average power ratio (PAR) of a signal carrying the OFDM symbols and to embed the PAR as information within the signal; and
a power amplifier configured to amplify the signal carrying the OFDM symbols.
2. The apparatus of claim 1 , wherein the OFDM circuit is further configured to generate the PAR of the signal for a predetermined number of OFDM symbols.
3. The apparatus of claim 1 , wherein the PAR is computed as an average.
4. The apparatus of claim 3 , further comprising embedding the average PAR as information in a header or a payload of a data packet.
5. The apparatus of claim 1 , wherein the PAR is computed as an average over n symbols, and wherein an indication of a value of n is also transmitted.
6. A method of providing information for decompressing a distorted signal, the method comprising:
generating orthogonal frequency division multiplexing (OFDM) symbols of input data;
generating a peak-to-average power ratio (PAR) of a signal carrying the OFDM symbols;
embedding the PAR as information within the signal; and
amplifying the signal carrying the OFDM symbols.
7. The method of claim 6 , wherein generating the PAR of the signal further comprises generating the PAR based on a predetermined number of OFDM symbols.
8. The method of claim 6 , wherein the PAR is generated as an average.
9. The method of claim 8 , further comprising embedding the average PAR as information in a header or a payload of a data packet.
10. The method of claim 6 , wherein the PAR is generated as an average over n symbols, and wherein an indication of a value of n is also transmitted.