Pilot symbol generation for highly-spectrally-efficient communications
A transmitter may be operable to generate a sequence of symbols which may comprise information symbols and one or more pilot symbols. The transmitter may transmit the information symbols at a first power and transmit the one or more pilot symbols at a second power. In instances when a particular performance indicator is below a determined threshold, the first power may be set to a first value and the second power may be set to zero value. In instances when the particular performance indicator is above the determined threshold, the first power may be set to a second value and the second power may be set to a non-zero value. A value of the first power and a value of the second power may be based on an applicable average power limit determined by a communications standard with which the transmitter is to comply.
1. A method, comprising:
in a transceiver:
generating a sequence comprising one or more pilot symbols and one or more information symbols;
transmitting said sequence using a first transmit power setting for said one or more pilot symbols and a second transmit power setting for said one or more information symbols, such that an average power of said transmitted sequence complies with a particular spectral mask;
determining phase noise and additive white Gaussian noise present in a received version of said transmitted sequence; and
in response to said determined phase noise and additive white Gaussian noise, concurrently adjusting said first transmit power setting and said second transmit power setting to achieve a desired balance between phase noise tolerance and additive white Gaussian noise tolerance.
2. The method of claim 1 , wherein said concurrently adjusting said first transmit power setting and said second transmit power setting comprises increasing said first transmit power setting and decreasing said second transmit power setting when said determined phase noise is above a determined threshold.
3. The method of claim 1 , wherein said concurrently adjusting said first transmit power setting and said second transmit power setting comprises decreasing said first transmit power setting and increasing said second transmit power setting when said determined phase noise is below a determined threshold.
4. The method of claim 1 , wherein said concurrently adjusting said first transmit power setting and said second transmit power setting comprises increasing said first transmit power setting and decreasing said second transmit power setting when said determined additive white Gaussian noise is below a determined threshold.
5. The method of claim 1 , wherein said concurrently adjusting said first transmit power setting and said second transmit power setting comprises decreasing said first transmit power setting and increasing said second transmit power setting when said determined additive white Gaussian noise is above a determined threshold.
6. The method of claim 1 , wherein said determining said phase noise and additive white Gaussian noise present in said received version of said transmitted sequence comprises receiving one or more measurements from a receiver that received said transmitted sequence.
7. The method of claim 1 , wherein generating said sequence comprises inserting said one or more pilot symbols at pseudorandom intervals among said one or more information symbols.
8. The method of claim 1 , wherein said sequence comprises K consecutive pilot symbols every N information symbols, where K and N are each a positive integer greater than one.
9. The method of claim 1 , comprising:
during said generating said sequence, determining how many of said one or more pilot symbols to insert in said sequence based on one or more performance indicators from a receiver to which said sequence is to be transmitted.
10. The method of claim 9 , wherein said one or more performance indicators comprise a signal-to-noise ratio.
11. A system, comprising:
a transceiver comprising:
circuitry operable to generate a sequence comprising one or more pilot symbols and one or more information symbols;
circuitry operable to transmit said sequence using a first transmit power setting for said one or more pilot symbols and a second transmit power setting for said one or more information symbols such that an average power of said transmitted sequence complies with a particular spectral mask;
circuitry operable to determine phase noise and additive white Gaussian noise present in a received version of said transmitted sequence; and
circuitry operable to, in response to said determined phase noise and additive white Gaussian noise, concurrently adjust said first transmit power setting and said second transmit power setting to achieve a desired balance between phase noise tolerance and additive white Gaussian noise tolerance.
12. The system of claim 11 wherein said concurrent adjustment of said first transmit power setting and said second transmit power setting comprises an increase of said first transmit power setting and a decrease of said second transmit power setting when said determined phase noise is above a determined threshold.
13. The system of claim 11 , wherein said concurrent adjustment of said first transmit power setting and said second transmit power setting comprises a decrease of said first transmit power setting and an increase of said second transmit power setting when said determined phase noise is below a predetermined threshold.
14. The system of claim 11 , wherein said concurrent adjustment of said first transmit power setting and said second transmit power setting comprises an increase of said first transmit power setting and a decrease of said second transmit power setting when said determined additive white Gaussian noise is below a predetermined threshold.
15. The system of claim 11 , wherein said concurrent adjustment of said first transmit power setting and said second transmit power setting comprises a decrease of said first transmit power setting and an increase of said second transmit power setting when said determined additive white Gaussian noise is above a determined threshold.
16. The system of claim 11 wherein said determination of said phase noise and additive white Gaussian noise present in said received version of said transmitted sequence comprises a reception of one or more measurements from a receiver that received said transmitted sequence.
17. The system of claim 11 , wherein said generation of said sequence comprises insertion of said one or more pilot symbols at pseudorandom intervals among said one or more information symbols.
18. The system of claim 11 , wherein said sequence comprises K consecutive pilot symbols every N information symbols, where K and N are each a positive integer greater than one.
19. The system of claim 11 , wherein:
said generation of said sequence comprises a determination of how many of said one or more pilot symbols to insert in said sequence based on one or more performance indicators from a receiver to which said sequence is to be transmitted.
20. A device, comprising:
circuitry configured to
generate a sequence comprising one or more pilot symbols and one or more information symbols;
transmit said sequence using a first transmit power setting for said one or more pilot symbols and a second transmit power setting for said one or more information symbols such that an average power of said transmitted sequence complies with a particular spectral mask;
determine phase noise and additive white Gaussian noise present in a received version of said transmitted sequence; and
in response to said determined phase noise and additive white Gaussian noise, concurrently adjust said first transmit power setting and said second transmit power setting to achieve a desired balance between phase noise tolerance and additive white Gaussian noise tolerance.