Method and apparatus of algorithm for coherent receivers with m-qam modulation format
AssigneeZTE (USA) Inc.
InventorJianjun Yu
Life of this patent
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Abstract
An improved Eighth-Order Statistics (EOS) blind phase recovery method is proposed for high-order coherent modulation formats. The method combining EOS blind phase estimate with maximum-likelihood (ML) carrier phase estimate uses multi-stage feed-forward carrier phase recovery algorithm. Experimental results show that the proposed new algorithm can reduce the required computational effort by more than a factor of 3 for 16-QAM system.
Claims12
A method for carrier phase recovery of a carrier wave, the method comprising:
- receiving at least one digital signal;
- generating a first phase angle of a first estimate of the at least one digital signal using eighth-order statistics;
- and
- generating a second phase angle of a second estimate of the at least one digital signal, wherein the second phase angle is based at least in part on the first estimate.
An article of manufacture including a computer-readable medium having instructions stored thereon, comprising:
- instructions for receiving at least one digital signal;
- instructions for generating a first phase angle of a first estimate of the at least one digital signal using eighth-order statistics;
- and
- instructions for generating a second phase angle of a second estimate of the at least one digital signal, wherein the second phase angle is based at least in part on the first estimate.
An apparatus for carrier phase recovery of a carrier wave, the method comprising:
- means for receiving at least one digital signal;
- means for generating a first phase angle of a first estimate of the at least one digital signal using eighth-order statistics;
- and
- means for generating a second phase angle of a second estimate of the at least one digital signal, wherein the second phase angle is based at least in part on the first estimate.
Dependencies are inferred from the claim text.