公开(公告)号：US12126483B2

公开(公告)日：2024-10-22

申请号：US17988332

申请日：2022-11-16

Applicant: Nokia Solutions and Networks Oy

Inventor： Giancarlo Gavioli ,  Luca Gabriele Razzetti ,  Carlo Costantini ,  Andreas Leven

IPC: H04L27/36 ,  H04B10/556 ,  H04L27/34

CPC classification number: H04L27/364 ,  H04B10/5561 ,  H04L27/3405 ,  H04L27/3433 ,  H04L27/366

Abstract: Architectures for inter-converting bitstreams and symbol streams of PAM and/or QAM constellations of different sizes that are not base-2 integers. Some of such constellations may be Gray-coded, and the constellation mapping may be performed to achieve an equiprobable distribution of different constellation symbols. Some embodiments may be compatible with FEC schemes. In an example embodiment, a transmitter DSP may employ a conventional constellation mapper preceded by an electronic encoder programmed to exclude some constellation-symbol labels from the bitstream applied to the mapper. In different embodiments, the electronic encoder may employ a CCDM and/or a long-division operation to select some amplitudes of the constellation and to exclude others. At least some embodiments are beneficially capable of achieving a smaller gap to the Shannon limit than comparable conventional solutions.