US 12,170,569 B1
Adaptive modulation and coding schemes for enhanced spectral efficiency
Mu Xu, Broomfield, CO (US); Zhensheng Jia, Superior, CO (US); Junwen Zhang, Broomfield, CO (US); Haipeng Zhang, Broomfield, CO (US); and Luis Alberto Campos, Superior, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by Cable Television Laboratories, Inc., Louisville, CO (US)
Filed on Nov. 24, 2021, as Appl. No. 17/535,099.
Claims priority of provisional application 63/164,245, filed on Mar. 22, 2021.
Claims priority of provisional application 63/117,734, filed on Nov. 24, 2020.
Int. Cl. H04L 1/00 (2006.01); H04L 1/20 (2006.01); H04Q 11/00 (2006.01)
CPC H04L 1/0003 (2013.01) [H04L 1/004 (2013.01); H04L 1/20 (2013.01); H04Q 11/0067 (2013.01); H04Q 2011/0081 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for improving spectral efficiency of an optical telecommunication network based on use of a first modulation coding schemes (MCS) for communication with a first end device in operable communication with a hub of the optical communication network, the method comprising the steps of:
selecting the first MCS for a first telecommunication signal to be exchanged between the hub and the first end device over a first channel of the optical telecommunication network, wherein the first telecommunication signal includes a first bandwidth and a first dynamic range, wherein the first MCS includes a first modulation format having an integer order and configured to maximize the first dynamic range such that the first dynamic range does not exceed a signal parameter threshold of the first channel over the first bandwidth;
indexing the first telecommunication signal into a plurality of adjacent sub-signals, wherein each adjacent sub-signal of the plurality of adjacent sub-signals spans a second bandwidth less than and within the first bandwidth; and
dynamically adjusting a first adjacent sub-signal to achieve a second dynamic range (a) greater than the first dynamic range, and (b) that does not exceed the signal parameter threshold of the channel within a first frequency range of the second bandwidth of the first adjacent sub-signal,
wherein the step of dynamically adjusting the first adjacent sub-signal is based on sub-steps of (a) modifying the first modulation format by a non-integer fraction of the first modulation format, and (b) applying a different coding rate to the first adjacent sub-signal than is applied to at least one other adjacent sub-signal of the plurality of adjacent sub-signals.