US 11,876,653 B2
Low-latency channel equalization using a secondary channel
Kevin J. Babich, Valparaiso, IN (US); Terry Lee Vishloff, Anmore (CA); and Danie J. van Wyk, Pretoria (ZA)
Assigned to Skywave Networks LLC, Chicago, IL (US)
Filed by Skywave Networks LLC, Chicago, IL (US)
Filed on May 6, 2022, as Appl. No. 17/662,294.
Application 17/662,294 is a continuation of application No. 15/929,163, filed on Nov. 14, 2019, granted, now 11,343,126.
Claims priority of provisional application 62/767,216, filed on Nov. 14, 2018.
Prior Publication US 2023/0085690 A1, Mar. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 4/00 (2018.01); H04L 27/01 (2006.01); G06Q 40/04 (2012.01); H04L 1/00 (2006.01); H04W 88/14 (2009.01)
CPC H04L 27/01 (2013.01) [G06Q 40/04 (2013.01); H04L 1/0003 (2013.01); H04W 88/14 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving a signal over a primary communication channel, wherein the primary communication channel includes a high frequency radio channel;
receiving at least a representative copy of the signal over a backend communication channel, wherein the backend communication channel has a greater latency and bandwidth than the primary communication channel;
determining a timing performance for the primary communication channel, wherein the timing performance includes a minimum time delay;
determining the minimum time delay at least based on financial trading timing data for a financial market;
determining a maximum delay time advantage limit, wherein the maximum delay time advantage limit is where being faster minimally impacts a rate of return in the financial market;
equalizing the primary communication channel with a first equalizer by comparing the signal with the representative copy, wherein the equalizing includes selecting a modulating and coding (MODCOD) scheme where an equalizer processing time for the equalizer is within the minimum time delay and the maximum delay time advantage limit;
establishing a best case performance of the first equalizer by delaying the signal by a delay during the equalizing;
converging a second equalizer with the first equalizer, wherein the converging occurs in response to the second equalizer at least satisfying the timing performance;
converging tap values of the first equalizer and the second equalizer;
combining the tap values of the first equalizer and the second equalizer to create a metric, wherein the metric includes an estimated inter-symbol interference (ISI) and signal to noise ratio (SNR);
selecting a modulation and coding method based on the metric; and
wherein the modulating and coding scheme is selected based on the estimated ISI and SNR.