US 11,716,236 B2
Systems and methods for OFDM performance enhancement on frequency selective fading channels
Richard Dean, Marriottsville, MD (US); and Tasmeer Alam, Baltimore, MD (US)
Assigned to Morgan State University, Baltimore, MD (US)
Filed by Morgan State University, Baltimore, MD (US)
Filed on Nov. 15, 2021, as Appl. No. 17/454,847.
Claims priority of provisional application 63/113,432, filed on Nov. 13, 2020.
Prior Publication US 2022/0158884 A1, May 19, 2022
Int. Cl. H04L 27/26 (2006.01)
CPC H04L 27/2646 (2013.01) 16 Claims
OG exemplary drawing
 
7. A system for optimizing OFDM telemetry communications, comprising:
a transmitter having a transmitter OFDM signal processor storing computer instructions thereon configured to generate an OFDM signal from a digital information signal using a current signal modulation scheme; and
a receiver having a receiver OFDM signal processor in communication with said transmitter through a radio channel, said receiver OFDM signal processor storing computer instructions thereon configured to:
determine at the receiver OFDM signal processor an optimum modulation scheme to apply to further transmissions from said transmitter based upon a real-time determination of signal distortion in said OFDM signal received at the receiver; and
transmit an indication of said optimum modulation scheme from said receiver to said transmitter through a feedback channel; and
said transmitter OFDM signal processor storing further computer instructions thereon configured to adjust said current signal modulation scheme to said optimum modulation scheme at said transmitter OFDM signal processor;
wherein each of said current modulation scheme and said optimum modulation scheme further comprise quadrature amplitude modulation (QAM) schemes; and
wherein said computer instructions configured to determine at the receiver OFDM signal processor an optimum modulation scheme is further configured to determine a signal-to-distortion ratio (SDR) profile for each tone for each frame of said OFDM signal received at the receiver, and process each said SDR profile per tone to estimate said optimum QAM modulation scheme for each tone.