Patent ID: 11863359
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A first device comprising:
first radio frequency (RF) circuitry; and
first baseband circuitry coupled to the first RF circuitry, wherein the first baseband circuitry:
generates first quadrature amplitude modulation (QAM) symbols;
performs an inverse fast Fourier transform (IFFT) of the first QAM symbols to generate first data using a digital multi-carrier modulation scheme that defines a set of data subcarriers in a wireless channel, wherein a first data subcarrier and a second data subcarrier of the set of data subcarriers operate at a first amplitude value;
sends the first data, via the first RF circuitry, to a second device;
receives, from the second device, second data comprising a first value indicative of a first received signal power level corresponding to the first data subcarrier and a second value indicative of a second received signal power level corresponding to the second data subcarrier;
determines, using the first value, a second amplitude value for at least the first data subcarrier based on the first value; and
performs an IFFT of second QAM symbols to generate third data, wherein the second amplitude value is determined before the IFFT of the second QAM symbols corresponding to the third data.