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

Claim 8:
9. A first device comprising:
a baseband processor comprising:
Orthogonal Frequency Division Multiplexing (OFDM) circuitry, wherein the OFDM circuitry uses a digital multi-carrier modulation scheme that defines a set of data subcarriers, a set of pilot subcarriers, and a direct current (DC) subcarrier; and
subcarrier pre-equalization digital signal processing (DSP) logic;

a modulator coupled to the baseband processor; and
a power amplifier coupled to the modulator, wherein the subcarrier pre-equalization DSP logic is configured to:
receive, from a second device, first data indicative of a frequency selective fading characteristic of a wireless channel between the first device and the second device; and
change a first amplitude value of a subset of the set of data subcarriers to a second amplitude value, which removes the frequency selective fading characteristic of the wireless channel, wherein the OFDM circuitry is configured to:
generate a modulation symbol using input bits of second data;
convert the modulation symbol into discrete time-domain data, wherein the first amplitude value is adjusted to the second amplitude value before a conversion of the modulation symbol; and
convert the discrete time-domain data into analog data, wherein the modulator is to modulate the analog data onto RF signals, and the power amplifier is to amplify and send the RF signals.