US 11,637,649 B2 · Phase-noise mitigation at high frequencies in 5G and 6G

Abstract

As 5G, and especially 6G, push into ever-higher frequencies, phase noise presents an increasing problem. Disclosed are procedures and modulation schemes to mitigate phase noise and permit messaging at higher frequencies. Each modulation scheme provides phase-noise immunity by configuring modulation states with large phase acceptance regions. A message element is faulted if its sum-signal amplitude or phase is in an exclusion zone. Modulation schemes with fewer phase levels, more amplitude levels, and very broad phase acceptance regions are necessary for high frequency operation where phase noise dominates. Using allowed states with the maximum amplitude modulation in both branches can provide nearly 90-degree phase acceptance. Requiring that the two branches be equal provides nearly 180-degree phase acceptance. Further requiring that the amplitude levels be positive can provide total phase-noise immunity, with a 360-degree allowable phase range. Embodiments can thereby enable high frequency communication despite phase noise.

Claims19

Dependent claims

A method for a wireless transmitter to transmit a message comprising message elements, the method comprising:

using a modulation scheme comprising two or more predetermined amplitude levels and a plurality of allowed modulation states, wherein:
i) each allowed modulation state comprises an I-branch signal multiplexed with an orthogonal Q-branch signal;
ii) wherein each I-branch signal comprises an I-branch amplitude, and each Q-branch signal comprises a Q-branch amplitude;
iii) wherein each I-branch amplitude is modulated according to one of the predetermined amplitude levels, and each Q-branch amplitude is modulated according to one of the predetermined amplitude levels;
iv) wherein, for every allowed modulation state of the modulation scheme, the I-branch amplitude and the Q-branch amplitude of the allowed modulation state are equal in magnitude;
modulating each message element of the message according to the allowed modulation states of the modulation scheme;
and
transmitting the message, wherein:
a) the modulation scheme comprises a maximum amplitude level;
b) the modulation scheme comprises exactly four allowed modulation states;
and
c) for each of the allowed modulation states, a magnitude of the I-branch amplitude equals the maximum amplitude level, and a magnitude of the Q-branch amplitude equals the maximum amplitude level.

9 more elements

A wireless receiver configured to:

a) using a modulation scheme comprising integer Nstate allowed states, each allowed state comprising an I-branch having an I-branch amplitude, multiplexed with an orthogonal Q-branch having a Q-branch amplitude, wherein for each allowed state, a magnitude of the I-branch amplitude equals a magnitude of the Q-branch amplitude;
b) using, for each allowed state, an associated phase acceptance region comprising a range of I-branch amplitudes and a range of Q-branch amplitudes;
c) receive a message comprising message elements, each message element comprising a received I-branch amplitude and a received Q-branch amplitude;
d) determine, according to the received I-branch amplitude and the received Q-branch amplitude, whether the message element is modulated in one of the phase acceptance regions, and if so, demodulating the message element according to the associated allowed state;
and
e) if the message element is not modulated in any of the phase acceptance regions, determining that the message element is faulted.

3 more elements

Non-transitory computer-readable media in a wireless entity, the media containing instructions that when implemented in a computing environment cause a method to be performed, the method comprising:

a) using a modulation scheme comprising two or more predetermined amplitude levels and a plurality of allowed modulation states;
i) wherein each allowed modulation state comprises an I-branch multiplexed with an orthogonal Q-branch;
ii) wherein for each allowed modulation state, the I-branch and the Q-branch are both amplitude modulated according to the same amplitude level, of the predetermined amplitude levels;
b) modulating each message element of a message according to the modulation scheme and transmitting the message;
c) then receiving a received message modulated according to the modulation scheme;
d) for each received message element of the received message, calculating a sum-signal according to the amplitudes of the I-branch and the Q-branch of the received message element, wherein the sum-signal comprises a sum-signal amplitude and a sum-signal phase;
and
e) selecting a particular allowed modulation state according to the sum-signal amplitude and the sum-signal phase.

5 more elements

Dependencies are inferred from the claim text.

Phase-noise mitigation at high frequencies in 5G and 6G

Life of this patent

Phase-noise mitigation at high frequencies in 5G and 6G

Life of this patent

Abstract

Claims19