US 11,777,639 B2 · How to maximize phase-noise margins in 5G and 6G

Abstract

Enhanced phase-noise mitigation is possible at low-to-no cost. Communication at the high frequencies envisioned for late 5G and 6G will require much better phase-noise control than current frequency bands, because the tight margins will result in excessive phase faults and greatly reduced throughput. The disclosed examples show how to use two modulation schemes to provide the best phase margins at the final step. For example, the message can be initially modulated in classical amplitude-phase modulation as transmitted, but is received and processed using convenient QAM orthogonal components. Then the receiver can convert the results back to the amplitude-phase modulation scheme analytically, and can finally demodulate using calibrated amplitude and phase levels derived from a proximate demodulation reference. Since the amplitude-phase modulation scheme provides substantially larger phase margins than QAM with the same information content, substantially higher frequencies can be accessed while retaining high reliability.

Claims18

Dependent claims

A method for a wireless receiver to demodulate a message, the method comprising:

a. using a first modulation scheme comprising two multiplexed modulation parameters and integer Nstate allowed modulation states, each allowed modulation state comprising a predetermined combination of the two multiplexed modulation parameters;
b. determining one or more acceptance regions comprising combinations of the two multiplexed modulation parameters, wherein each acceptance region contains exactly one of the allowed modulation states;
c. receiving a message comprising message elements, each message element comprising a raw signal;
d. demodulating each message element according to the first modulation scheme;
e. determining whether the message element, as demodulated, is within one of the acceptance regions;
f. when the message element, as demodulated, is within a particular acceptance region, assigning the message element to the allowed modulation state contained in the particular acceptance region;
and
g. when the message element, as demodulated, is not within any of the acceptance regions, determining that the message element is faulted.

5 more elements

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

a. receiving a wireless message comprising message elements, each message element modulated according to a first modulation scheme, the first modulation scheme comprising a first plurality of modulation states, wherein each modulation state of the first plurality comprises a first modulation parameter multiplexed with a second modulation parameter;
b. for each message element, demodulating the message element according to a second modulation scheme comprising a second plurality of modulation states, wherein each modulation state of the second plurality comprises a third modulation parameter multiplexed with a fourth modulation parameter, wherein the third and fourth modulation parameters differ from the first and second modulation parameters;
c. for each message element, converting the third and the fourth modulation parameters into the first and second modulation parameters, according to an algorithm;
and then
d. demodulating each message element by determining which modulation state of the first plurality comprises modulation parameters that are closest to the first and second modulation parameters of the message element.

2 more elements

Dependencies are inferred from the claim text.

How to maximize phase-noise margins in 5G and 6G

Life of this patent

How to maximize phase-noise margins in 5G and 6G

Life of this patent

Abstract

Claims18