PHASE COMPENSATION FOR MULTICARRIER SIGNALING

1 .- 28 . (canceled)

29 . A method for phase compensation in multicarrier communication, comprising:

identifying, from a plurality of component carriers, a first component carrier having a first boundary and a second component carrier having a second boundary;

obtaining a gain state phase at the first boundary of the first component carrier; and

performing a phase compensation for the second component carrier based on the gain state phase of the first component carrier.

30 . The method of claim 29 , wherein the gain state phase of the first component carrier is obtained from a lookup table.

31 . The method of claim 30 , wherein the phase compensation is performed using a digital complex rotator by obtaining the gain state phase from the lookup table.

32 . The method of claim 29 , performing the phase compensation for the second component carrier comprises de-rotating an OFDM symbol of the second component carrier corresponding to the first boundary of the first component carrier by multiplying the OFDM symbol by a compensation term

g

c

=

e

j

⁢

ωτ

(

1

+

g

tr

)

⁢

e

j

⁢

ϕ

tr

,

where τ denotes an RF delay from a pre-transient signal to a post-transient pre-compensation signal of the second component carrier, g tr denotes a gain transient value, and Ø tr denotes a phase transient value.

33 . The method of claim 32 , wherein the pre-transient signal is expressed as S(t), a post-transient signal is expressed as S(t)(1+g tr )e jØ tr , and the post-transient pre-compensation signal is expressed as S(t)(1+g tr )e jØ tr e −jωτ .

34 . The method of claim 32 , wherein the phase transient value is determined by a method comprising:

generating a baseband signal including a first in-phase signal and a first quadrature phase signal;

loading the baseband signal into a vector signal generator to up-convert the baseband signal to an RF signal and modulate the RF signal;

providing the RF signal to a device-under-test (DUT), the DUT including a low-noise amplifier (LNA) connected to a gain controller;

providing an output signal from the LNA to a vector signal analyzer to demodulate and down-convert the RF signal into a second in-phase signal and a second quadrature phase signal; and

processing the second in-phase signal and the second quadrature phase signal output from the vector signal analyzer.

35 . The method of claim 34 , wherein processing the second in-phase signal and the second quadrature phase signal comprises:

collecting an RF envelope based on a trigger signal received from the gain controller;

de-rotating the second in-phase signal and the second quadrature phase signal;

transforming Cartesian to complex; and

obtaining the phase transient value and a phase transient duration.

36 . The method of claim 35 , wherein the trigger signal is generated at a time when a gain state of the LNA is changed.

37 . A mobile device for wireless communication, comprising:

at least one antenna;

a processor; and

a memory storing instructions, when executed by the processor, cause the mobile device to:

receive a signal comprising a first component carrier and a second component carrier, the first component carrier including a first boundary and the second component carrier including a second boundary;

obtain a gain state phase at the first boundary of the first component carrier; and

perform a phase compensation for the second component carrier based on the gain state phase of the first component carrier.

38 . The mobile device of claim 37 , wherein the gain state phase of the first component carrier is obtained from a lookup table stored in the mobile device.

39 . The mobile device of claim 38 , further comprising a digital complex rotator configured to perform the phase compensation using the gain state phase of the first component carrier obtained from the lookup table.

40 . The mobile device of claim 37 , performing the phase compensation for the second component carrier comprises de-rotating an OFDM symbol of the second component carrier corresponding to the first boundary of the first component carrier by multiplying the OFDM symbol by a compensation term

g

c

=

e

j

⁢

ωτ

(

1

+

g

tr

)

⁢

e

j

⁢

ϕ

tr

,

where τ denotes an RF delay from a pre-transient signal to a post-transient pre-compensation signal of the second component carrier, g tr denotes a gain transient value, and Ø tr denotes a phase transient value.

41 . The mobile device of claim 40 , wherein the pre-transient signal is expressed as S(t), a post-transient signal is expressed as S(t)(1+g tr )e jØ tr , and the post-transient pre-compensation signal is expressed as S(t)(1+g tr )e jØ tr e −jωτ .

42 . The mobile device of claim 37 , wherein the mobile device is configured to be connected to a first base station and a second base station at the same time and the first component carrier and the second component carrier are two downlink component carriers transmitted to the mobile device.

43 . The mobile device of claim 42 , wherein the first base station is an eNB and the second base station is a gNB, the eNB and the gNB being non-collocated.

44 . The mobile device of claim 43 , wherein the mobile device further includes at least four antennas configured to communicate with the eNB and the gNB using 4×4 multiple-input and multiple-output (MIMO) communication, and the phase compensation is performed for each signal path connected to each of the four antennas.

45 . The mobile device of claim 37 , wherein a same automatic gain controller (AGC) is used for processing the first component carrier and the second component carrier.

46 . The mobile device of claim 41 , wherein the phase transient value is determined by a method comprising:

generating a baseband signal including a first in-phase signal and a first quadrature phase signal;

loading the baseband signal into a vector signal generator to up-convert the baseband signal to an RF signal and modulate the RF signal;

providing the RF signal to a device-under-test (DUT), the DUT including a low-noise amplifier (LNA) connected to a gain controller;

providing an output signal from the LNA to a vector signal analyzer to demodulate and down-convert the RF signal into a second in-phase signal and a second quadrature phase signal; and

processing the second in-phase signal and the second quadrature phase signal output from the vector signal analyzer.

47 . The mobile device of claim 46 , wherein processing the second in-phase signal and the second quadrature phase signal comprises:

collecting an RF envelope based on a trigger signal received from the gain controller;

de-rotating the second in-phase signal and the second quadrature phase signal;

transforming Cartesian to complex; and

obtaining a phase transient value and a phase transient duration.

48 . The mobile device of claim 47 , wherein the trigger signal is generated at a time when a gain state of the LNA is changed.

49 . A non-transitory computer readable medium storing instructions that, when executed by a processor, perform a method comprising:

identifying, from a plurality of component carriers, a first component carrier having a first boundary and a second component carrier having a second boundary;

obtaining a gain state phase at the first boundary of the first component carrier; and

performing a phase compensation for the second component carrier based on the gain state phase of the first component carrier.