# US 2022/0046560 A1 · Method and apparatus for transmitting and receiving signal in frequency-asynchronous non-orthogonal multiple access system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0046560 A1 - Document ID: US20220046560A1 - Status: Published application - Kind: A1 - Application number: 17/390,146 - Filed: 2021-07-30 - Published: 2022-02-10 - Earliest claimed: 2020-08-06 - Assignees: Samsung Electronics Co., Ltd.; Industry-Academic Cooperation Foundation, Yonsei University - Applicants: Samsung Electronics Co., Ltd.; Industry-Academic Cooperation Foundation, Yonsei University - Inventors: Kwonjong LEE; Hakkeon LEE; Insik JUNG; Daesik HONG; Hyojin LEE - Web page: https://patentgrep.com/patent/US20220046560A1 ## CPC - H04W 56/001: {Synchronization between nodes} - H04J 11/0036: {at the receiver} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 25/0202: {Channel estimation} - H04L 25/0226: {sounding signals per se} - H04L 25/03343: {Arrangements at the transmitter end} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The disclosure relates to post-4th generation (4G) communication systems, such as 5th generation (5G) or 6th generation (6G), which support a higher data rate than the long term evolution (LTE) or 4G communication systems. A method and an apparatus for transmitting and receiving signals in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) communication system are provided. The method for transmitting a signal by a base station in an FA-NOMA system includes determining a frequency offset to be applied to a first signal transmitted to a first user equipment (UE) based on a second signal transmitted to a second UE, determining information for interference caused by the frequency offset, determining at least one pre-processing factor for the first UE based on the information for the interference, and transmitting a third signal including at least one first pilot to the first UE using the at least one pre-processing factor. The second signal includes at least one second pilot. ## Claims ### Claim 1 A method for transmitting a signal by a base station in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) system, the method comprising: determining a frequency offset to be applied to a first signal transmitted to a first user equipment (UE) based on a second signal transmitted to a second UE; determining information for interference caused by the frequency offset; determining at least one pre-processing factor for the first UE based on the information for the interference; and transmitting a third signal including at least one first pilot to the first UE using the at least one pre-processing factor, wherein the second signal includes at least one second pilot. ### Claim 2 (depends on 1) The method of claim 1, wherein the frequency offset is less than or equal to 0.5 times a preset subcarrier spacing. ### Claim 3 (depends on 1) The method of claim 1, wherein the information for the interference includes information for interference caused by the first signal to which the frequency offset is applied, with respect to the at least one second pilot included in the second signal. ### Claim 4 (depends on 1) The method of claim 1, wherein the at least one pre-processing factor is a factor determined to prevent interference to the at least one second pilot caused by the first signal to which the frequency offset is applied. ### Claim 5 (depends on 1) The method of claim 1, further comprising: broadcasting the at least one pre-processing factor through a control channel. ### Claim 6 (depends on 5) The method of claim 5, wherein the broadcasting of the at least one pre-processing factor through the control channel comprises broadcasting at least one of subcarrier index information for the at least one first pilot, information for the frequency offset, information for a total number of subcarriers, or information for elements of a matrix representing the at least one pre-processing factor. ### Claim 7 A method for receiving a signal by a first user equipment (UE) in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) system, the method comprising: receiving a signal including at least one pilot from a base station; estimating a channel based on the at least one pilot; demodulating a second signal transmitted to a second UE based on the received signal; obtaining a first signal transmitted to the first UE by removing the demodulated second signal from the received signal; generating a frequency offset compensated signal by performing frequency offset compensation on the first signal; generating a post-processed signal by performing post-processing on the frequency offset compensated signal using at least one post-processing factor; and obtaining a demodulated signal by demodulating the post-processed signal, wherein the at least one post-processing factor is determined based on at least one pre-processing factor received from the base station. ### Claim 8 (depends on 7) The method of claim 7, wherein the frequency offset used for the frequency offset compensation is less than or equal to 0.5 times a preset subcarrier spacing. ### Claim 9 (depends on 7) The method of claim 7, wherein the at least one post-processing factor is a Hermitian matrix of a matrix representing the at least one pre-processing factor. ### Claim 10 (depends on 7) The method of claim 7, wherein the at least one pre-processing factor is received from the base station through a control channel, and further comprising: receiving at least one of subcarrier index information for the at least one pilot, information for the frequency offset used for the frequency offset compensation, information for a total number of subcarriers, or information for elements of a matrix representing the at least one pre-processing factor, along with the at least one pre-processing factor. ### Claim 11 A base station in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) system, the base station comprising: a transceiver; and at least one processor configured to: determine a frequency offset to be applied to a first signal transmitted to a first user equipment (UE) based on a second signal transmitted to a second UE, determine information for interference caused by the frequency offset, determine at least one pre-processing factor for the first UE based on the information for the interference, and control the transceiver to transmit a third signal including at least one first pilot to the first UE using the at least one pre-processing factor, wherein the second signal includes at least one second pilot. ### Claim 12 (depends on 11) The base station of claim 11, wherein the frequency offset is less than or equal to 0.5 times a preset subcarrier spacing. ### Claim 13 (depends on 11) The base station of claim 11, wherein the information for the interference includes information for interference caused by the first signal to which the frequency offset is applied, with respect to the at least one second pilot included in the second signal. ### Claim 14 (depends on 11) The base station of claim 11, wherein the at least one pre-processing factor is a factor determined to prevent interference to the at least one second pilot caused by the first signal to which the frequency offset is applied. ### Claim 15 (depends on 11) The base station of claim 11, wherein the at least one processor is further configured to control the transceiver to broadcast the at least one pre-processing factor through a control channel. ### Claim 16 (depends on 15) The base station of claim 15, wherein the at least one processor is further configured to control the transceiver to broadcast at least one of subcarrier index information for the at least one first pilot, information for the frequency offset, information for a total number of subcarriers, or information for elements of a matrix representing the at least one pre-processing factor. ### Claim 17 A first user equipment (UE) in a frequency-asynchronous non-orthogonal multiple access (FA-NOMA) system, the first UE comprising: a transceiver; and at least one processor configured to: control the transceiver to receive a signal including at least one pilot from a base station, estimate a channel based on the at least one pilot, demodulate a second signal transmitted to a second UE based on the received signal, obtain a first signal transmitted to the first UE by removing the demodulated second signal from the received signal, generating a frequency offset compensated signal by performing frequency offset compensation on the first signal, generating a post-processed signal by performing post-processing on the frequency offset compensated signal using at least one post-processing factor, and obtain a demodulated signal by demodulating the post-processed signal, wherein the at least one post-processing factor is determined based on at least one pre-processing factor received from the base station. ### Claim 18 (depends on 17) The first UE of claim 17, wherein the frequency offset used for the frequency offset compensation is less than or equal to 0.5 times a preset subcarrier spacing. ### Claim 19 (depends on 17) The first UE of claim 17, wherein the at least one post-processing factor is a Hermitian matrix of a matrix representing the at least one pre-processing factor. ### Claim 20 (depends on 17) The first UE of claim 17, wherein the at least one pre-processing factor is received from the base station through a control channel, and wherein the at least one processor is further configured to control the transceiver to receive at least one of subcarrier index information for the at least one pilot, information for the frequency offset used for the frequency offset compensation, information for a total number of subcarriers, and information for elements of a matrix representing the at least one pre-processing factor, along with the at least one pre-processing factor.