# US 10,374,851 B2 · Communication system, communication device and communication method that can improve frequency use efficiency > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,851 B2 - Document ID: US10374851B2 - Status: Granted - Kind: B2 - Application number: 15/617,742 - Filed: 2017-06-08 - Published: 2017-09-21 - Granted: 2019-08-06 - Earliest claimed: 2008-03-05 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Shimpei To; Minoru Kubota; Yasuhiro Hamaguchi; Hideo Namba; Kazunari Yokomakura - Web page: https://patentgrep.com/patent/US10374851B2 ## CPC - H04L 27/156: with demodulation using temporal properties of the received signal, e.g. detecting pulse width - H04J 11/004: {using regenerative subtractive interference cancellation} - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0023: {Time-frequency-space} - 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 25/0226: {sounding signals per se} - H04L 25/03159: {operating in the frequency domain (H04L25/03165, H04L25/03178 take precedence)} - H04L 2025/03426: {transmission using multiple-input and multiple-output channels} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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) ## Abstract A communication device receives a reception signal including at least a first reception signal and a second reception signal, where the first reception signal is a signal to be transmitted using a first set of subcarriers and the second reception signal is a signal to be transmitted using a second set of subcarriers which overlaps with at least one end of the first set of subcarriers in a time frame. The communication device also demodulates information indicating data included in the first reception signal after reducing the second reception signal transmitted by using one or more overlapping subcarriers of the second set of subcarriers from the reception signal. ## Claims ### Claim 1 A communication device comprising: reception circuitry configured to and/or programmed to receive a reception signal including at least a first reception signal and a second reception signal, and demodulation circuitry configured to and/or programmed to demodulate information included in the first reception signal, wherein the first reception signal is a signal received on a first set of subcarriers and the second reception signal is a signal received on a second set of subcarriers a part of which overlaps with at least one end of the first set of subcarriers in a time frame, and the reception signal includes a third reception signal on a third set of subcarriers a part of which overlaps with at least the other end of the first set of subcarriers in the time frame, and the third set of subcarriers does not overlap with the second set of subcarriers. ### Claim 2 (depends on 1) The communication device according to claim 1, wherein the reception circuitry is configured to and/or programmed to receive the first reception signal from a first communication device and the second reception signal from a second communication device. ### Claim 3 (depends on 1) The communication device according to claim 1, wherein a number of reception antennas to receive the reception signal is less than a number of signals which are compositions of the reception signal. ### Claim 4 (depends on 1) The communication device according to claim 1, wherein the demodulation circuitry is configured to and/or programmed to demodulate the information included in the first reception signal using a iterative process. ### Claim 5 (depends on 1) The communication device according to claim 1, wherein the number of subcarriers which is overlapping between the first set of subcarriers and the second set of subcarriers is set in each of the time frames. ### Claim 6 (depends on 1) The communication device according to claim 1, wherein the first reception signal has reception power which is different from reception power of the second reception signal. ### Claim 7 (depends on 1) The communication device according to claim 1, wherein the demodulation circuitry configured to and/or programmed to demodulate information included in the first reception signal after reducing the part of the second reception signal received on the part of the second set of subcarriers which is overlapping with at least one end of the first set of subcarriers from the reception signal. ### Claim 8 (depends on 1) The communication device according to claim 1, wherein the demodulation circuitry configured to and/or programmed to demodulate information included in the first reception signal after reducing the part of the second reception signal received on the part of the second set of subcarriers which is overlapping with at least one end of the first set of subcarriers from the reception signal and reducing the part of the third reception signal received on the part of the third set of subcarriers which is overlapping with at least the other end of the first set of subcarriers from the reception signal.