# US 2016/0366004 A1 · Modulation method and apparatus for signal transmission and reception in mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0366004 A1 - Document ID: US20160366004A1 - Status: Published application - Kind: A1 - Application number: 15/120,928 - Filed: 2015-02-13 - Published: 2016-12-15 - Earliest claimed: 2014-02-27 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sungnam HONG; Min SAGONG; Chiwoo LIM - Web page: https://patentgrep.com/patent/US20160366004A1 ## CPC - H04L 27/3411: {reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set} - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04L 1/0006: {by adapting the transmission format} - H04L 1/0007: {by modifying the frame length} - H04L 1/0026: {Transmission of channel quality indication} - H04L 25/03866: {using scrambling} - H04L 27/106: {M-ary FSK} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract A method and a transmission device of a mobile communication system are disclosed. The method includes determining a modulation method for data transmission, determining the level of a quadrature amplitude modulation (QAM) according to the determined modulation method, determining the amplitude of a carrier wave and the phase of the carrier wave on the basis of the determined QAM level and the data to be transmitted, and, when the determined modulation method is a first modulation method, determining a sequence length, selecting a sequence form among sequences having the determined length according to the data to be transmitted, and generating a symbol modulating the data to be transmitted, on the basis of the selected sequence, the determined amplitude of the carrier wave, and the determined phase of the carrier wave. ## Claims ### Claim 1 A method of signal transmission for a transmitter device in a mobile communication system, the method comprising: identifying a modulation scheme for data transmission; identifying a level for quadrature amplitude modulation (QAM) based on the identified modulation scheme; identifying a amplitude and phase of a carrier wave based on the QAM level and data to be transmitted; and identifying, if the identified modulation scheme is a first scheme, a length of sequences, selecting a sequence according to the data to be transmitted among sequences of the identified length, and generating modulated symbol corresponding to the data to be transmitted based on the selected sequence, the amplitude of the carrier wave and the phase of the carrier wave. ### Claim 2 (depends on 1) The method of claim 1, further comprising modulating, if the identified modulation scheme is a second scheme, the data to be transmitted based on the amplitude of the carrier wave and phase of the carrier wave. ### Claim 3 (depends on 1) The method of claim 1, further comprising receiving information related to the signal-to-interference-plus-noise ratio (SINR) of a channel from a receiver device, and wherein identifying a modulation scheme comprises identifying QAM as the modulation scheme if the SINR is greater than or equal to a threshold value. ### Claim 4 (depends on 1) The method of claim 1, further comprising: interleaving the modulated symbol; and scrambling the modulated symbol on a subcarrier basis. ### Claim 5 (depends on 4) The method of claim 4, further comprising: identifying fading effect of the scrambled subcarrier; and mapping transmission resource of the subcarrier such that fading effect of the subcarrier corresponds to each other. ### Claim 6 A method of signal reception for a receiver device in a mobile communication system, the method comprising: receiving, from a transmitter device, a signal; identifying the modulation scheme of the received signal; identifying a sequence corresponding to the received signal from a sequence set used to modulate the received signal based on the modulation scheme and a correlator associated with the sequence set; and demodulating the received signal based on the identified sequence and the log likelihood ratio (LLR) corresponding to the received signal. ### Claim 7 (depends on 6) The method of claim 6, further comprising: identifying the interleaving scheme applied to the received signal; and deinterleaveing the received signal based on the interleaving scheme. ### Claim 8 (depends on 6) The method of claim 6, further comprising: identifying the scrambling scheme on a subcarrier basis applied to the received signal; and descrambling the received signal on a subcarrier based on the scrambling scheme. ### Claim 9 A transmitter device in a mobile communication system, comprising: a transceiver configured to transmit and to receive a signal; and a controller configured to: control the transceiver, identify a modulation scheme for data transmission, identify a level for quadrature amplitude modulation (QAM) based on the identified modulation scheme, identify an amplitude and phase of a carrier wave based on the QAM level and data to be transmitted, and identifying, if the identified modulation scheme is a first scheme, a length of sequences, selecting a sequence according to the data to be transmitted among sequences of the identified length, and generate modulated symbol corresponding to the data to be transmitted based on the selected sequence, the amplitude of the carrier wave and the phase of the carrier wave. ### Claim 10 (depends on 9) The transmitter device of claim 9, wherein the controller is further configured to modulate, if the identified modulation scheme is a second scheme, the data to be transmitted based on the amplitude of the carrier wave and phase of the carrier wave. ### Claim 11 (depends on 9) The transmitter device of claim 9, wherein the controller is further configured to receive information related to the signal-to-interference-plus-noise ratio (SINR) of a channel from a receiver device, and wherein identifying a modulation scheme comprises identifying QAM as the modulation scheme if the SINR is greater than or equal to a threshold value. ### Claim 12 (depends on 9) The transmitter device of claim 9, wherein the controller is further configured to: interleave the modulated symbol, and scramble the modulated symbol on a subcarrier basis. ### Claim 13 (depends on 9) The transmitter device of claim 9, wherein the controller is further configured to: identify fading effect of the scrambled subcarrier, and map transmission resource of the subcarrier such that fading effect of the subcarrier corresponds to each other. ### Claim 14 A receiver device in a mobile communication system, comprising: a transceiver configured to transmit and receive a signal; and a controller configured to: control the transceiver, receive, from a transmitter device, a signal identify the modulation scheme of the received signal identify a sequence corresponding to the received signal from a sequence set used to modulate the received signal based on the modulation scheme and a correlator associated with the sequence set; and demodulate the received signal based on the identified sequence and the log likelihood ratio (LLR) corresponding to the received signal. ### Claim 15 (depends on 14) The receiver device of claim 14, wherein the controller further configured to: identify the interleaving scheme applied to the received signal, and deinterleave the received signal based on the interleaving scheme. ### Claim 16 (depends on 14) The receiver device of claim 14, wherein the controller further configured to: identify the scrambling scheme on a subcarrier basis applied to the received signal, and descramble the received signal on a subcarrier based on the scrambling scheme.