Search

CN-122029790-A - Method and apparatus for spectral shaping for DFT-S-OFDM in a wireless communication system

CN122029790ACN 122029790 ACN122029790 ACN 122029790ACN-122029790-A

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. An apparatus includes a processor and a transceiver operatively connected to the processor. The transceiver is configured to split a set of modulated data symbols based on phase changes between N consecutive modulated data symbols to produce Q sets of data symbols and to generate Q sets of DFT-spread data symbols based on the Q sets of data symbols. The transceiver is further configured to Frequency Domain Spectral Shaping (FDSS) filter each of the Q sets of DFT spread data symbols via a different FDSS filter to produce Q sets of FDSS filtered data symbols, and to combine the Q sets of FDSS filtered data symbols. The transceiver is further configured to perform an Inverse Fast Fourier Transform (IFFT) operation on the combined Q sets of FDSS filtered data symbols to produce an FDSS discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) signal and to transmit the FDSS-DFT-s-OFDM signal.

Inventors

  • Sohail Shahram Rostami
  • ZHAO JUNYING

Assignees

  • 三星电子株式会社

Dates

Publication Date
20260512
Application Date
20241113
Priority Date
20241107

Claims (15)

  1. 1. An apparatus in wireless communication, comprising: Processor, and A transceiver coupled to the processor and configured to: Dividing a set of modulated data symbols based on phase changes between N consecutive modulated data symbols to produce Q sets of data symbols; Generating a Q group DFT-spread data symbol based on the Q group data symbol; FDSS filtering each of the Q sets of DFT spread data symbols via a different frequency domain spectral shaping FDSS filter to produce Q sets of FDSS filtered data symbols; combining the Q sets of FDSS filtered data symbols; Performing an inverse fast fourier transform, IFFT, operation on the combined Q groups of FDSS filtered data symbols to produce an FDSS discrete fourier transform spread orthogonal frequency division multiplexing, DFT-s-OFDM, signal, and And transmitting the FDSS-DFT-s-OFDM signal.
  2. 2. The apparatus according to claim 1, Wherein the set of modulated data symbols is passed through Binary phase shift keying BPSK modulated, Wherein n=2 and q=2, Wherein, to generate the Q-group data symbols, the transceiver is further configured to segment the set of modulated data symbols to generate a-pi/2 phase change set and a +pi/2 phase change set, and Wherein to generate Q groups of DFT-spread data symbols based on the Q groups of data symbols, the transceiver is further configured to: Multiplying the elements of the-pi/2 phase change set by j and adding the resulting elements to the corresponding elements of the +pi/2 phase change set to produce a set of combined symbols; performing DFT spreading on the set of combined symbols to produce a set of DFT-spread output symbols; Half the sum of the conjugates of the DFT-spread output symbols and the shifted DFT-spread output symbols to produce a first set of DFT-spread data symbols, and Multiplying a difference between the DFT-spread output symbol and the conjugate of the shifted DFT-spread output symbol by-j/2 to produce a second set of DFT-spread data symbols, Wherein the Q group of DFT-spread data symbols comprises the first group of DFT-spread data symbols and the second group of DFT-spread data symbols.
  3. 3. The device of claim 2, wherein to FDSS filter each of the Q groups of DFT-spread data symbols via a different FDSS filter, the transceiver is further configured to: FDSS filtering the first set of DFT spread data symbols via a first FDSS filter, and FDSS filtering the first set of DFT-spread data symbols via a second FDSS filter, Wherein the second FDSS filter is a conjugate inverted frequency version of the first FDSS filter.
  4. 4. The device of claim 1, wherein the transceiver is further configured to: Before FDSS filtering each of the Q groups of DFT-spread data symbols, adding a predefined number of subcarriers to each of the Q groups of DFT-spread data symbols, Wherein the predefined number of subcarriers is equal for each of the Q groups of DFT spread data symbols, an Wherein the total number of subcarriers added to the Q-group DFT-spread data symbols is used as the length of the IFFT operation.
  5. 5. The apparatus of claim 1, wherein to generate a Q-group DFT spread data symbol based on the Q-group data symbol, the transceiver is further configured to discrete Fourier transform DFT spread the Q-group data symbol to generate a Q-group DFT spread data symbol, Wherein the set of modulated data symbols is QPSK modulated by quadrature phase shift keying, Where q=4 and n=2.
  6. 6. A method performed by a device, the method comprising: Dividing a set of modulated data symbols based on phase changes between N consecutive modulated data symbols to produce Q sets of data symbols; Generating a Q group DFT-spread data symbol based on the Q group data symbol; FDSS filtering each of the Q sets of DFT spread data symbols via a different frequency domain spectral shaping FDSS filter to produce Q sets of FDSS filtered data symbols; combining the Q sets of FDSS filtered data symbols; Performing an inverse fast fourier transform, IFFT, operation on the combined Q groups of FDSS filtered data symbols to produce an FDSS discrete fourier transform spread orthogonal frequency division multiplexing, DFT-s-OFDM, signal, and And transmitting the FDSS-DFT-s-OFDM signal.
  7. 7. The method according to claim 6, wherein the method comprises, Wherein the set of modulated data symbols is passed through Binary phase shift keying BPSK modulated, Wherein n=2 and q=2, Wherein to generate the Q-group of data symbols, the method further comprises dividing the group of modulated data symbols to generate a-pi/2 phase change set and a +pi/2 phase change set, and Wherein to generate a Q group of DFT-spread data symbols based on the Q group of data symbols, the method further comprises: Multiplying the elements of the-pi/2 phase change set by j and adding the resulting elements to the corresponding elements of the +pi/2 phase change set to produce a set of combined symbols; performing DFT spreading on the set of combined symbols to produce a set of DFT-spread output symbols; Half the sum of the conjugates of the DFT-spread output symbols and the shifted DFT-spread output symbols to produce a first set of DFT-spread data symbols, and Multiplying a difference between the DFT-spread output symbol and the conjugate of the shifted DFT-spread output symbol by-j/2 to produce a second set of DFT-spread data symbols, Wherein the Q group of DFT-spread data symbols comprises the first group of DFT-spread data symbols and the second group of DFT-spread data symbols.
  8. 8. The method of claim 7, wherein to FDSS filter each of the Q groups of DFT-spread data symbols via a different FDSS filter, the method further comprises: FDSS filtering the first set of DFT spread data symbols via a first FDSS filter, and FDSS filtering the first set of DFT-spread data symbols via a second FDSS filter, Wherein the second FDSS filter is a conjugate inverted frequency version of the first FDSS filter.
  9. 9. The method of claim 6, further comprising: Before FDSS filtering each of the Q groups of DFT-spread data symbols, adding a predefined number of subcarriers to each of the Q groups of DFT-spread data symbols, Wherein the predefined number of subcarriers is equal for each of the Q groups of DFT spread data symbols, an Wherein the total number of subcarriers added to the Q-group DFT-spread data symbols is used as the length of the IFFT operation.
  10. 10. The method of claim 6, wherein to generate a Q-group DFT spread data symbol based on the Q-group data symbol, the method further comprises performing a discrete Fourier transform DFT spread on the Q-group data symbol to generate a Q-group DFT spread data symbol, Wherein the set of modulated data symbols is QPSK modulated by quadrature phase shift keying, and Where q=4 and n=2.
  11. 11. A user equipment, UE, comprising: Processor, and A transceiver coupled to the processor and configured to: Receiving a first message enabling frequency domain spectrum shaping, FDSS, discrete Fourier transform, spread orthogonal frequency division multiplexing, DFT-s-OFDM, capability of the UE; receiving a second message configuring the FDSS-DFT-s-OFDM capability for uplink transmission, and In response to receiving the second message: partitioning a set of modulated data symbols for the uplink transmission based on phase changes between N consecutive modulated data symbols to produce Q sets of data symbols; Generating a Q group DFT-spread data symbol based on the Q group data symbol; FDSS filtering each of the Q sets of DFT spread data symbols via a different FDSS filter to produce Q sets of FDSS filtered data symbols; combining the Q sets of FDSS filtered data symbols; performing an inverse fast fourier transform, IFFT, operation on the combined Q groups of FDSS filtered data symbols to produce an FDSS-DFT-s-OFDM signal, and And transmitting the FDSS-DFT-s-OFDM signal.
  12. 12. The UE of claim 11, Wherein the transceiver is further configured to: receiving a third message including information requesting UE capability information before receiving the first message and the second message, and Transmitting a fourth message including information indicating the FDSS-DFT-s-OFDM capability of the UE, Wherein to generate a Q group of DFT-spread data symbols based on the Q group of data symbols, the transceiver is further configured to discrete fourier transform, DFT, spread the Q group of data symbols to generate a Q group of DFT-spread data symbols.
  13. 13. The UE of claim 11, wherein for each of the Q groups, the second message indicates a particular FDSS filter for FDSS filtering the group.
  14. 14. The UE of claim 11, wherein the second message indicates a set of FDSS filters for FDSS filtering each of the Q sets of DFT-spread data symbols.
  15. 15. The UE of claim 11, Wherein the set of modulated data symbols is passed through Binary phase shift keying BPSK modulated, Wherein n=2 and q=2, Wherein, to generate the Q-group data symbols, the transceiver is further configured to segment the set of modulated data symbols for the uplink transmission to generate a-pi/2 phase change set and a +pi/2 phase change set, and Wherein to generate Q groups of DFT-spread data symbols based on the Q groups of data symbols, the transceiver is further configured to: Multiplying the elements of the-pi/2 phase change set by j and adding the resulting elements to the corresponding elements of the +pi/2 phase change set to produce a set of combined symbols; performing DFT spreading on the set of combined symbols to produce a set of DFT-spread output symbols; Half the sum of the conjugates of the DFT-spread output symbols and the shifted DFT-spread output symbols to produce a first set of DFT-spread data symbols, and Multiplying a difference between the DFT-spread output symbol and the conjugate of the shifted DFT-spread output symbol by-j/2 to produce a second set of DFT-spread data symbols, Wherein the Q group of DFT-spread data symbols comprises the first group of DFT-spread data symbols and the second group of DFT-spread data symbols.

Description

Method and apparatus for spectral shaping for DFT-S-OFDM in a wireless communication system Technical Field The present disclosure relates generally to wireless networks. More particularly, the present disclosure relates to a method and apparatus for spectral shaping for discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) in a wireless communication system. Background In view of the generation development of wireless communication, technologies mainly used for services for humans, such as voice calls, multimedia services, and data services, have been developed. After commercialization of a 5G (5 th generation) communication system, it is expected that the number of connection devices will increase exponentially. These devices will increasingly be connected to communication networks. Examples of networking things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructure, construction machinery, and factory equipment. Mobile devices are expected to evolve in a variety of form factors, such as augmented reality glasses, virtual reality headphones, and hologram devices. In order to provide various services by connecting billions of devices and things in the 6G (6 th generation) age, efforts have been made to develop an improved 6G communication system. For these reasons, 6G communication systems are referred to as super 5G systems. It is expected that a 6G communication system that will be commercialized around 2030 will have a peak data rate of the order of bits per second (bps) of too (1,000 gigabits) and a wireless latency of less than 100 musec, and thus will be 50 times faster and have a wireless latency of 1/10 of that of a 5G communication system. To achieve such high data rates and ultra-low latency, it has been considered to implement 6G communication systems in the terahertz (THz) band (e.g., the 95 gigahertz (GHz) to 3THz band). It is expected that a technique of securing a signal transmission distance (i.e., coverage) will become more critical since path loss and atmospheric absorption in the terahertz frequency band are more serious than those in the millimeter wave frequency band introduced in 5G. There is a need to open transmit frequency (RF) elements, antennas, new waveforms with better coverage than Orthogonal Frequency Division Multiplexing (OFDM) schemes, beamforming and massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and multi-antenna transmission techniques such as massive antennas as main techniques for securing coverage. In addition, new technologies are constantly being discussed regarding improving coverage of terahertz band signals, such as metamaterial-based lenses and antennas, orbital Angular Momentum (OAM), and reconfigurable smart surfaces (RIS). Further, in order to improve spectral efficiency and overall network performance, technologies for 6G communication systems have been developed for implementing full duplex technology for uplink transmission and downlink transmission to simultaneously use the same frequency resources at the same time, network technologies for utilizing satellites, high Altitude Platforms (HAPS), etc. in an integrated manner, improved network structures for supporting mobile base stations, etc. and implementing network operation optimization and automation, etc., dynamic spectrum sharing technology via collision avoidance based on prediction of spectrum usage, use of Artificial Intelligence (AI) in wireless communication to improve overall network operation by utilizing AI from a design stage of developing 6G and internalizing end-to-end AI support functions, next generation distributed computing technologies for overcoming the limit of UE computing capability by achievable ultra-high performance communication and computing resources on the network such as Mobile Edge Computing (MEC), cloud, etc. In addition, attempts are being continued to strengthen connectivity between devices, optimize networks, promote the software of network entities, and improve the openness of wireless communications by designing new protocols to be used in 6G communication networks, developing mechanisms for achieving a hardware-based secure environment and secure use of data, and developing techniques for maintaining privacy. It is expected that research and development of super-connected 6G communication systems, including person-to-machine (P2M) and machine-to-machine (M2M), will enable the following super-connection experience. In particular, services such as true immersive augmented reality (XR), high fidelity mobile holograms, and digital replicas are contemplated to be provided through 6G communication systems. In addition, services such as teleoperation, industrial automation and emergency response with enhanced safety and reliability will be provided through the 6G communication system, so that technologies can be applied in vario