Method and system for providing code cover to OFDM symbols in multiple user system
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| Název: | Method and system for providing code cover to OFDM symbols in multiple user system |
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| Patent Number: | 11929,863 |
| Datum vydání: | March 12, 2024 |
| Appl. No: | 17/739639 |
| Application Filed: | May 09, 2022 |
| Abstrakt: | The present disclosure discloses a method and a system for providing a code cover to Orthogonal Frequency Division Multiplexing (OFDM) symbols in a multiple user system. A data sequence is received from each of a plurality of users. Further, a reference sequence is generated for the data sequence of each of the plurality of users. Each of the reference sequence is multiplied with a code cover which are orthogonal to each other. Each of the reference sequence is time-multiplexed with corresponding data sequence, to generate a corresponding multiplexed sequence. Further, a Discrete Fourier Transform (DFT) is performed on each of the multiplexed sequence to generate a corresponding DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol. Lastly, the corresponding DFT-s-OFDM symbol is processed for transmitting over corresponding one or more channels. |
| Inventors: | WISIG NETWORKS PRIVATE LIMITED (Telangana, IN) |
| Assignees: | WISIG NETWORKS PRIVATE LIMITED (IN) |
| Claim: | 1. A method for generating a waveform in a communication network, the method comprising: receiving, by a transmitter, a data sequence and a binary phase shift keying reference sequence (BPSK-RS); applying, by the transmitter, a cover code to the BPSK-RS; rotating, by the transmitter, the BPSK-RS by 90 degrees between successive elements to generate a rotated BPSK-RS; time-multiplexing, by the transmitter, the rotated BPSK-RS with the data sequence to generate a multiplexed sequence associated with the transmitter; and transforming, by the transmitter, the multiplexed sequence, in a time domain, using a Discrete Fourier Transform (DFT) to generate a transformed multiplexed sequence comprising one or more DFT-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbols, in a frequency domain. |
| Claim: | 2. The method of claim 1 , comprising applying a frequency domain pulse shaping filter to the transformed multiplexed sequence. |
| Claim: | 3. The method of claim 1 , comprising precoding the multiplexed sequence prior to the transforming. |
| Claim: | 4. The method of claim 1 , comprising transmitting the DFT-s-OFDM symbol. |
| Claim: | 5. The method of claim 1 , wherein the code cover is one of a binary phase shift keying (BPSK) sequence and a Walsh Hadamard sequence. |
| Claim: | 6. The method of claim 1 , wherein the data sequence is one of a Pi/2 BPSK sequence, a Quadrature Phase Shift Keying (QPSK) sequence and a Quadrature Amplitude Modulation (QAM) sequence. |
| Claim: | 7. The method of claim 1 , wherein the applying operation is one of a spreading operation and a multiplication operation. |
| Claim: | 8. The method of claim 1 , wherein the one or more DFT-s-OFDM symbols is precoded using one of a 1+D precoder and a Q-tap polynomial precoder to obtain a precoded DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 9. The method of claim 1 , wherein the transformed multiplexed sequence is applied with a frequency domain filter using the DFT of one of a 1+D precoder and a Q-tap polynomial precoder to obtain the DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 10. The method of claim 1 , comprising: mapping the one or more DFT-s-OFDM symbols with subcarriers to generate one or more mapped symbols; and performing an Inverse Fast Fourier Transform (IFFT) on the one or more mapped symbols to produce one or more time domain symbols. |
| Claim: | 11. The method of claim 1 , wherein the method comprises: performing a time domain pulse shaping on the one or more DFT-s-OFDM symbols to generate pulse shaped DFT-s-OFDM symbols. |
| Claim: | 12. The method of claim 1 , wherein the method comprises: performing a frequency domain pulse shaping on the one or more DFT-s-OFDM symbols to generate pulse shaped DFT-s-OFDM symbols. |
| Claim: | 13. The method of claim 1 , wherein the transmitter is operable to: perform a frequency domain pulse shaping on the one or more DFT-s-OFDM symbols to generate pulse shaped DFT-s-OFDM symbols. |
| Claim: | 14. The method of claim 10 , wherein the method comprises: performing a time domain pulse shaping on the one or more time domain symbols. |
| Claim: | 15. The method of claim 10 , wherein the method comprises: performing a frequency domain pulse shaping on the one or more mapped symbols. |
| Claim: | 16. A system for generating a waveform in a communication network, the system comprising: a transmitter operable to: generate a data sequence and a binary phase shift keying reference sequence (BPSK-RS); apply a cover code to the BPSK-RS; rotate the BPSK-RS by 90 degrees between successive elements to generate a rotated BPSK-RS; time-multiplex the rotated BPSK-RS with the data sequence to generate a multiplexed sequence associated with the transmitter; and transform the multiplexed sequence, in a time domain, using a Discrete Fourier Transform (DFT) to generate a transformed multiplexed sequence comprising one or more DFT-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbols, in a frequency domain. |
| Claim: | 17. The system of claim 16 , wherein the transmitter is operable to apply a frequency domain pulse shaping filter to the transformed multiplexed sequence. |
| Claim: | 18. The system of claim 16 , wherein the transmitter is operable to precode the multiplexed sequence prior to the transforming. |
| Claim: | 19. The system of claim 16 , wherein the transmitter is operable to transmit the DFT-s-OFDM symbol. |
| Claim: | 20. The system of claim 16 , wherein the code cover is one of a binary phase shift keying (BPSK) sequence and a Walsh Hadamard sequence. |
| Claim: | 21. The system of claim 16 , wherein the data sequence is one of a Pi/2 BPSK sequence, a Quadrature Phase Shift Keying (QPSK) sequence and a Quadrature Amplitude Modulation (QAM) sequence. |
| Claim: | 22. The system of claim 16 , wherein the applying operation is one of a spreading operation and a multiplication operation. |
| Claim: | 23. The system of claim 16 , wherein the one or more DFT-s-OFDM symbols is precoded using one of a 1+D precoder and a Q-tap polynomial precoder to obtain a precoded DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 24. The system of claim 16 , wherein the transformed multiplexed sequence is applied with a frequency domain filter using the DFT of one of a 1+D precoder and a Q-tap polynomial precoder to obtain the DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 25. The system of claim 16 , wherein the transmitter is operable to: map the one or more DFT-s-OFDM symbols with subcarriers to generate one or more mapped symbols; and perform an Inverse Fast Fourier Transform (IFFT) on the one or more mapped symbols to produce a-one or more time domain symbols. |
| Claim: | 26. The system of claim 16 , wherein the transmitter is operable to: perform a time domain pulse shaping on the one or more DFT-s-OFDM symbols to generate pulse shaped DFT-s-OFDM symbols. |
| Claim: | 27. The system of claim 25 , wherein the transmitter is operable to: perform a time domain pulse shaping on the one or more time domain symbols. |
| Claim: | 28. The system of claim 25 , wherein the transmitter is operable to: perform a frequency domain pulse shaping on the one or more mapped symbols. |
| Claim: | 29. A method for processing a waveform in a communication network, the method comprising: generating a time domain multiplexed sequence, via an Inverse Discrete Fourier Transform (IDFT) of a frequency domain signal comprising one or more DFT-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbols; de-multiplexing the time domain multiplexed sequence to generate a rotated binary phase shift keying reference sequence (BPSK-RS) and a data sequence; de-rotating the rotated BPSK-RS to generate a BPSK-RS; and removing a cover code from the BPSK-RS. |
| Claim: | 30. The method of claim 29 , wherein the frequency domain signal is shaped by a frequency domain pulse shaping filter. |
| Claim: | 31. The method of claim 29 , comprising removing precoding from the frequency domain signal. |
| Claim: | 32. The method of claim 29 , comprising receiving the one or more DFT-s-OFDM symbols. |
| Claim: | 33. The method of claim 29 , wherein the code cover is one of a binary phase shift keying (BPSK) sequence and a Walsh Hadamard sequence. |
| Claim: | 34. The method of claim 29 , wherein the data sequence is one of a Pi/2 BPSK sequence, a Quadrature Phase Shift Keying (QPSK) sequence and a Quadrature Amplitude Modulation (QAM) sequence. |
| Claim: | 35. The method of claim 29 , wherein the removing operation is one of a despreading operation and a multiplication operation. |
| Claim: | 36. The method of claim 29 , wherein the one or more DFT-s-OFDM symbols is precoded using one of a 1+D precoder and a Q-tap polynomial precoder to obtain a precoded DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 37. The method of claim 29 , wherein the frequency domain signal is shaped by a frequency domain filter using the DFT of one of a 1+D precoder and a Q-tap polynomial precoder to obtain the DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 38. The method of claim 29 , comprising: performing a Fast Fourier Transform (FFT) on one or more time domain symbols to generate one or more mapped symbols; and de-mapping subcarriers from the one or more mapped symbols to generate the one or more DFT-s-OFDM symbols. |
| Claim: | 39. The method of claim 29 , wherein: the one or more DFT-s-OFDM symbols are shaped by a time domain pulse shaping filter. |
| Claim: | 40. The method of claim 29 , wherein: the one or more DFT-s-OFDM symbols are shaped by a time domain pulse shaping filter. |
| Claim: | 41. The method of claim 29 , wherein: the one or more DFT-s-OFDM symbols are shaped by a frequency domain pulse shaping filter. |
| Claim: | 42. The method of claim 38 , wherein: the one or more time domain symbols are shaped by a time domain pulse shaping filter. |
| Claim: | 43. The method of claim 38 , wherein the method comprises: the one or more mapped symbols are shaped by a frequency domain pulse shaping filter. |
| Claim: | 44. A system for generating a waveform in a communication network, the system comprising: a receiver operable to: generate a time domain multiplexed sequence, via an Inverse Discrete Fourier Transform (IDFT) of a frequency domain signal comprising one or more DFT-Spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbols; de-multiplex the time domain multiplexed sequence to generate a rotated binary phase shift keying reference sequence (BPSK-RS) and a data sequence; de-rotate the rotated BPSK-RS to generate a BPSK-RS; and remove a cover code from the BPSK-RS. |
| Claim: | 45. The system of claim 44 , wherein the frequency domain signal is shaped by a frequency domain pulse shaping filter. |
| Claim: | 46. The system of claim 44 , wherein the receiver is operable to remove a precoding from the frequency domain signal. |
| Claim: | 47. The system of claim 44 , wherein the receiver is operable to receive the DFT-s-OFDM symbol. |
| Claim: | 48. The system of claim 44 , wherein the code cover is one of a binary phase shift keying (BPSK) sequence and a Walsh Hadamard sequence. |
| Claim: | 49. The system of claim 44 , wherein the data sequence is one of a Pi/2 BPSK sequence, a Quadrature Phase Shift Keying (QPSK) sequence and a Quadrature Amplitude Modulation (QAM) sequence. |
| Claim: | 50. The system of claim 44 , wherein the remove operation is one of a despread operation and a multiply operation. |
| Claim: | 51. The system of claim 44 , wherein the one or more DFT-s-OFDM symbols is precoded using one of a 1+D precoder and a Q-tap polynomial precoder to obtain a precoded DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 52. The system of claim 44 , wherein the frequency domain signal is shaped by a frequency domain filter using the DFT of one of a 1+D precoder and a Q-tap polynomial precoder to obtain the DFT-s-OFDM symbol, and wherein D is the delay unit and Q is one of 1, 2 and 3. |
| Claim: | 53. The system of claim 44 , wherein the receiver is operable to: perform a Fast Fourier Transform (FFT) on one or more time domain symbols to generate one or more mapped symbols; and de-map subcarriers from the one or more mapped symbols to generate the one or more DFT-s-OFDM symbols. |
| Claim: | 54. The system of claim 44 , wherein: the one or more DFT-s-OFDM symbols are shaped by a time domain pulse shaping filter. |
| Claim: | 55. The system of claim 53 , wherein: the one or more time domain symbols are shaped by a time domain pulse shaping filter. |
| Claim: | 56. The system of claim 53 , wherein: the one or more mapped symbols are shaped by a frequency domain pulse shaping filter. |
| Patent References Cited: | 7664193 February 2010 Jalali et al. 11025471 June 2021 Kuchi 11206166 December 2021 Kuchi 11245562 February 2022 Zeng 11343129 May 2022 Kuchi 20160254889 September 2016 Shattil |
| Other References: | Iith et al., “Comparison of pi/2 BPSK with and without frequency domain pulse shaping; Results with PA model”, 3GPP TSG-RAN WG1 Ad-Hoc NR Meeting, R1-1700849, Spokane, WA, USA, Jan. 16-20, 2017 (Year: 2017). cited by examiner K. Kuchi, “Partial Response DFT-precoded-OFDM Modulation,” IEEE Trans. on Emerging Tele. Tech., May 2012. cited by applicant F. Khan, “LTE for 4G Mobile Broadband Air Interface Technologies and Performance.” New York, NY: Cambridge University Press, 2009. cited by applicant Iith et al., “Comparison of pi/2 BPSK with and without frequency domain pulse shaping: Results with PA model,” 3GPP TSG-RAN WG1 Ad-Hoc NR Meeting, R1-1701180, Spokane, WA, USA, Jan. 16-20, 2017. cited by applicant Int'l Search Report Appln No. PCT/IN2018/050031 dated May 18, 2018. cited by applicant |
| Primary Examiner: | O Connor, Brian T |
| Attorney, Agent or Firm: | McAndrews, Held & Malloy, Ltd. |
| Přístupové číslo: | edspgr.11929863 |
| Databáze: | USPTO Patent Grants |
| Abstrakt: | The present disclosure discloses a method and a system for providing a code cover to Orthogonal Frequency Division Multiplexing (OFDM) symbols in a multiple user system. A data sequence is received from each of a plurality of users. Further, a reference sequence is generated for the data sequence of each of the plurality of users. Each of the reference sequence is multiplied with a code cover which are orthogonal to each other. Each of the reference sequence is time-multiplexed with corresponding data sequence, to generate a corresponding multiplexed sequence. Further, a Discrete Fourier Transform (DFT) is performed on each of the multiplexed sequence to generate a corresponding DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol. Lastly, the corresponding DFT-s-OFDM symbol is processed for transmitting over corresponding one or more channels. |
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