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WO 2017/189316 Al 02 November 2017 (02.11.2017) W ! P O PCT

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WO 2017/189316 Al 02 November 2017 (02.11.2017) W ! P O PCT (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2017/189316 Al 02 November 2017 (02.11.2017) W ! P O PCT (51) International Patent Classification: (74) Agent: NACCARELLA, Theodore; 200 Bellevue Park H04L 27/26 (2006.01) way, Suite 300, Wilmington, DE 19809 (US). (21) International Application Number: (81) Designated States (unless otherwise indicated, for every PCT/US20 17/028549 kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, (22) International Filing Date: CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, 20 April 2017 (20.04.2017) DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, (25) Filing Language: English HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, (26) Publication Langi English MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, (30) Priority Data: PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, 62/327,259 25 April 2016 (25.04.2016) US SD, SE, SG, SK, SL, SM, ST, SV, SY,TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (71) Applicant: IDAC HOLDINGS, INC. [US/US]; 200 Belle- vue Parkway, Suite 300, Wilmington, DE 19809 (US). (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, (72) Inventors: SAHIN, Alphan; 2 Huntington Quadrangle, 4th GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, Floor South, Melville, NY 11747 (US). BELURI, Mihaela, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, C ; 2 Huntington Quadrangle 4th Floor, South, Melville, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, NY 11747 (US). YANG, Rui; 2 Huntington Quadrangle EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, 4th Floor, South, Melville, NY 11747 (US). BALA, Er- MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, dem; 2 Huntington Quadrangle 4th Floor, South, Melville, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, NY 11747 (US). HAGHIGHAT, Afshin; 1000 Sherbrooke KM, ML, MR, NE, SN, TD, TG). Street West 10th Floor, Montreal, Quebec H3A 3G4 (CA). (54) Title: APPARATUS AND METHODS FOR NON-SYSTEMATIC COMPLEX CODED DISCRETE FOURIER TRANSFORM SPREAD ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING Permutation 907 - r Interleaved subcarriers 905 901 0 d 0 D 9 1 905 Π ! DFT IDFT ' Tail Cancellation 909 < 903 FIG. 9 00 o (57) Abstract: The invention pertains to methods and apparatus for non- systematic complex coded unique word DFT spread orthogonal frequency division multiplexing. o [Continued on nextpage] WO 2017/189316 Al llll II II 11III I II I II 11III I III III II I II Published: Apparatus and Methods for Non-Systematic Complex Coded Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing Field [0001] The invention pertains to waveforms for use in wireless communications systems. Background [0002] The structure of an air interface is one of the decisive factors in meeting the performance goals of a wireless communication system. At the same time, designing an air interface comes with many challenges in order to meet various distinct performance goals such as high spectral efficiency, robustness against adverse channel conditions, utilization of user diversity, fast feedback mechanisms, low latency, and less complexity at the transmitter and receiver. [0003] The 5th generation telecommunication system protocol (hereinafter 5G) that is currently under development by the 3rd Generation Partnership Project (hereinafter 3GPP) is one example of a radio telecommunications system that would benefit from an air interface meeting the aforementioned performance goals. Summary [0004] The invention pertains to methods and apparatus for non-systematic complex coded DFT spread orthogonal frequency division multiplexing. [0005] In accordance with a first aspect, a method and apparatus of operation in a wireless network node is described for generating discrete Fourier transformation (DFT) spread orthogonal frequency division multiplexing (DFT-S-OFDM) symbols comprising: mapping a first symbol vector to inputs of a DFT-spread block using a permutation matrix, wherein the first, symbol vector comprises a plurality of modulated symbols to be transmitted within a block; inserting known symbols into the mapped first, symbol vector to produce a second vector, the known symbols mapped to inputs of the DFT-spread block to which symbols in the first, symbol vector are not mapped; inserting a perturbation into the second vector to produce a third vector; performing a DFT on the third vector to produce a fourth vector, wherein the perturbation is configured to generate zeros on predetermined elements of the fourth vector; performing an inverse l DFT (IDFT) operation on the fourth vector to produce an IDFT output signal; cancelling a tail of the IDFT output signal to produce a modified IDFT output signal; and transmiting the modified IDFT output signal. [0006] In accordance with another aspect, a method and apparatus of operation in a wireless network node is described for receiving discrete Fourier transformation (DFT) spread orthogonal frequency division multiplexing (DFT-S-OFDM) symbols comprising: receiving the DFT-S-OFDM symbols at an antenna; determining a DFT of the received symbols; replacing symbols in the received DFT-S-OFDM symbols that correspond to predetermined elements in the DFT-S-OFDM symbols with zeros and performing an inverse DFT on the remaining received symbols; determining a distortion vector on the symbols in the received DFT-S-OFDM symbols that correspond to predetermined elements; and subtracting the distortion vector from the remaining symbols. Drawings [0007] A more detailed understanding may be had from the Detailed Description below, given by way of example in conjunction with drawings appended hereto. Figures in such drawings, like the detailed description, are examples. As such, the Figures and the detailed description are not to be considered limiting, and other equally effective examples are possible and likely. [0008] Furthermore, like reference numerals in the Figures indicate like elements, and wherein: [0009] FIG. 1 is a block diagram illustrating a standard DFT-S-OFDM transmitter structure; [0010] FIG. 2 is a block diagram illustrating a ZT DFT-S-OFDM transmitter structure; [001 1] FIG. 3A is a block diagram illustrating a UW-OFDM transmitter structure with tail suppression with systematic complex coding; [0012] FIG. 3B is a block diagram illustrating a UW-OFDM transmitter structure with tail suppression with non-systematic complex coding; [0013] FIG. 4 is a diagram illustrating tail cancellation in accordance with the scheme of FIG. 3A; [0014] FIG. 5 is a block diagram illustrating a UW DFT-S-OFDM transmitter structure and receiver structure; [0015] FIG. 6A is a block diagram illustrating a static DFT-S-OFDM transmitter structure; [0016] FIG. 6B is a diagram illustrating tail cancellation in accordance with the scheme of FIG. 6A; [0017] FIG. 7 is a block diagram illustrating tail cancellation at the transmitter in accordance with a first embodiment; [0018] FIG. 8 is a block diagram further illustrating the receiver in connection with the tail cancellation process; [0019] FIG. 9 is a block diagram illustrating a non-systematic complex coded UW DFT- SW-OFDM transmitter structure in accordance with an embodiment; [0020] FIGS. 10A, 10B, and 10C are block diagrams illustrating three equivalent functional structures for a transmitter for periodic self-interference in accordance with an embodiment; [0021] FIG. 11 is a more detailed block diagram illustrating a portion of the non- systematic complex coded UW DFT-SW-OFDM transmitter structure of FIG. 9 ; [0022] FIG. 12 is a block diagram illustrating a non-systematic complex coded UW DFT-SW-OFDM receiver structure in accordance with an embodiment; [0023] FIG. 13 is a block diagram illustrating the transmitter structure and the receiver structure in accordance with an embodiment further including the use of UW and guard bands; [0024] FIG. 14 is a diagram illustrating a scheme for exploiting the existence of UW in connection with a low-complexity implementation of the convolution operation; [0025] FIG. 15 is a block diagram illustrating the overall transmitter structure and receiver structure in accordance with an exemplary embodiment; [0026] FIG. 16A is a graph showing a comparison of average energy for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S- OFDM for a filter length of 64 according to simulations; [0027] FIG. 16B is a graph showing a comparison of average energy for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S- OFDM for a filter length of 128 according to simulations; [0028] FIG. 17A is a graph showing a comparison of average energy for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S- OFDM with UWfor a filter length of 64 according to simulations; [0029] FIG. 17B is a graph showing a comparison of average energy for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S- OFDM with UWfor a filter length of 128 according to simulations; [0030] FIG. 18A is a graph showing a comparison of power spectral density for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S-OFDM with UWfor a filter length of 64 according to simulations; [0031] FIG. 18B is a graph showing a comparison of power spectral density for CP OFDM, ZT DFT-S-OFDM, UW DFT-S-OFDM, and non-systematic complex coded UW DFT-S-OFDM with UWfor a filter length of 128 according to simulations; [0032] FIG.
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