公开(公告)号：US10003435B2

公开(公告)日：2018-06-19

申请号：US15361160

申请日：2016-11-25

Applicant: TELEFONICA, S.A.

Inventor： Javier Lorca Hernando

IPC: H04W4/00 ,  H04L1/00 ,  H04L5/00 ,  H04L29/06 ,  H03M13/29 ,  H03M13/37 ,  H03M13/00 ,  H04L1/20 ,  H03M13/11

CPC classification number: H04L1/0042 ,  H03M13/1128 ,  H03M13/2948 ,  H03M13/2957 ,  H03M13/3738 ,  H03M13/3753 ,  H03M13/612 ,  H04L1/005 ,  H04L1/201 ,  H04L5/0007 ,  H04L69/22

Abstract: A system, method and device for error detection/estimation in OFDM communications systems is proposed. The disclosed mechanism allows an efficient error prediction in a received packet, without having to perform full FEC decoding of the packet that could impair the overall latency of the system due to the time spent in a complete FEC decoding of the packet. In order to do that, it generates a decision variable with the aim to check whether a received packet has errors or not, after performing only partial FEC decoding of the packet, without either resorting to the use of error-detection codes.

公开(公告)号：US09923703B2

公开(公告)日：2018-03-20

申请号：US15051042

申请日：2016-02-23

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04J3/00 ,  H04L5/00 ,  H04W16/24 ,  H04L1/00 ,  H04J11/00 ,  H04L25/03 ,  H04J13/00 ,  H04L27/26 ,  H04W84/04 ,  H04W92/20

CPC classification number: H04L5/0073 ,  H04J11/0023 ,  H04J11/005 ,  H04J13/0003 ,  H04L1/0071 ,  H04L5/0007 ,  H04L5/0019 ,  H04L5/005 ,  H04L25/03866 ,  H04L27/26 ,  H04L27/2634 ,  H04W16/24 ,  H04W84/042 ,  H04W92/20

Abstract: A system and method for reducing interferences in OFDM networks comprising generating (31) a set of pseudo-random coordination patterns {kin; i=0, . . . , N−1; n=0, . . . , M−1}, wherein kin are integers from 0 to M−1, M is the number of calls in a coordination cluster, N is the number of subcarriers, n is a cell identifier within the coordination cluster, and kin≠kim∀n≠m, i=0, . . . , N−1; generating a randomizing pattern common to all cells within the coordination cluster, comprising an invertible transformation in the time domain of the complex symbols for each subcarrier; spreading (32) the complex symbols over M TTIs: b ⁡ [ i , m ] = M ⁢ ∑ m = 0 T - 1 ⁢ ⁢ a ⁡ [ i , n ] ⁢ exp ⁡ [ - j2π ⁡ ( Mn + k i ) · m / ( M · T ) ] . wherein a[i,n] denotes the symbols prior to the spreading (32), b[i,m] denotes the symbols after the spreading (32), 0≤ki≤M−1, i=0, . . . , N−1, m=0, . . . , T·M−1; scrambling (34) the spread symbols b[i,m] to all the cells within the coordination cluster; and mapping (35) the scrambled symbols over all the N subcarriers in the frequency domain and M consecutive TTis in the time domain.

公开(公告)号：US09780915B2

公开(公告)日：2017-10-03

申请号：US14872217

申请日：2015-10-01

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04W4/00 ,  H04L1/00 ,  H04L5/00 ,  H04W72/04 ,  H04L27/26

CPC classification number: H04L1/0048 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2607 ,  H04W72/0453

Abstract: A system and method are provided for reducing the overhead caused by the presence of the cyclic prefix while enabling inter-carrier interference (ICI) and inter-symbol interference (ISI) cancellation in an Orthogonal Frequency Division Multiplexing (OFDM) network that includes an OFDM transmitter and an OFDM receiver.

公开(公告)号：US09742524B2

公开(公告)日：2017-08-22

申请号：US14709873

申请日：2015-05-12

Applicant: TELEFONICA, S.A.

Inventor： Javier Lorca Hernando

IPC: H04L1/00 ,  H04L5/00 ,  H04L27/20

CPC classification number: H04L1/0003 ,  H04L1/0009 ,  H04L1/0013 ,  H04L1/0025 ,  H04L1/0029 ,  H04L1/0041 ,  H04L5/0007 ,  H04L5/0044 ,  H04L5/0046 ,  H04L27/20

Abstract: The method comprising: applying, by a transmitter, a Forward Error Correction to an information block to be sent to a receiver and modulating said information block prior to its transmission, wherein the transmitter has knowledge of a channel frequency response seen by the receiver and the applying and modulating are performed at a variable-rate, at the transmitter side, by: transforming the information block into a number of smaller packets denoted as codeblocks fitting the input sizes accepted by the Forward Error Correction; selecting, a set of modulation and coding schemes to be independently applied to each of the codeblocks; including, information about the selected set of modulation and coding schemes within part of physical resources devoted to user data by reserving specific subcarriers and OFDM symbols; and mapping, said information within physical resources devoted to user data and not reserved for said selected set of modulation and coding schemes, first in order of ascending OFDM symbols and then of ascending subcarriers.

公开(公告)号：US20160269165A1

公开(公告)日：2016-09-15

申请号：US15051042

申请日：2016-02-23

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04L5/00 ,  H04L25/03 ,  H04J11/00 ,  H04W16/24 ,  H04L1/00

CPC classification number: H04L5/0073 ,  H04J11/0023 ,  H04J11/005 ,  H04J13/0003 ,  H04L1/0071 ,  H04L5/0007 ,  H04L5/0019 ,  H04L5/005 ,  H04L25/03866 ,  H04L27/26 ,  H04L27/2634 ,  H04W16/24 ,  H04W84/042 ,  H04W92/20

Abstract: A system and method for reducing interferences in OFDM networks comprising generating (31) a set of pseudo-random coordination patterns {kin; i=0, . . . , N−1; n=0, . . . , M−1}, wherein kin are integers from 0 to M−1, M is the number of calls in a coordination cluster, N is the number of subcarriers, n is a cell identifier within the coordination cluster, and kin≠kim∀n≠m, i=0, . . . , N−1; generating a randomizing pattern common to all cells within the coordination cluster, comprising an invertible transformation in the time domain of the complex symbols for each subcarrier; spreading (32) the complex symbols over M TTIs: b  [ i , m ] = M  ∑ m = 0 T - 1   a  [ i , n ]  exp  [ - j2π  ( Mn + k i ) · m / ( M · T ) ] . wherein a[i,n] denotes the symbols prior to the spreading (32), b[i,m] denotes the symbols after the spreading (32), 0≦k1≦M−1, i=0, . . . , N−1, m=0, . . . , T·M−1; scrambling (34) the spread symbols b[i,m] to all the cells within the coordination cluster; and mapping (35) the scrambled symbols over all the N subcarriers in the frequency domain and M consecutive TTis in the time domain.

公开(公告)号：US10153874B2

公开(公告)日：2018-12-11

申请号：US15334680

申请日：2016-10-26

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04L5/00 ,  H04W72/12 ,  H04L5/14

Abstract: Method to perform joint scheduling in the downlink or in the uplink of a centralized OFDM radio access network for a plurality of users considering time, frequency and space domains, scheduler device thereof and computer program products. The method to be applied in the downlink or in the uplink of a centralized radio access network based on OFDM, whereby a set of remote radio heads of a set of remote units are connected to a central unit, that performs all (or part of) the radio-related processing tasks, wherein the scheduling exploit CoMP, NOMA and RF conditions and resource blanking techniques.

公开(公告)号：US20180138963A1

公开(公告)日：2018-05-17

申请号：US15810588

申请日：2017-11-13

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04B7/08 ,  H04L5/00 ,  H04B7/0413 ,  H04B7/0408

CPC classification number: H04B7/086 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0452 ,  H04B7/08 ,  H04L5/001 ,  H04L27/2657 ,  H04L27/2684

Abstract: A system, method and device to overcome the effects of mobility in OFDM wireless cellular networks. Individual beams are isolated and Doppler impairments are compensated so the constituent beams can reach the users in DL with ideally no Doppler impairments. Similarly in UL the signals corresponding to the different spatial beams are detected and their Doppler impairments compensated.

公开(公告)号：US09781714B2

公开(公告)日：2017-10-03

申请号：US14871075

申请日：2015-09-30

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04W72/04 ,  H04L5/00 ,  H04B7/0413 ,  H04L1/00 ,  H04L1/22 ,  H04B17/345 ,  H04J11/00 ,  H04L27/26

CPC classification number: H04W72/042 ,  H04B7/0413 ,  H04B17/345 ,  H04J11/005 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/22 ,  H04L5/0023 ,  H04L27/2613

Abstract: A system and method are provided for assisting user devices in performing OFDMA downlink interference cancellation, in which an interfering base station transmits a downlink signal in a first slot and a second slot, both slots including cell reference signals (CRSs) for physical channel estimation, the CRS of the second slot is modified to indicate encoded values of parameters characterizing the physical channel according to an encoding procedure, the slots are received by a served user device that detects the physical channel parameters carried by dedicated control signalling and encodes them by the encoding procedure, an unchanged CRS is reconstructed, and the slots are received by an interfered user device obtaining the encoded values and comparing to parameter patterns indicating absence of modifications in the CRSs, wherein if the encoded values are different from the patterns, the interfered user device decodes them to perform interference cancellation of the downlink signal.

公开(公告)号：US09742535B2

公开(公告)日：2017-08-22

申请号：US14579304

申请日：2014-12-22

Applicant: Telefonica, S.A.

Inventor： Javier Lorca Hernando

IPC: H04L5/00 ,  H04L25/03 ,  H04J11/00

CPC classification number: H04L5/0048 ,  H04J11/00 ,  H04L5/0005 ,  H04L5/0007 ,  H04L25/03006 ,  H04L25/03866

Abstract: A method for performing virtualization of a radio access technology (RAT) over Orthogonal Frequency-Division Multiple Access (OFDMA) wireless networks is provided. The method includes splitting OFDMA time-frequency resources into non-overlapping regions including a virtualization region including a part of a spectrum and the OFDMA symbols that are reserved for virtualization of the RAT; reserving resource elements of the OFDMA time-frequency resources in the virtualization region, for insertion of downlink reference signals including complex sequences known by a receiver to perform downlink channel estimation with a specified separation between signals in time and frequency domains; inserting training or pilot signals along the OFDMA time-frequency resources of the virtualization region; and mapping complex baseband symbols corresponding to information from the RAT into the OFDMA time-frequency resources of the virtualization region.

公开(公告)号：US09693326B2

公开(公告)日：2017-06-27

申请号：US14436655

申请日：2013-10-04

Applicant: TELEFONICA, S.A.

Inventor： Javier Lorca Hernando

IPC: H04W56/00 ,  H04J11/00 ,  H04L5/00

CPC classification number: H04W56/0015 ,  H04J11/0073 ,  H04J11/0076 ,  H04J2011/0096 ,  H04L5/0007 ,  H04W56/0035

Abstract: The method comprising at least one phase synchronized cellular base station having at least one transmit antenna for transmitting a signal to a at least one non-phase synchronized cellular base station, where it comprises transmitting by said at least one transmit antenna of said phased-synchronized cellular base station a beacon signal to said at least one non-phase synchronized cellular base station, included as part of said transmitted signal, said beacon signal comprising two orthogonal length-8 Walsh-Hadamard sequences to be broadcasted by said at least one phase synchronized cellular base station in order to provide said phase synchronization.