Telefonica, S.a.

Javier Lorca Hernando

Elena Serna Santiago

Quiliano Perez Tarrero

Juan Francisco Esteban Rivas

Monica Marti Molina

Jorge Navarro Ortiz

Pablo Ameigeiras Gutierrez

Juan Manuel Lopez Soler

Carlos González Sánchez

Raquel Garcia Perez

Mónica MartÍ Molina

Pablo Ameigeiras GUTIÉRREZ

Raquel Garcia PÉREZ

Quiliano PÉREZ Tarrero

Juan Manuel LÓPEZ Soler

A method and system for optimizing the performance of spatial multiplexing techniques in MU-MIMO wireless systems comprising subsectors where the presence of significant correlation between antenna elements can impair the performance of MU-MIMO techniques. The proposed solution ensures optimum selection of a specific combination of transmit antenna elements and receive antenna elements that maximizes MU-MIMO performance.

Method and system for optimal spatial multiplexing in multi-antenna wireless communications systems using MU-MIMO techniques

Method and system to dynamically associate spatial layers to beams in a FWA network operating in the millimeter-wave frequency range. A base station and a CPE are willing to wirelessly transmit and receive data through a wireless channel of the FWA network, the base station having beamforming capabilities henceforth generating multiple wireless beams. The base station performs all baseband wireless functions related for creating, keeping and managing the connections between the base station and the CPE at baseband level, wherein information is handled in the form of up to M spatial layer signals, and with no built-in capabilities for creation, detection or management of the beams. The base station also performs all necessary RF functions at millimeter-wave frequencies, including beamforming and conversion from complex baseband signals to RF signals and vice versa, and also couples the RF signals to the wireless channel.

Method and a system for dynamic association of spatial layers to beams in millimeter-wave fixed wireless access networks

A method and transmitter for generating broadcast beam patterns in massive MIMO systems, the transmitter comprising a rectangular antenna array with a number Nof antenna elements in the horizontal direction and a number Nof antenna elements in the vertical direction. The MIMO transmitter generates broadcast beam patterns with determined beam widths in horizontal and vertical dimensions to cover a sector area of a cell by the rectangular antenna array radiating N&#xd7;Nradiofrequency signals at a carrier frequency, the sector area being where a user equipment requests from the MIMO transmitter access to the cell. The beam widths in horizontal and vertical directions are determined by using an optimum set of complex excitation coefficients calculated from a discretized continuous-space array factor &#x3c8;(&#x3b8;,&#x3c6;), which is based on a discretization over the elevation angle &#x3b8; and the azimuth angle &#x3c6; of the antenna elements.

Method and device for generating broadcast beams in massive MIMO systems

A method to provide robustness against noise and interference in wireless communications, a transmitter and computer program products, involving sending to a receiver (), through a wireless channel (), information using a constant-envelope waveform with complex baseband representation of the form s[n]=Aexp{j&#x3d5;[n]}. The phase &#x3d5;[n] following the expression and the wireless channel has an Additive White Gaussian Noise component and flat-fading conditions, wherein the transmitter () calculates a FFT length, N, and a number of active positive subcarriers, N, needed in order to have a given improvement in the signal to noise ratio at the active positive subcarriers of the instantaneous frequency spectrum containing the information; calculates a cutoff subcarrier kneeded to overcome Doppler, phase noise and carrier frequency offset impairments at the receiver side, and generates a complex baseband signal waveform of the form s[n]=Aexp{j&#x3d5;[n]} carrying information with the FFT length, number of active positive subcarriers and cutoff subcarrier.

Method to provide increased robustness against noise and interference in wireless communications, a transmitter and computer program products thereof

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.

Method, system and device for compensation of Doppler impairments in OFDM wireless communication networks

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.

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

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.

Method, system and device for error detection in OFDM wireless communication networks without full forward error correction decoding

A method to generate a wireless waveform for use in a wireless communication system, a wireless communication system and computer program product thereof The method comprises the generation of a waveform for application in the wireless communication system characterized by significant phase noise, Doppler spread, multipath, frequency instability, and/or low power efficiency by at the transmitter side: creating a discrete-time instantaneous frequency signal {tilde over (f)}[n]; appending a cyclic prefix with length Lto the beginning of the discrete-time instantaneous frequency signal {tilde over (f)}[n]; constructing a discrete-time unwrapped instantaneous phase &#x3c6;[n]; constructing a discrete-time complex baseband signal, and appending at the beginning a Constant Amplitude Zero Autocorrelation, CAZAC, signal of length Lfor multipath detection; and passing the constructed discrete-time complex baseband signal through a digital-to-analog, DAC, converter to yield the continuous-time radio frequency signal s(t) after conversion to the carrier frequency.

Method to generate a wireless waveform for use in a wireless communication system, a wireless communication system and computer program products thereof

A system and method for reducing interferences in OFDM networks comprising wherein a[i,n] denotes the symbols prior to the spreading (), b[i,m] denotes the symbols after the spreading (), 0&#x2264;k&#x2264;M&#x2212;1, i=0, . . . , N&#x2212;1, m=0, . . . , T&#xb7;M&#x2212;1;

Method, system and devices for reducing interferences in OFDMA wireless communication networks

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 data block (e.g. a packet) without using error detection codes that may impair spectral efficiency (due to the overhead) especially when very small size packets are used. In order to do that, it generates a decision variable with the aim to check whether a received block has errors or not, without resorting to the use of error-detection codes.

Method, system and device for error detection in OFDM wireless communication networks

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.

Method and system for assisting user devices in performing interference cancellation in OFDMA wireless communication networks

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.

Method and system of cyclic prefix overhead reduction for enabling cancellation of inter-symbol and inter-carrier interferences in OFDM wireless communication networks

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.

Method and a system for performing virtualization of a radio access technology over orthogonal frequency-division multiple access (OFDMA) wireless networks and computer program products thereof

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.

Method and transmitter for channel coding and modulation in the frequency domain of orthogonal frequency-division multiplexing wireless networks

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.

Growing community of inventors

Madrid, Spain

Javier Lorca Hernando