Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Ab

Elettronica S.p.a.

Paolo Ghelfi

Antonella Bogoni

Antonio D'Errico

Marzio Puleri

Filippo Scotti

Francesco Laghezza

Giovanni Serafino

Luca Poti

Teresa Pepe

Filippo Ponzini

Patryk Urban

Mirco Scaffardi

Vito Sorianello

Claudio Porzi

Daniel Onori

Sergio Pinna

Marco Bartocci

Antonio Tafuto

Alessandro Albertoni

Raffaella Mazzoli

Maurizio Gemma

Transmitting and receiving apparatuses, transmitting and receiving methods, and a transceiver for a phased array antenna are provided. The transmitting apparatus may comprise a laser light source configured to provide an optical beam comprising one or more spectral components. The transmitting apparatus may comprise a modulator configured to modulate the optical beam with a signal to be transmitted. The transmitting apparatus may comprise one or more group delay controlling units configured to add one or more controllable time delays to the one or more spectral components. Further, the transmitting apparatus may comprise a plurality of waveguides each having a chromatic dispersion configured to guide the optical beam, wherein the laser light source is tunable to control time delays added by the plurality of waveguides.

Transmitting and receiving apparatuses and methods for a phased array antenna

A receiver () for a phased array antenna comprises a laser light source () arranged to provide an optical spectrum comprising a first spectral component having a first wavelength and a second spectral component having a second wavelength. The first wavelength is spaced from the second wavelength. A wavelength separator () is configured to separate the first spectral component from the second spectral component, such that the first spectral component is directed onto a first path (A) and the second spectral component is directed onto a second path (B). A first delay unit () is configured to add a controllable time delay to the first spectral component on the first path. A second delay unit () is configured to add the time delay to the second spectral component on the second path. A modulator () is configured to modulate the first spectral component on the first path with a received RF signal from the phased array antenna. A heterodyning device () is configured to heterodyne the resulting first and second spectral components.

Receiver for a phased array antenna

A signal generator for a phased array antenna comprises a laser light source arranged to provide an optical spectrum comprising a plurality of spaced wavelengths. The signal generator further comprises a dispersion unit arranged to introduce a delay to a plurality of spectral components of the optical spectrum associated with the spaced wavelengths. The delay is dependent on the wavelength of the spectral components of the optical spectrum. The signal generator further comprises a heterodyning device configured to generate a signal for the phased array antenna by heterodyning the spectral components associated with different ones of the spaced wavelengths of the laser light source.

Signal generator for a phased array antenna

A periodic phase modulation, having a period shorter than a symbol period, is applied as a source modulation, in addition to a symbol modulation, to signals transmitted between a transmitter and a receiver in a communication network. Symbol value elements can be sent from multiple transmitters () to a receiver () in the same symbol period can be processed on the basis of the source modulation without destructive interference. In some embodiments, the symbol value elements sent by different transmitters can be combined in the receiver. In some embodiments, symbol value elements sent by different transmitters can be distinguished in the receiver.

Multipoint transmission and reception in a radio communication network

An opto-electronic oscillator () comprising: an optical source () to generate an optical carrier signal having a carrier wavelength; an optical phase modulator () to apply a sinusoidal phase modulation to the optical carrier signal to generate two first order sidebands having a &#x3c0; phase difference between them; an optical phase shifter () comprising an optical resonator configured to apply a substantially &#x3c0; phase-shift to one of the first order sidebands at a preselected wavelength within an optical spectrum of said first order sideband; and a photodetector () configured to perform optical heterodyne detection of the optical carrier signal with both: said one of the first order sidebands substantially it phase shifted by the optical resonator; and the other of the first order sidebands, to generate an electrical carrier signal (), and wherein a first part of the electrical carrier signal () is delivered to an electrical output () and a second part of the electrical carrier signal () is delivered to the optical phase modulator as a drive signal.

Opto-electronic oscillator and method of generating an electrical carrier signal

A plurality of sub-cells are defined within a cell area of a radio communication network by the intersection of a radio paths of a plurality of directional radio antennas. The plurality of directional radio antennas are arranged to broadcast radio signals simultaneously, and to receive radio signals simultaneously. This disclosure relates to determining of signal values transmitted by or received from the plurality of directional radio antennas in a radio communication network.

A transceiver for a phased array antenna comprises a laser light source arranged to provide an optical spectrum comprising a plurality of spaced wavelengths. The transceiver further comprises a dispersion unit arranged to introduce a delay to a plurality of spectral components of the optical spectrum associated with the spaced wavelengths. The delay is dependent on the wavelength of the spectral components of the optical spectrum. The transceiver further comprises a first optical filter configured to select a plurality of spectral components received from the dispersion unit. The transceiver further comprises a first heterodyning device configured to generate a signal for transmission by the phased array antenna by heterodyning the selected spectral components associated with different ones of the spaced wavelengths of the laser light source. The transceiver is configured to receive signals from the phased array antenna. The transceiver further comprises a modulator configured to modulate spaced wavelengths from the said laser light source with the received signals. The spaced wavelengths are associated with the spectral components used to generate the signal for transmission. The transceiver further comprises a second heterodyning device configured to heterodyne spectral components associated with different ones of the spaced wavelengths of the laser light source.

Transceiver for a phased array antenna

An RF signal transceiver comprising a mode-locked laser to output an optical signal having a plurality of phase-locked modes, an optical splitter to power split the optical signal into a transmitter optical signal and a receiver optical signal; a transmitter apparatus to receive the transmitter optical signal and comprising an optical filter to select two of the modes, an optical modulator to modulate a part of the transmitter optical signal to form at least one phase modulated optical signal, and a photodetector to heterodyne the phase modulated optical signal with one of the modes without a corresponding phase modulation to form an RF signal for transmission; and a receiver apparatus arranged to receive an RF signal and the receiver optical signal and comprising an optical modulator to modulate the receiver optical signal with the received RF signal; and an optical to electrical signal conversion apparatus to convert the modulated receiver optical signal into a corresponding electrical signal.

Radio frequency signal transceiver, coherent radar receiver and method of processing radio frequency signals

A receiver scheme for optical signals in Return-to-zero (RZ) systems comprises a conventional receiver at the input of which is placed an all-optical decision element realized with nonlinear optical elements. This allows obtaining a substantial increase in performance compared with a simple conventional receiver optimized for NRZ signals. In particular, an optical decision is made up advantageously of two non-linear optical loop mirrors (NOLMs) arranged in cascade with an optical amplifier at the input and a pass-band filter at the output. The loops lengths may be different, as may be the splitting ratios of the couplers of the NOLMs.

Optical receiver scheme with all-optical decision element

An optical logic gate () comprises: first and second optical inputs () for receiving respective optical signals (A, B) and an optical output () for outputting an optical signal (P) which represents the result of applying a required logic function. The logic gate is characterized by optical combining means () for combining the optical signals to produce a corresponding combination signal whose power (P) is the combination of the powers (P, P) of the optical signals and non-linear optical means () for receiving the combination signal (P) and emitting the optical output signal (P) the logic function depending on the characteristic of the non-linear optical means wherein the characteristic is selected such that the power of the output signal is correlated to the power of the combination signal by the selected logic function.

Growing community of inventors

Pisa, Italy

Paolo Ghelfi