公开(公告)号：US20220149518A1

公开(公告)日：2022-05-12

申请号：US17310496

申请日：2019-02-12

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Shahriar SHAHRAMIAN ,  Rosanah MURUGESU

IPC: H01Q3/26

Abstract: A method and system are provided for aligning signals in a phased array system having multiple tiles. Tile-to-tile signal alignment is achieved through the use of internally-generated local oscillator signals and existing coupling paths between transmit and receive antenna elements in adjacent tiles of the phased array system. The relative phases of the local oscillator signals are measured in both directions between adjacent tiles to determine phase differences that can then be used for alignment of the signals between the adjacent tiles. The self-alignment process can then be repeated on subsequent adjacent tile pairs, thus providing a fully aligned and phase-balanced phased array system. Because there is no need for any external signals or components that are not already resident on the tiles, self-alignment can be performed as part of system startup, e.g., to align the multi-tile phased array before the system is placed into operation in a live network.

公开(公告)号：US20190052311A1

公开(公告)日：2019-02-14

申请号：US15671292

申请日：2017-08-08

Applicant: Nokia Solutions and Networks OY

Inventor： Rosanah MURUGESU ,  Hungkei CHOW ,  Werner COOMANS

IPC: H04B3/23 ,  H04B3/21 ,  H04L5/14 ,  H04L25/03

Abstract: In an example embodiment, a full duplex transceiver includes an analog-to-digital converter (ADC), at least one processor, a first digital-to-analog converter (DAC) and an amplifier. The ADC is configured to convert an analog first signal to a digital first signal, the analog first signal being based on a transmitted signal from the transceiver and a received signal from a far-end transceiver. The at least one processor is configured to determine pre-distortion compensation coefficients using the digital first signal and a first input signal and generate a pre-distorted compensated input signal based on the pre-distortion compensation coefficients. The first DAC is configured to convert the pre-distortion compensated input signal to an analog input signal. The amplifier is configured to amplify the analog input signal to a subsequent transmit signal.