A method for implementing controller area network (CAN) communications between a plurality of CAN nodes using a single radio frequency (RF) coax cable is provided. In an aspect, a hardware interface (e.g., an electronic circuit) may be coupled to each of the plurality of CAN nodes. The hardware interface may receive a CAN signal from a first CAN node. The hardware interface may convert the CAN signal to a single RF signal and transmit the RF signal to a second CAN node over the single RF coax cable. Moreover, the hardware interface may transmit a CAN feedback signal received over the RF coax cable to the first CAN node. In an aspect, the hardware interface may include an amplitude modulation (AM) modulator, an AM detector, and a bandpass filter.

Disclosed herein are systems, methods, and non-transitory computer-readable storage media for a modified MAC protocol which can facilitate communications with both full-duplex and half-duplex devices. A system configured according to the disclosed method can enable communications between an Access Point (AP) and a client in either full duplex or half duplex. The system can similarly enable peer-to-peer communications in both full duplex and half duplex communication modes.

Techniques for multiband radio frequency (RF) signal communications using integrated multiple-input multiple-output (MIMO) multiband bandpass filter bank based on concentric dielectric ring resonators are described. The integrated MIMO multiband bandpass filter bank includes a plurality of transmission line structures for transmitting and receiving radio frequency (RF) signals, and a plurality of ring resonators with different sizes and different resonant frequencies electromagnetically coupled to the plurality of transmission line structures, wherein each ring resonator of the plurality of concentric ring resonators is configured as a single-band bandpass filter to allow a bandpass signal to pass through. By the use of integrated MIMO multiband bandpass filter bank, multiple desired bandpass signals corresponding to the multiple resonant frequencies of the multiple dielectric ring resonators can operate to transmit and receive in the processing of multiband RF signals while having out-of-band spurious emission and interference rejection.

A method, apparatus, and computer program for scanning for a secondary cell are provided. According to an embodiment, an apparatus operates in a primary cell of a cellular communication system, wherein the primary cell includes a primary component carrier associated with a bandwidth. The apparatus synchronizes scanning for a candidate secondary cell to radio transmissions in the primary cell, the secondary cell including a secondary component carrier expanding bandwidth beyond the bandwidth of the primary cell.

A signal interface unit in a radio system includes an external device interface configured to receive a downlink asynchronous radio carrier signal for a radio frequency carrier from an external device; a clock conversion unit communicatively coupled to the external device interface and configured to re-clock the downlink asynchronous radio carrier signal to a master clock of the radio system from the clock of the external device; and an antenna side interface configured to communicate at least one of the re-clocked downlink asynchronous radio carrier signal and a downlink digitized radio frequency signal based on the re-clocked downlink asynchronous radio carrier signal to an antenna unit.

A user equipment, a base station, and data transmission methods thereof are provided. The user equipment is connected to a first base station and receives a first FDR configuration of the first base station and a second FDR configuration of the second base station. The user equipment establishes an RRC connection with the second base station. The user equipment performs data transmission with the first base station and establishes a data connection with the second base station on the same frequency band simultaneously according to the first and second FDR configurations. The user equipment performs data transmission with the first base station and performs data transmission with the second base station on the same frequency band simultaneously according to the first and second FDR configurations.

System and method indicating delays added to packets due to retransmission events. The method includes the steps of receiving multiple packet streams and multiplexing them into a first multiplexed packet stream; storing in memory the first multiplexed packet stream together with time indications; receiving a retransmission request and selecting data for retransmission; multiplexing the first multiplexed packet stream and the data for retransmission into a second multiplexed packet stream; utilizing the time indications for calculating delays that were added to packets of the second multiplexed packet stream as a result of fulfilling the retransmission request; adding the calculated delays to at least some of the packets of the second multiplexed packet stream; and transmitting the second multiplexed packet stream.

A cross-division duplex (XDD) system includes an apparatus having a transceiver configured to communicate via an uplink channel and a downlink channel concurrently. The apparatus also includes a transmit antenna, a receive antenna, and a processor. The processor is configured to: estimate a non-linear component corresponding to a transmit path in the transceiver; apply an equalizer function to a received signal; and subtract, in a self-interference cancel (SIC) circuitry, the estimated non-linear component from the equalized signal.

Embodiments of a four-port isolation module are presented herein. In an embodiment, the isolation module includes a step-up autotransformer comprising a first and second winding that are electrically coupled in series at a center node. The first port of the isolation module is configured to couple an antenna to a first end node of the series coupled windings. The second port of the isolation module is configured to couple a balancing network to a second end node of the series coupled windings. The third port is configured to couple a transmit path to the center node. The fourth port is configured to couple a differential receive path across the first end node and the second end node. The isolation module effectively isolates the third port from the fourth port to prevent strong outbound signals received at the third port from saturating an LNA coupled to the fourth port.

A terminal is disclosed that includes a receiver that performs, using a first time interval or a second time interval, a receiving process for downlink control information indicating a transmission direction per given time interval and a processor that determines the transmission direction based on the downlink control information. In other aspects, a radio communication method is also disclosed.