Zte (USA) Inc.

Zte Corporation

Aviat U.s., Inc.

Thanh Hung Nguyen

Ying Shen

Andrey Kochetkov

Aleksandr Semenyshev

Shawn Walsh

Edwin John Nealis

William Schmid

Zhiping Feng

Hong Hu

Zhuo Li

Dong Hong Yom

A method for biasing a power amplifier using a transmission signal having a time-varying envelope is provided. The method comprises producing a time-varying signal indicative of an amplitude of the envelope of the transmission signal and comparing the time-varying signal to a plurality of distinct threshold voltages. The method further comprises, for each of the plurality of distinct threshold voltages exceeded by the time-varying signal, providing a respective bias voltage to a respective input of a summing device and producing, using the summing device, an output bias voltage that is at least a sum of the respective bias voltages provided to the respective inputs of the summing device. The method further comprises biasing the power amplifier with the output bias voltage and amplifying the transmission signal using the power amplifier biased at the output bias voltage.

Multi-level digital adaptive PA bias for microwave radios

A digital microwave radio system includes a splitter that splits a common baseband input into two baseband outputs, first and second transmitters, each transmitter electrically connected to a baseband output of the splitter via a mixer, a common local oscillator electrically connected to the mixer of the first transmitter and the mixer of the second transmitter via an adjustable phase shifter, respectively, and a combiner. The common local oscillator is configured to up-convert each baseband output into a radio-frequency signal using a corresponding mixer. The combiner combines the two radio-frequency signals into a 0-degree phase-shift output and a 180-degree phase-shift output, respectively. A phase error control loop adjusts the phase shifter to minimize the 180-degree phase-shift radio-frequency output. A combiner gain control loop adjusts the output power level of the two transmitters in accordance with an actual power detector reading at the 0-degree phase-shift radio-frequency output.

Efficient output power combining digital microwave radio system

An antenna coupling device is disclosed. The device includes a first isolator that includes an input port and an output port and a first circulator that includes a first port, a second port, and a third port. The first port of the first circulator is coupled with the output port of the first isolator; and the second port of the first circulator is configured for coupling with a first antenna. The device also includes a second isolator that includes an input port and an output port. The input port of the second isolator is coupled with the third port of the first circulator.

Two-transmitter two-receiver antenna coupling unit for microwave digital radios

Outdoor coupler unit for multi-channel trunking microwave digital radios

A system and method for protecting a received data stream. Active receivers and standby receivers are provided, each adaptable to receive a data stream on a traffic channel. Plural data processing units are operatively in communication with the receivers. At least one of the plural DPUs provides a switching signal to the receivers to switch the state of the active receiver to standby and the state of the standby receiver to active as a function of a quality measurement of the received data stream via the traffic channel.

Distributed protection switching architecture for point-to-point microwave radio systems

A method for performing digital predistortion to a microwave radio transceiver in response to an increase/decrease of transmit power level is disclosed. If the new transmit power level is higher than the current transmit power level, a set of digital predistortion (DPD) coefficients is applied to the transceiver before the issuance of a transmit power level increase command to the transceiver. Otherwise, a transmit power level decrease command is issued to the transceiver before the application of the set of DPD coefficients to the transceiver. Determining the set of DPD coefficients for the transceiver involves two stages: (i) calibrating the transceiver at a room temperature under predefined conditions and generating a DPD lookup table including DPD coefficients at a plurality of predefined temperatures other than the room temperature and (ii) determining the set of DPD coefficients for a given set of operating conditions using entries in the DPD lookup table.

Dynamic digital predistortion for a microwave radio system

A microwave radio receiver includes a first down-converter, a second down-converter, and a combined receiver signal level (RSL) and interference detector. The first down-converter is configured to convert a RF signal into a first IF signal. The second down-converter is configured to convert the first IF signal into a second IF signal. The combined RSL and interference detector is configured to determine one or more RSLs and generate an interference indicator based on the first IF signal from the first down-converter and a control signal from the second down-converter.

Receiver architecture for dual receiver signal level and interference detection in microwave digital radio applications

A method of providing multiple voltage references to a radio-frequency device using a single analog line includes the steps of setting the analog line voltage level to be a first reference voltage signal; instructing a first voltage reference device to memorize the first reference voltage signal by sending a first digital control signal to a digital line; providing the first reference voltage signal to the RF device via the first voltage reference device; re-setting the analog line voltage level to be a second reference voltage signal; instructing a second voltage reference device to memorize the second reference voltage signal by sending a second digital control signal to the digital line, the second digital control signal being different from the first digital control signal; and providing the second reference voltage signal to the RF device via the second voltage reference device.

Method of providing multiple voltage references to a radio-frequency device using a single analog line

A transceiver used in a radio unit for wireless communication, comprises: a circuitry board including a transmitter and a receiver; a first connector on a first side of the circuitry board, wherein the first connector is configured to be connected to an interface card; a second connector on a second side of the circuitry board, wherein the second side is opposite the first side and the second connector is configured to be connected to a digital card via a flexible circuit; and a pair of transmit port and receive port located on the second side of the circuitry board, wherein the transmit port is coupled to the transmitter and the receive port coupled to the receiver, respectively. When the transceiver is part of a split-mount radio unit (SRU), the first connector is connected to the interface card and the second connector is not in use. When the transceiver is part of an all-outdoor radio unit (AOU), the second connector is connected to the digital card and the first connector is not in use.

Flexible unified architecture for point-to-point digital microwave radios

System and method for implementing a link aggregation system, a protection system, and an XPIC application for an all outdoor radios system using a wireless channel operating at a license-free 60 GHz band are provided. The license-free 60 GHz band offers a wide frequency bandwidth that can support a high speed data rate up to 10 Gbps in full duplex mode, frequency reuse, and high security due to its fast oxygen absorption at 60 GHz. As such, a wireless channel operating at the license-free 60 GHz band may be used for a link aggregation system to support wireless local area network (LAN) connections with the speed up to 7 Gbps. In addition, a wireless connection operating at the license-free 60 GHz band may be used to support both XPIC application and protection system for all outdoor radios to achieve a transmission speed of up to 10 Gbps in a full duplex mode.

Link aggregation system, protection system, and cross polarization interference cancellation applications for all outdoor radios using wireless channels operating at a licensing-free 60 GHz band

An outdoor radio communication system housed in a single enclosure comprises a first transceiver, a second transceiver, a communication interface unit, an RF in-phase transmit combiner, an antenna coupling unit and a receive filter. The first transceiver includes a first receiver and a first transmitter. The second transceiver includes a second receiver and a second transmitter. The two transceivers are communicatively coupled with the communication interface unit. The RF in-phase transmit combiner, communicatively coupled to the first transmitter and the second transmitter, receives a phase-aligned RF signal from each transmitter, to create a third RF signal with enhanced signal gain. The two phase-aligned RF signals originate from the same source in the communication interface unit. The antenna coupling unit is communicatively coupled to the RF in-phase transmit combiner and the first receiver, and the receive filter is communicatively coupled to the second receiver.

Compact dual all-outdoor point-to-point microwave radio architecture

A system includes a control board, a controlled board, and a connector connecting the control board to the controlled board. The control board includes a processing unit that configures the reference voltage signals, a non-volatile memory that stores information about the reference voltage signals, and a DAC that outputs the reference voltage signals in accordance with instructions from the processing unit. The controlled board includes: first and second voltage reference devices that receive first and second reference voltage signals, respectively, and a radio-frequency device that receives a first frequency signal and a second frequency signal and outputs a third frequency signal based on one of the first and second reference voltage signals. The connector includes an analog line for providing reference voltage signals to the first and second voltage reference devices and a digital line for providing control signals to activate one of the first and second voltage reference devices.

Growing community of inventors

Cary, NC, United States of America

Thanh Hung Nguyen