Showing posts with label Mitsubishi. Show all posts
Showing posts with label Mitsubishi. Show all posts

Wednesday, January 9, 2019

Mitsubishi Electric develops Ultra-Wideband GaN amp for base stations

Mitsubishi Electric introduced the first ultra-wideband digitally controlled gallium nitride (GaN) amplifier.

The new device, which is compatible with a range of sub-6GHz bands focused on 5G mobile communication systems, offers a power efficiency rating of above 40%. The company says the amplifier will reduce the power consumption of mobile base stations.

Key features:

  • Mitsubishi Electric’s novel ultra-wideband digitally controlled GaN amplifier uses an advanced load modulation circuit with two parallel GaN transistors. The circuit expands the bandwidth of load modulation, a key factor for the amplifier’s high-efficiency operation, for wideband (1.4–4.8GHz) operation. The wide-band operation of amplifier supports several frequency bands.
  • Digitally controlled input signals for amplifier realize high-efficiency load modulation of above 40% over 110% of the fractional bandwidth.

Sunday, January 28, 2018

Mitsubishi Electric develops autonomous for smart appliances

Mitsubishi Electric Corporation has developed an autonomous platform that enables networked smart appliances without the need for cloud computing or internet connection.

The platform, which leverages a lightweight software library that requires memory space of just around three megabytes and which can be run even on low-spec microcontrollers, is expected to facilitate a wide variety of cooperative smart appliances and related services.  Mitsubishi is aiming for commercialization of the platform by 2020. Several patents are pending.

Monday, May 22, 2017

Mitsubishi Electric and Nokia Bell Labs develop GaN amplifier

Mitsubishi Electric, Nokia Bell Labs and the Center for Wireless Communications at UC San Diego have announced the joint development of what is claimed as the first ultra-fast gallium nitride (GaN) envelope-tracking power amplifier, offering support for modulation bandwidth up to 80 MHz and designed to reduce power consumption in next-generation wireless base stations.

To companies explained that to address demand for greater wireless capacity, mobile technologies are adopting systems that use complex modulated signals with high peak-to-average power ratio (PAPR) and extra-wide modulation bandwidth. This requires power amplifiers to often operate at backed-off power levels below their saturation levels, while power amplifiers are typically efficient near to their saturation power level and not at backed off levels, as with 4G LTE signals (>6 dB PAPR).

As a result, envelope-tracking power amplifiers have been evaluated as a means to enhance power-amplifier efficiency, although to date the supply-modulator circuit has proved a bottleneck limiting modulation bandwidth for advanced wireless communications, such as LTE-Advanced.

The newly-developed ultra-fast GaN envelope-tracking power amplifier delivers high performance leveraging Mitsubishi Electric's high-frequency GaN transistor technology and its design for the GaN supply-modulator circuit. Utilising Nokia Bell Labs' real-time digital pre-distortion (DPD) system, the power amplifier has demonstrated efficient operation, including with 80 MHz modulated LTE signals.

The partners claim that this represents the widest modulation bandwidth achieved for this application to date, and is around four times higher than signals used in other envelope-tracking power amplifiers. In addition, the technology delivers a drain efficiency of 41.6% in this wide-bandwidth operation, helping to reduce base-station energy consumption as well as increase wireless communication speed and capacity.

Additionally, the Nokia Bell Labs' real-time DPD system enables pre-distortion for wideband signals to correct the output signal from the power amplifier, resulting in an adjacent channel leakage ratio (ACLR) of -45 dBc for LTE 80 MHz signals, which is compatible with wireless communication standards.

Specifications of the GaN envelope-tracking power amplifier include: support for carrier frequency of 0.9 to 2.15 GHz; output power of 30.0-30.7 dBm; drain efficiency of 36.5-41.6%; ACLR of -45 dBc; and modulation signal of 80 MHz LTE Advanced with 6.5 dB PAPR.

The University of California, San Diego, is a leading university for mixed-signal, microwave and mmWave RFICs, digital communications, applied electromagnetics, RF MEMS and nano-electronics research and hosts the Center for Wireless Communications (CWC), is a university-industry partnership that includes Mitsubishi Electric and Nokia.

Friday, May 20, 2016

Mitsubishi Upgrades IMEWE Submarine Cable for 100G

Mitsubishi Electric is upgrading the India-Middle East-Western Europe (IMEWE) Cable System for 100G line rates, thereby increasing the overall capacity of the system to 5.6Tbps.

The upgrade, which will involve installing submarine line terminal equipment (SLTE) and terrestrial line terminal equipment (TLTE) in eight countries, is expected to be completed by the second quarter of 2016.

The cable system comprises three optical fiber pairs with two fiber pairs on an express path, plus a terrestrial link connecting the cities of Alexandria and Suez in Egypt.

Mitsubishi Updates India-Middle East-Western Europe Cable

 Mitsubishi has upgraded the India-Middle East-Western Europe (IMEWE) Cable Network with its 40 Gbps DWDM.  The upgrade involved installation of submarine line terminal equipment in eight countries.

The IMEWE Cable System spans 12,091 kilometers with 10 terminal stations owned by a consortium of nine leading telecom carriers in eight countries: India, Pakistan, UAE, Saudi Arabia, Egypt, Lebanon, Italy and France.

The nine IMEWE parties which have contracted for the upgrade and are co-owners of IMEWE system are Bharti Airtel Ltd., Emirates Telecommunications Corporation, France Telecom, OGERO Telecom, Pakistan Telecommunications Company Limited, Saudi Telecom Company, TATA Communications Limited, Telecom Egypt, and Telecom Italia SPARKLE S.p.A.

Monday, February 15, 2016

Mitsubishi Electric Develops 1Tbps Multi-subcarrier Optical Transceiver

Mitsubishi Electric Corporation has developed a multi-carrier optical transceiver capable of one Terabit per second (1 Tbps) rates -- a 10-fold improvement over current mainstream commercial transceivers, which operate at up to 100 Gbs) per optical receiver.

Mitsubishi Electric said it achieved the 1Tbps transmission rate with existing optical fibers by using a multi-subcarrier technology that transmits 11 light waves (subcarriers) simultaneously in a single channel by using an optical comb, a device that creates a series of discrete, synchronized optical waves equally and densely spaced in the channel. While conventional methods would require 11 receivers for the same number of subcarriers, this new technology only requires a single receiver due to the use of densely spaced, synchronized subcarriers in a single channel and novel multi-subcarrier signal processing algorithms. No major changes are required to the existing optical network infrastructure, keeping the cost of deploying this new technology quite low.

Usually, when using subcarriers for optical communication, each subcarrier undergoes different signal distortions, which results in damaged data like video distortion on the receiving end. To avoid this problem, Mitsubishi Electric used pilot signals to accurately realign the subcarriers at the receiver. Known pilot symbols are periodically inserted into the transmitted signal, which serves as a landmark for correct orientation of all subcarriers and prevents data damage.

The experiment also achieved a spectral efficiency of 9.2b/s/Hz, which as of January 2016, was the highest in the world in a 1Tbps transmission using a single optical receiver.

Tuesday, January 26, 2016

Mitsubishi Electric Develops an Antenna using Seawater Plume

Mitsubishi Electric has developed an innovative antenna system, called SeaAerial, that shoots a column of seawater into the air to create a conductive plume for the transmission and reception of radio-frequency waves.

The system, which is thought to be the first seawater antenna, is capable of receiving digital terrestrial broadcasts for normal viewing. The company said it is investigating conductive and transmutative liquids as new materials for antennas.

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