Sumitomo Electric has served the wireless infrastructure market for over 30 years, delivering high quality products and leading technology, exemplified by outdoor traffic systems and PHS base stations in over 55,000 locations. Sumitomo Electric's wealth of experience and advanced expertise in this field serve as the foundations of the Advanced RRH products.
For delivering more bits per hertz per square mile, today’s, and more importantly tomorrow's, mobile networks are required
- To provide additional capacity on demand via multi carrier technology
- To have a variety of channel configurations for more flexible deployment
- To offer compatibility to advanced multi antenna techniques such as MIMO and Beamforming in 2x4, 4x4 or even 4x2 configurations
- To reduce OPEX associated with BTS deployments by
- reducing size and weight of tower devices
- ensuring the radio module efficiency of 25% with less power consumption
- utilizing smaller battery/generator power backup systems
Sumitomo Electric's Advanced RRHs lead the industry by offering the features addressed above. Our small, light-weight RRHs provide customers with excellent efficiency and flexibility based on the company’s unparalleled technology.
Gallium Nitride (GaN) amplifiers are expected to provide excellent efficiency and extensive frequency flexibility for future network building. Used in combination with Envelope Tracking technology, GaN amplifiers can offer a PA efficiency of 50% or more and a total RRH efficiency of over 30%. Sumitomo Electric has been working on the development of these technologies and succeeded in implementation for the first time in the world.
Sumitomo Electric has developed original Digital Pre-Distortion (DPD) technology for compensating the nonlinearity of the power amplifiers in a small footprint. The company also succeeded in applying the DPD technology to GaN/ET amplifiers and opened up the door for GaN/ET amplifiers to the mobile infrastructure market.
Crest Factor Reduction
Reduction of the Peak to Average Power Ratio (PAPR) is one of the challenges in 3G/4G mobile networking. The Crest Factor Reduction (CFR) technique is used to reduce the dynamic range of a transmitted signal so that the amplifier can be operated closer to the saturation point. Implementing this technique, Sumitomo Electric has effectively reduced the PAPR without affecting the EVM performance.
Advanced Antenna Support
Offering a wide range of configurations of 2x2, 2x4, 4x4 and 4x2, Sumitomo Electric’s RRH products support advanced multi-channel combining techniques such as MIMO and Beamforming. The RRH products offer additional hardware support for transmission calibration in the Beamforming process, allowing the users to establish a network of a large-volume and high-speed data transmission capacity.