As nearly all of mobilegudgets become broadband-connected, they are starting to generate communications traffic and putting pressure on communications capacities and bandwidths. The move to cloud computing is also causing an increase in large-volume, long-distance and intercontinental data communications.
NEC Central Research Laboratories is developing wireless transmission technology that applies a multi-element antenna to enable wireless base stations to operate in diverse environments. This, combined with a highly efficient wireless resource management method, will provide access to a reliable and stress-free connection environment for anyone, anytime.
NEC Central Research Laboratories is conducting research into a digital wireless transmission system that uses metamaterial adaptive technology with the aim of providing stable communications in every possible environment. This research has led to the successful miniaturization of base stations and devices while continuing to maintain a high wireless performance.
Wireless modules that deploy metamaterials to improve communications performance and achieve antenna miniaturization
As MIMO (multiple-input and multiple output)—a communications method that enables the simultaneous use of a combination of multiple antennas—becomes more widespread, wireless communications are increasing in speed. At the same time, however, the increase in the number of antennas attached to wireless devices is becoming an obstacle to miniaturization.
NEC has realized an original miniaturized antenna called the "μSR antenna" to resolve the antenna size problem.
This miniature antenna adopts as its antenna element a split ring resonator that has a type of man-made "metamaterial" as one of its component elements. By using a multi-layer structure in the split ring resonator, it is possible to maintain sufficient radio wave emissions, while realizing one of the world's smallest antenna elements. In addition, by optimizing the shape of the resonator, variation in antenna performance is suppressed when the antenna is integrated in devices, and radio wave emissions with all-direction sensitivity are realized.
This world-smallest class, high-performance antenna has been adopted in the IEEE802.11ac compliant wireless router made by NEC Access Technica, and is contributing to the miniaturization of NEC products. Please see here for more details.
Digital wireless transmission system that combines ultra-low power and flexible frequency response
NEC Central Research Laboratories has developed a digital wireless transmission system for wireless base stations used by telecom carriers that realizes a reduction of 30%1 compared with the conventional system while also realizing a flexible frequency response over a wide frequency range.
This system realizes ultra-low power consumption as well as miniaturization using the high efficiency signal modulation method amplifier (amp) that NEC has developed. The new system achieves miniaturization of up to 50%2 compared with conventional wireless base stations by reducing the casing needed for the base station heat sink.
This technology improves the convenience of wireless communications by enabling high-speed data downloads and video streaming by users even in crowded locations and places where radio wave reception has been traditionally difficult, and enables telecom carriers to install, at low cost and in large numbers, base stations able to respond with the optimal frequency for the wireless environment. See the press release for details.
1: Comparison with conventional NEC analog wireless transmission system.
2: Comparison with conventional NEC wireless base station device.
Electromagnetic environment sensing system
NEC Central Research Laboratories has developed an electromagnetic environment sensing system to measure and visualize actual radio wave usage in real time, thereby enabling the effective use of radio waves covering many different situations, such as dynamically allotting wireless frequencies to IoT devices, or temporarily allotting them to critical communications devices in the event of a disaster. This system is comprised of a radio wave sensor that extracts from a wide range of frequencies used by various wireless systems only the frequency or direction of the radio wave to be measured and performs highly sensitive measurement of that radio wave, and software that comprehensively visualizes in real time the radio wave situation of the area to be measured, by estimating and interpolating the radio wave situation between radio wave sensors. See the press release for details.