Mobile communication speed record: One gigabit per second over the air

Dec 07, 2004

A world record was set at the research laboratories of the Siemens Communications Group. For the first time, data were transferred in real time via mobile communication at a speed of one gigabit per second (Gbit/s). By comparison: WLAN networks presently offer the fastest wireless links to mobile devices at speeds of around 50 MBit/s . In order to achieve its record-setting high speed, Siemens combined an "intelligent antenna system" consisting of three transmitting and four receiving antennas with Orthogonal Frequency Division Multiplexing (OFDM) . Researchers consider these technologies, which are especially efficient at using the frequently band, to be highly promising modules for the mobile communication generation beyond W-CDMA.

By the time the next generation of mobile communication debuts, which is expected to occur beginning in the year 2015, the need for transmission capacities for voice, data, image and multimedia is conservatively anticipated to rise by a factor of 10. “Future mobile communication systems will have to utilize the frequency band as efficiently as possible, with the lowest possible transmit power,” said Christoph Caselitz, the President of the Mobile Networks Division at Siemens Communications . “With our experimental system, we’ve been able to demonstrate how powerful intelligent antennas can be in combination with OFDM. In doing so, we’ve created a major module for future mobile communication systems.”

Professionals term intelligent antenna systems “multiple-antenna systems” or “MIMO” (Multiple Input, Multiple Output) systems. Under this concept, multiple antennas simultaneously transmit different flows of data over one and the same radio channel and frequency band. This is comparable to a room in which multiple clusters of people are simultaneously conducting conversations both within each cluster and between clusters, yet without interfering with one another. In contrast to conventional individual antennas, which each transmit on a separate frequency, the MIMO method enables data rates to be multiplied by making significantly more efficient use of the costly frequency band resource.

One of the reasons why multiple-antenna systems are not typically used today is the very high computing power that is required at the receiving end. This is because the information that is transmitted simultaneously by multiple antennas is received by multiple receiving antennas and has to be reconstructed in realtime for the receiving device. This exceeds the capabilities of the typical chips that are currently being employed in the mobile communication industry. The researchers at Siemens overcame this challenge by developing new and optimizing signal processing algorithms that can be efficiently implemented on the hardware modules that are available today.

The experimental system operates in the 5-GHz band and has a bandwidth of 100 MHz. The Orthogonal Frequency Division Multiplexing (OFDM) transmission method that it employs protects the signals against most types of interference, such as the echoes that are produced when the signals reflect off buildings. This method, which has long been known and is considered to be a highly promising transmission technology for future mobile communication, is already being employed today in Wireless LAN as well as in digital television (DVB) and radio (DAB).

The Siemens research team is already working on further increasing the data rate and enhancing the mobility of devices equipped with multiple antennas.

Siemens developed the experimental one-gigabit transmission system, which will premiere to the general public at the 3GSM World Congress 2005 in Cannes , in collaboration with the Fraunhofer Institute for Telecommunications (Heinrich Hertz Institute) and the Institute for Applied Radio System Technology .

Siemens Communications is one of the largest players in the global telecommunications industry. Siemens is the only provider in the market that offers its customers a full-line portfolio, from end-user devices to complex network infrastructures for enterprises and carriers as well as related services. Siemens Communications is the world’s innovation leader in convergent technologies, products and services for wireless, fixed and enterprise networks. It is the largest Siemens group and operates in more than 160 countries around the world. In fiscal 2004 (September 30), its 60,000-strong workforce posted sales of approximately 18 billion euros.

Explore further: Study: Apple's new iPhones score big in durability

add to favorites email to friend print save as pdf

Related Stories

Moving towards a more robust, secure and agile Internet

May 13, 2014

Today, the National Science Foundation's (NSF) Directorate for Computer and Information Science and Engineering (CISE) awarded $15 million to support three, multi-institutional projects that will further ...

Crucial, long-overdue BlackBerry makeover arrives

Jan 28, 2013

The maker of the BlackBerry smartphone is promising a speedier device, a superb typing experience and the ability to keep work and personal identities separate on the same phone. It's the fruit of a crucial, ...

A look at BlackBerry maker Research in Motion

Jul 10, 2012

On Tuesday, BlackBerry maker Research in Motion Ltd. held its shareholders meeting during which it asked disgruntled investors for patience as it develops new devices to rival the iPhone and Android smartphones. ...

A look at BlackBerry maker Research in Motion (Update)

Jun 28, 2012

On Thursday, BlackBerry maker Research In Motion Ltd. offered details on layoffs and announced yet another delay in its BlackBerry 10 devices. It also reported disappointing earnings for the latest quarter.

Recommended for you

Oculus unveils new prototype VR headset

Sep 20, 2014

Oculus has unveiled a new prototype of its virtual reality headset. However, the VR company still isn't ready to release a consumer edition.

Wireless sensor transmits tumor pressure

Sep 20, 2014

The interstitial pressure inside a tumor is often remarkably high compared to normal tissues and is thought to impede the delivery of chemotherapeutic agents as well as decrease the effectiveness of radiation ...

Tim Cook puts personal touch on iPhone 6 launch

Sep 20, 2014

Apple chief Tim Cook personally kicked off sales of the iPhone 6, joining in "selfies" and shaking hands with customers Friday outside the company's store near his Silicon Valley home.

User comments : 0