Nortel MIMO Technology Provides Up to Double the Existing Access Network Capacity to Serve More Customers at Less Cost
Tuesday October 24, 9:00 am ET
OTTAWA, Oct. 24 /PRNewswire-FirstCall/ - Nortel(x) (NYSE/TSX: NT) has conducted the industry's first wireless transmission using Uplink Collaborative MIMO to demonstrate the ability for operators to serve up to double the number of mobile broadband subscribers supported in a cell site as current wireless technologies allow.
For 4G wireless operators, this enables the potential to substantially increase their subscription revenue with the same capital investment. Developed by Nortel, Collaborative MIMO is part of the WiMAX industry standard and is also being proposed for 3GPP WCDMA Long-Term Evolution (LTE) and 3GPP2 CDMA EV-DO Rev-C standards.
"Uplink Collaborative MIMO creates a technological disruption that offers revolutionary improvement in wireless network capacity and provides a clear path to 4G Mobile Broadband - of which WiMAX is the first technology," said John Hoadley, chief technology officer, Mobility and Converged Core Networks, Nortel.
"Nortel's latest demonstration confirms that subscriber count and capacity gains of OFDM-MIMO can be delivered even where individual devices are not MIMO-enabled with multiple transmit antennas. Collaborative MIMO provides the greater uplink capacity and spectral efficiency needed by operators to deliver a full mobile broadband experience which will include internet, video and VoIP cost-effectively across a wide range of devices," he said.
The demonstration at Nortel's Advanced Wireless Lab in Ottawa, used Multiple-Input, Multiple-Output (MIMO), an emerging wireless antenna technology that will serve as the foundation of Nortel's 4G Mobile Broadband solutions.
For the demonstration, Nortel used MIMO-enabled multiple antennas at the cell site and on 4G devices together with orthogonal frequency division multiplexing (OFDM) transmission technology. Previous Nortel and industry research has shown that a combination of these two technologies offers the ability to deliver the highest network bandwidth and greatest spectral efficiency capabilities at the lowest cost.
With OFDM, a single channel within a spectrum band is divided into multiple, smaller sub-carriers that transmit information simultaneously without interference. MIMO allows multiple data streams to be transmitted at the same time and on the same sub-carriers through interference-free MIMO spatial channels. Due to unique spatial channels that result for each antenna path, interference between data streams is reduced. As a result, OFDM-MIMO substantially increases the bandwidth and spectral efficiency.
Uplink Collaborative MIMO is a further enhancement that enables the use of the same channel sub-carriers by multiple devices and subscribers - effectively allowing them to share the same sub-carrier without interference. Without Collaborative MIMO, the traffic being carried on a single sub-carrier would not be maximized across multiple subscribers. The result would be that the traffic would be severely limited, preventing users from having a true broadband experience and limiting VoIP capacity such that conversations would be unintelligible.
In March 2005, Nortel was the first company to demonstrate OFDM-MIMO at 37 Mbps peak data rates in 5 MHz of spectrum in the downlink, with the transfer of a 128 MB file in just 30 seconds. Over the last eight years, Nortel has been making progressive investments in OFDM-MIMO technology and owns dozens of critical patents in these areas.
About Nortel
Nortel is a recognized leader in delivering communications capabilities that enhance the human experience, ignite and power global commerce, and secure and protect the world's most critical information. Our next-generation technologies, for both service providers and enterprises, span access and core networks, support multimedia and business-critical applications, and help eliminate today's barriers to efficiency, speed and performance by simplifying networks and connecting people with information. Nortel does business in more than 150 countries. For more information, visit Nortel on the Web at www.nortel.com. For the latest Nortel news, visit www.nortel.com/news.
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