We are living in the midst of the information age. Along side the explosion
in information, comes our desire to be able to access it at any time, in any
place. Wi-Fi solutions are highly appealing since the do not require cumbersome,
wired infrastructure and enjoy the wide availability off-the-shelf 802.11 Wi-Fi
clients. However, there are a number of key challenges that need to be met in
order to create a truly effective outdoor and metro Wi-Fi solution:
- Metro Wi-Fi base stations currently use a single radio for the access, and
simple antenna diversity. This is a technology that suffers from short range,
limited capacity, and is adversely affected by multipath. The result is dense
access point deployment and costly infrastructure in addition to a low service
quality network plagued by spotty coverage.
- Outdoors metro Wi-Fi environments present much tougher electromagnetic
challenges than indoors environment, including much higher levels of
interference, much higher multipath delay-spread, and much faster moving objects
and users such as cars. Current access points are typically based on
commoditized semiconductors designed for indoor environments, which are not able
to effectively handle the physical dynamics of outdoor environments.
- Based on multiple antennas and radio transceivers with custom-designed
application-specific integrated circuits (ASICs) and embedded software.
- Optimized for outdoor metro Wi-Fi networks without requiring any changes to
standard Wi-Fi clients.
The result is the best performance in terms of throughput, range, indoor
penetration and interference mitigation, which ensures that service providers
are able to offer cost effective, top quality service. Service providers can
save on capital and operating expenses, accelerating return on investment and
making metro and rural wireless services affordable for a broad range of
municipalities and enterprises.
- Superior coverage
- Increased capacity
- Improved indoor penetration
- Interference immunity
The coverage area provided by WavionĄ¯s
technology is up to three times that of conventional Wi-Fi Access Points. The
superior range and uniform coverage means that the network can be scaled to
reach a larger group of users, which in turn yields higher subscriber revenues
at lower costs
Wavion's technology provides users with a powerful, high quality signal that is
not dependent on line-of-sight positioning, and is highly resistant to
interference. This results in a much improved uniform coverage with far fewer
dead spots, which allows the operator to provide high-quality service to all the
customers in the area.
The spatially adaptive technology improves the
link budget, which significantly increases the throughput to Wi-Fi clients. The
technology also minimizes the "fading phenomena" where Wi-Fi clients experience
rate drops from time to time. This provides further improvement to the effective
capacity of the infrastructure.
This capacity increase, allows the operator
to offer higher grade of service to clients, as well as increasing the number of
clients that can be served per base station.
Indoor penetration is very susceptible
to multipath and signal reflection. Since WavionĄ¯s spatially adaptive
beamforming technology increase the bi-directional link budget and exploits
multipath to its advantage, it has a superior ability to penetrate buildings and
walls compared to any conventional access points. This enables network operators
to offer access in residences, places business and schools. In addition, deeper
indoor penetration makes self-install service a reality by reducing the need for
separate outdoor CPEs.
WavionĄ¯s technology has
incorporated advanced mechanisms for interference handling. ItĄ¯s beamforming
technology which concentrates the antenna beam only on the client as well as its
Dynamic Interference Handling (DIH) capability, allows operation in severe
interference conditions. This minimizes the effect that interference may have on
the performance in terms of capacity and coverage.
WavionĄ¯s spatially adaptive beamforming
technology is based on multiple radios and antennas, and leverages the multiple
signals received and transmitted by them. These multiple signals are properly
adjusted by the beamformer to maximize the signal strength at the client modem
and the base station modem. This is achieved by assuring that the signals
transmitted in each of the multiple antennas sum up into one coherent signal at
the client antenna, and similarly assuring that the each of the multiple signals
received from the client sum up into one coherent signal at the base station
WavionĄ¯s spatially adaptive beamforming
technology exploits multipath signals resulting from reflections in the
propagation path and turns them into an advantage by coherently combining all
multipath signals. This is in contrast to standard Wi-Fi access points which
suffer severe degradation as a result of multipath. This ability improves the
radio performance in Non-Line-of-Sight conditions and provides more uniform
coverage with fewer dead spots.
WavionĄ¯s beamforming technology
improves the gain of the wireless link by about 10dB. This significantly
increases the range, throughput and penetration in both Line-of-Sight and
Non-Line-of-Sight conditions. The improvement in range and throughput, resulting
from the beamforming gain and multi antenna diversity, are presented in the
diagram, where Wavion's beamforming performance is compared to a conventional
access point in typical Non-Line-of-Sight propagation model. WavionĄ¯s
beamforming doubles the range and provides much higher rates at given
WavionĄ¯s beamforming 10 dB link gain and its ability to exploit
multipath rather than suffer from it provides deeper penetration of walls and
buildings and improved uniformity of the coverage in the 2.4 GHz range, when
working with internal CPEs.
Beamforming provides more resilience to
interference due to its inherent directivity. On receive, the beamformer focuses
on the user location, thereby reducing the level interference coming from other
locations. Similarly, on transmit the beamformer focuses on the user location,
thereby reducing the level of interference transmitted to other locations. This
ability is critical in large deployments where there is a need to minimize
Division Multiple Access (SDMA)
SDMA enables simultaneous
downlink communications with multiple users over the same frequency channel,
thus increasing significantly the network capacity.
Wavion's unique SDMA
technology creates two downlinks to two different users simultaneously,
transmitting one data stream per user. Each stream is "beamed" by means of
beamforming in such a way that the user receives only the stream directed to
him, while the other steams are received below the noise level. This doubles the
networkĄ¯s downlink capacity.
improvement in capacity and range resulting from SDMA and spatially adaptive
beamforming are presented in the diagram. Wavion's SDMA performance is compared
to a conventional Wi-Fi Base Station in typical Non-Line-of-Sight propagation
model. Note that, WavionĄ¯s SDMA technology capacity increase tapers off
gradually as the radius from the base station increases. This is a result of the
division of power between the two beams.
WavionĄ¯s SDMA capability will be
offered as a SW upgrade to all WavionĄ¯s base stations. Network operators are
able to upgrade their existing network in order to increase their capacity and
improve their networks value.