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Technology

The Challenge

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.

Wavion's solution

  • 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.


Advantages:

  • Superior coverage
  • Increased capacity
  • Improved indoor penetration
  • Interference immunity

Wavion technology advantages

Coverage
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.

Capacity
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
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.

Interference immunity
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.


 

 

Beamforming

Based on multiple radios and antennas

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 modem.

Exploits multipath propagation

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.


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Improved gain doubles the range

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 ranges.


Deeper indoor penetration

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.

Resilience to interference

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 inter-site interference

 


 

 

 

Space 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.

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Capacity Diagram

 

The 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.