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Technology
How Does
It Works
For years many
companies and users where facing problems with radio wave propagation with
conventional antennas especially where there are obstructions like trees,
building, hills and over water. Almost all of the antennas in the market
today did not resolve the issues of obstructions and the multi-path fading or
reflection effect. Most companies realized that their wireless access points
do not go more than 30m indoors or 100m outdoors. The PHItenna can handle up
to 1-5km radius per cell. This is due to the fact that the standard access
points default radio cannot handle multi path, fading and other noisy signals
very well. And recently, more technology has gone into semiconductor designs
to try to rectify these problems using complex radio signal processing
techniques like MIMO (Multiple In Multiple Out), Beam Forming or Spatial
Diversity. These techniques may work to some extend but they cost a lot to
implement and would render all existing 802.11 a/b/g solutions obsolete
because the users need to replace access points and CPE (Customer Premise
Equipment) client adapters to take advantage of the slightly longer range
solutions. PHItenna will also work with these new type of Access Points.
PHIwave’s innovative
PHIcell, PHItenna and PHIsig processor design has been able to provide the
benefits of these new types of digital signal processing (DSP) techniques
without making existing 802.11 b/g hardware client obselete. The PHItenna and
PHIsig subsystem set is like no other solution today. The key is that it
processes radio frequency RF electromagnetic wave in multi-dimensional and multi-vector
space. All the users have to do is to hook up their existing wireless LAN
access points directly from the AP to the PHItenna subsystem and it does the
rest. It also does not alter the digital modulation techniques used e.g. CCK,
frequency hopping FHSS, WCDMA, DSSS, OFDM, BPSK, QPSK, QAM etc. and therefore is compatible to
existing Wi-Fi solutions. It improves the way RF signals are propagated and
radiated through the air.
 Classical
ElectroMagnetic Theory of Radio Wave Propagation
This
is one the first true innovation in antenna technology in past 20
years. It will give up to at least 200%-300% (2X-3X) the performance of
conventional antennas. This is the answer to superior non line of sight
(NLOS) signal reception and transmission. A radio wave travels through the air about the size of a needle
pin. If your antenna is vertically polarized, the needle pin
stream of electrons must remain vertical, as sent. If the signal hits
an obstruction the signal will flip or rotate or bounce into multiple
positions or vectors as it gets to the receiving radio and be seen as
noise. In some cases, the receiving does not even receive the signals.
If one can capture that signal, you have a superior antenna that is not prone
to obstructions. Many antenna and wireless manufacturers strive to reject
signal that is not matched in polarization in order to reject noise.
The PHItenna, however embraces and gathers that signal that the others
reject. It is still good, just in a different polarization or
vector. The more it receives, the better the reception. This
antenna is made for the non-line of sight (NLOS) use and line of sight
(LOS). PHIwave offers an antenna subsystem that will give you better
data transfer with less packet drops and reduces the latency to 1/3 of
conventional solutions. E.g. Tested at 2-7ms ping time over 2.5km.
Our patent pending technology allows us to give lower ping time than
conventional solutions and thus maintain good signal link conditions.
In a PHIwave Networks solution, each platform supports backhaul
coverage in all directions using sectoral or omni antennas in a circular
array. The antennas have a good gain, superior NLOS handling and a pseudo
narrow horizontal beamwidth of 60 degrees, which together with enhanced radio
performance, provide significant reach extension. PHItenna has 2 main models
– sectorial or omni versions.
System availability is ensured through a combination of
techniques:
- The radio environment is
constantly changing and the radios adapt to these changes on a
packet-by-packet basis. In addition, dynamic power and data rate changes
on individual radio links compensate for radio effects such as multipath
reflection, fading and diffraction.
- Radio-aware routing algorithms
choose the best route for traffic based on available capacity,
latency and radio link performance.
- To increase system up-time
and minimize traffic outages, traffic from each broadband platform can
be load balanced across a minimum of two routes to reduce the impact of
link congestion and failure.
- Alternate paths are
continuously calculated and refreshed so that seamless re-routing of
traffic can occur with minimal packet loss in the unlikely event of a
link failure.
A PHIwave solution can easily scale to meet increased network
demand. New platforms can be incorporated into the network automatically,
without complex operator intervention or zero operator involvement.
A network can be deployed with a single PHIcell Mother Access
point (point of presence) in the early days, and as usage increases,
additional PHIcell Child Access points can be added for increased capacity
and redundancy through multi-homing and alternative routes. PHIcells multiple
radio technology and frequencies allow it to be dynamic, robust, smart and
high speed wireless network.
Diagram of PHIcell Wireless Mesh Networks interconnections
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