 Techniques for Coverage and Capacity Enhancement
For almost
all broadband wireless systems, increased data throughput and
increased range equates to improved user satisfaction, greater
economic advantage or both. There are numerous techniques
that can lead to such an advantage without needing to simply
increase the size and power of the power amplifier.
Two such
options of interest are adaptive antenna systems (AAS) and
optimised Forward Error Correction (FEC) techniques.
Through
the development of advanced antenna arrays, broadband wireless
systems have been shown to demonstrate improved performance
in both throughput and range. These and similar techniques
have been used by Cambridge Consultants in low-cost radar
systems for many years. Now these techniques are being applied
to wireless communications standards. One technique
involves electronic beam steering, where energy can be electronically
focused spatially. Another involves implementation of
what has been called MIMO (Multiple Input, Multiple Output
systems), where specific channel characteristics can be exploited
to achieve gain by the use of multiple transmit and receive
antennas.
Cambridge
Consultants’ signal processing experience from
the last decade puts it in a very strong position to exploit
these emerging techniques. Should you be interested in
enhancing the performance of your wireless links, we can help
you to apply this technology.
Since their discovery in 1993, turbo codes have become famous
for their near-optimum performance over noisy channels.
Recent increases in DSP power have enabled the use of turbo
codes in applications like 3G, DVB and WiMax.
Cambridge Consultants has developed TurboDesigner to facilitate
the design of high performance, high efficiency turbo decoder
hardware and software.
The performance
of ‘perfect’ turbo decoders is well
understood – where they are simulated in workstations with
high numerical precision and almost unlimited memory. However,
real-world implementations that must decode in real-time using
limited resources are much less well understood. Questions
soon arise like:
- Where can numerical approximations be made safely?
- How much memory is required?
- What is the best way to exploit parallelism?
- How can the design be verified?
- Is Turbo coding really appropriate for the application?
Cambridge
Consultants has developed its TurboDesigner application to
answer these questions and more. From the system architecture
phase right through to verification, it provides the designer
with rapid simulations and data analysis tools.
- A host of turbo encoding
and decoding options
- Easy to use MATLAB7 graphical front
end
- Highly efficient C-compiled libraries
for high-speed simulation
- Generation and analysis of test vectors
for HDL simulations
- Support
for Cambridge Consultants’ FEC
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