Panasonic Corporation today announced that it has developed a new
wireless communication technology for M2M (Machine-to-Machine) sensor
networks, where devices communicate with each other in an
autonomous way without human intervention.
Prototype Module employing Developed Wireless Technologies (Photo: Business Wire)
This technology is based on a single chip of LSI that can simultaneously
detect multiple wireless communication standards, which differ from one
country to another or in the target applications. Multiple communication
modes are integrated by sharing the software of same functions and
reducing the amount of signal processing in microcomputer. As a result,
engineers can design and develop wireless modules that are small but can
operate for an extended period of time. The newly-developed technology
makes it easier to connect disparate devices and helps accelerate the
spread of wireless sensor networks, contributing to
achieving a society with a safe, secure, convenient and comfortable
Currently, different modes of wireless communication are used in
different countries and regions for connecting devices to sensor
networks. The new multi-mode wireless communication technology
integrates multiple receiver circuits required for each individual
wireless mode into a single one, enabling devices to be connected easily
and stably each other regardless of operation frequencies and wireless
standards. With a smaller area, the same as the receiving part of
conventional single-mode wireless chip, multi-mode wireless LSI can
support up to three different wireless modes at a time. The new LSI
helps create a small and power-saving wireless module that will continue
to operate for around 20 years on the battery.*2
Panasonic holds 26 Japanese patents and 19 overseas patents (including
pending) related to this technology.
Development of this technology was supported in part by the "Research
and Development for Expansion of Radio Spectrum Resources" program of
The Ministry of Internal Affairs and Communications, Japan. A field test
starts today at The ICT Incubation Laboratory in Research Center for
Advanced Science and Technology, the University of Tokyo.
More on the Technology
1. Multi-mode technology that reduces both power consumption and
memory capacity requirement based on frequency detection by hardware and
unified control by common software for multiple wireless operation modes.
In wireless sensor networks, FSK modulation is normally
used. Conventional FSK demodulators, such as Arctan demodulators,
detect the operation frequency by monitoring received signals in time
domain and then demodulate based on the detected frequency. In order to
receive multi-mode signals of different frequencies or based on
different standards, a receiver needs to eliminate noise in accordance
with bandwidth of each mode, thus a dedicated wireless LSI is required
for each wireless mode.
Panasonic developed technologies to detect all frequency components
simultaneously within multiple modes by employing Short-time DFT,
which can also determine the data rate with respect to each mode by
hardware and then demodulate by achieving an optimum control to the data
rate. In addition, instead of switching among multiple software control
modules each corresponding to one transfer rate, a unified software
module for all modes is newly implemented. These technologies enable a
single LSI to support multiple wireless modes.
2. Receiver power reducing technology that enables 20-year battery
operation while supporting multiple wireless modes, which is achieved by
intelligently controlling voltage supplies to minimize circuit current,
and by generating high rate internal clocks from low rate clocks.
In conventional wireless receivers, a constant voltage is used for every
circuit to guarantee a whole stable operation regardless of operation
frequencies or temperatures. However, to maintain such a constant
voltage a strong enough supply voltage has to be supplied all the time.
This causes waste when a lower power supply is sufficient.
Panasonic developed an intelligent power supply technology which
controls a voltage dynamically for a circuit according to its frequency,
temperature and process variations. The dynamic control minimizes
current consumption of a circuit. As an example, for the high frequency
oscillator circuit which consumes the most of current, it reduces by 70%
compared to our previous design.
Also a high SNR is required for an analog-to-digital
converter (ADC) to process received signals.
Conventionally this is realized by a high rate sampling circuit which
picks out pulses from a 100MHz clock. But such a circuit consumes much
Panasonic developed a technology to generate high rate sampling pulses
from a low rate clock by using its rising edge effectively. Furthermore,
Panasonic developed a SAR-ADC which can realize a high SNR
equivalent to that generated by a conventional ?S ADC, but
with lower power consumption. Compared to our previous design it has
been reduced by 60%.
3. Wireless LSI miniaturizing technology which reduces the size of
coils in oscillator circuits and eliminates filters used in
Conventional oscillator circuits require large coils to minimize the
increase of circuit current due to transistor performance variations.
The newly developed intelligent power supply control technology
compensates for the transistor variations and enables use of twice the
oscillation frequency. This makes a small-sized oscillator circuit to be
realized, which has a smaller coil and a divide-by-two circuit both with
low current consumption. In addition, instead of conventional
analog-to-digital converters of the ?S ADC that have been necessary to
achieve required performance, a SAR-ADC is adopted in the new technology
which makes a compact filter-less analog-to-digital converter possible.
Panasonic Corporation is a worldwide leader in the development and
engineering of electronic technologies and solutions for customers in
residential, non-residential, mobility and personal applications. Since
its founding in 1918, the company has expanded globally and now operates
over 500 consolidated companies worldwide, recording consolidated net
sales of 7.30 trillion yen for the year ended March 31, 2013. Committed
to pursuing new value through innovation across divisional lines, the
company strives to create a better life and a better world for its
customers. For more information about Panasonic, please visit the
company's website at http://panasonic.net/.
Photos/Multimedia Gallery Available: http://www.businesswire.com/multimedia/home/20140327006487/en/
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