[opendtv] Re: Casio, Fujitsu Make Phone Digital TV Receiver Chip-Nikkei

The article quoted below says:

"A conventional OFDM demodulation chip analyzes
signal frequency and strength to compensate for
signal loss. The new chip also analyzes data
along the time axis, correcting the waveform as
the receiver passes through the shadows of
buildings or moves closer to or farther from
broadcast antennas."

All tuners incorporate some amount of
equalization, including COFDM tuners, but that's
not all they use to compensate for signal loss.
All digital tuners also have convolutional and
block forward error correction decoders, which
certainly "analyze data along the time axis."

Maybe what they're describing is that this new
tuner feeds the correction from these FEC decoders
back to a decision feedback equalizer, which
would be pretty cool. Along the lines of what we
discussed in the last couple of weeks (soft
decoders for both RS and trellis codes, where the
type of signal distortion being experienced is
used to better optimize the FEC algorithms).

All in search of approaching the Shannon limit.

"The circuitry also has a function to adjust the
tuner to pick up the optimal signal when signals
reflect off buildings, and a supplementary
antenna that controls the directionality of the
primary antenna for reception of a stronger
signal."

This must be describing a diversity tuner or an
electronically steered antenna?

Bert


---------------------------
Casio, Fujitsu Make Phone Digital TV Receiver Chip-Nikkei

November 30, 2004 12:00am
Source: Nihon Keizai Shimbun America, Inc.

  Nikkei English News: TOKYO (Nikkei)--Casio
Computer Co. (6952.TO) and Fujitsu Ltd. (6702.TO)
have jointly developed a high-performance OFDM
(orthogonal frequency division multiplexing)
demodulation chip for reception of terrestrial
digital broadcasts by cellular phones, the Nikkei
Business Daily reported in its Tuesday edition.

The new signal reception chip is more than 100
times as sensitive as devices made to date,
enabling even people on speeding trains to
receive and watch digital television broadcasts
on their phone screens.

Digital TV broadcasting for phones is expected to
become available in the first quarter of 2006, so
Casio and Fujitsu aim to have a commercial
product ready in time for this.

The plan is to make the new chip available first
to Casio Hitachi Mobile Communications Co. and
possibly to other handset makers later on.

A conventional OFDM demodulation chip analyzes
signal frequency and strength to compensate for
signal loss. The new chip also analyzes data
along the time axis, correcting the waveform as
the receiver passes through the shadows of
buildings or moves closer to or farther from
broadcast antennas. The circuitry also has a
function to adjust the tuner to pick up the
optimal signal when signals reflect off
buildings, and a supplementary antenna that
controls the directionality of the primary
antenna for reception of a stronger signal.

Casio designed the chip incorporating these three
extra features, and Fujitsu added memory and
peripheral circuitry to obtain a single-chip
solution.

<<Nikkei English News -- 11/29/04>>
<< Copyright =3DA92004 Nihon Keizai Shimbun America, Inc. >>
 
 
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