201 5 Maciej Krasicki Poznan University of Technology Slide 1 Author Packet Appending for BICMID Outline A glance at Bit interleaved Coded Modulation with ID: 715181
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Slide1
Date: 2015-11-10
November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 1
Author:
Packet Appending for BICM-IDSlide2
OutlineA glance at Bit-
interleaved Coded Modulation with Iterative
Decoding (BICM-ID)Proposed transmission scheme
Simulation resultsSummary
November 2015
Maciej Krasicki (Poznan University of Technology)Slide
2Slide3
BICM is a promising techniquefor
systems transmitting over fading channel.
November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 3
Complex
signals
represent
amplitude
and
phase
of real
passband
signals
.
BICM
t
ransmitter model
channel
encoderSlide4
November 2015Maciej Krasicki (Poznan University of Technology
)Slide 4
Transmitter
Receiver
channel
encoder
SISO
decoderSlide5
BICM-ID (BICM With Iterative Decoding)
November 2015Maciej Krasicki (
Poznan University of Technology)Slide 5
BICM-ID
iteration
1
channel
encoder
SISO
decoderSlide6
Error-Free Feedback (EF) StateNovember
2015Maciej Krasicki (Poznan University of Technology
)Slide 6
BICM-ID
iteration
1
SISO
decoderSlide7
need for a labeling map that assigns bit labels
differing in one position from each
other to possibly far constellation points (to maximize
avg. pairwise
distance)November 2015
Maciej Krasicki (Poznan University of Technology)
Slide
7
Error-Free Feedback (EF) StateSlide8
Gray labeling– the worst
choiceNovember 2015
Maciej Krasicki (Poznan University of Technology)
Slide 8
can’t
benefit much
from
iterative
decoding
Slide9
M16a– the optimal
oneNovember 2015
Maciej Krasicki (Poznan University of Technology)
Slide 9
avg
.
pairwise
distance
maximized
Slide10
November 2015Maciej Krasicki (Poznan University of Technology
)Slide 10
Packet Appending for BICM-ID –
assumptionsAppend regular packet of Gray-labeled signals
by some additional signals mapped according to a labeling map suitable for iterative decoding purposesAdjust the number of additional signals w.r.t. the current channel stateLegacy receiver should be able to understand the regular packet
Use high constrained-length codeUse higher order modulation to avoid higher time consumptionSlide11
PA-BICM-ID transmitterNovember 2015
Maciej Krasicki (Poznan University of Technology)
Slide 11
labeling
map
good for iterative decoding purposes
by Huang &
RitceySlide12
PA-BICM-ID receiverNovember 2015
Maciej Krasicki (Poznan University of Technology)
Slide 12Slide13
Modulation doping referenceNovember 2015
Maciej Krasicki (Poznan University of Technology)
Slide 13
Some symbols transmitted only according to
a
non-Gray labeling map
Flexibility
, but
only
moderate
performance
gain
over
reference
(Gray
labeling
)
. . .
. . .
(non-Gray
labeling
)Slide14
Simulation setupEach data frame
consists of 10 000 data bytesPseudo-random interleaver64-QAM PA-BICM-ID
compared with 16-QAM BICMTwo retransmission ratio values:
For statistical
accuracy, simulation runs until 100 erroneous
frames have been encountered
November
201
5
Maciej Krasicki
(
Poznan University of Technology
)
Slide
14
Retransmission
ratio
(
= K/P
) Max. spectral
efficiency (bpcu)2/3
21/22.25Slide15
Simulation results (1)November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 15Slide16
Simulation results (2)November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 16Slide17
SummaryPA-BICM-ID introduces the benefits of iterative decoding to systems not originally intended for this purposeFine
‟tuning” to the current propagation conditionsNo multidimensional constellation = no exponential growth in the
demapper routineThe whole legacy packet transmitted explicitly – the old devices can still hear and decode itSuitable for future multi-casting scenarios
November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 17Slide18
Straw pollDo you find PA-BICM-ID a
promising technique for future WLAN applications?
November 2015
Maciej Krasicki (Poznan University of Technology)
Slide 18