Transcript doc.: IEEE 802.15-03/169r0 March 2003 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: MDMA: The economic RF technology.

doc.: IEEE 802.15-03/169r0
March 2003
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: MDMA: The economic RF technology for the Wireless Age
Date Submitted: 11 March, 2003
Source: Manfred Koslar, Zbigniew Ianelli, Nanotron Technologies
Alt-Moabit 61, Berlin, 10555, Germany
Voice: +49 30 399 954-0, FAX: +49 30 399 954-288, E-Mail: [email protected]
Re: Discussion of possible PHY/MAC enhancement
Abstract: PHY enhancement
Purpose: Basis for discussion of the advantages of MDMA as an option to expand potential market
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for
discussion and is not binding on the contributing individual(s) or organization(s). The material in this
document is subject to change in form and content after further study. The contributor(s) reserve(s) the right
to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE
and may be made publicly available by P802.15.
Submission
Slide 1
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
The Principles and Benefits of MDMA
• Multi Dimensional Multiple Access
• New modulation method
• Can be wideband or ultra-wideband
Submission
Slide 2
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
THE CHANNEL UNRELIABILITY
PATH LOSSES
SU1
SHADOWING
SU5
MULTI PATH FADING
Flat fading
Frequency selective fading
Fast fading effects
SU4
BS
SU2
NOISE
DISTURBANCES
CHANNELS INTER ACTION
SU3
SU n
SYSTEMS INTERACTION
Submission
Slide 3
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
THE MODEL
ONLY FOR MODEL
P [W]
t
2
t
1
Submission
Slide 4
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
ECONOMICAL VERSUS
TECHNICAL ASPECTS
1. CONSTANT POWER VERSUS FREQUENCY
2. CONSTANT POWER VERSUS TIME
P [W]
3. BIT ENERGY EQUALLY SPREAD OVER
WHOLE BAND AND VARIABLE TIME
4. BIG BT PRODUCT IN THE CHANNEL
Submission
Slide 5
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
UNECONOMIC USE OF ENERGY
ER [Ws]
PT = const
TB = const
2
E B R ( 1/r ) [ Ws ]
EBR(r) = const .
NOISE [ Ws ]
10
Submission
20
30
Slide 6
40
r max
r [m ]
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
THE VARIATION OF THE
BIT ENERGY AND RATE
Solution No. 1: Variation of the bit duration
P = const
T
2
T (r) = E
B R
B
 r
  P
T
E (r) = const .
B R
10
Submission
20
30
Slide 7
40
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
THE ADAPTIVE BIT ENERGY
SU1
1
SU 4
4
SU5
5
BS
2
SU2
SU3
SU n
n
1
2
Submission
1
4 5 n
Slide 8
2 45
n
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
CONSTANT POWER VERSUS
FREQUENCY
Frequency domain
Time domain
U [V]
t [s]
U [V]
 << 1/B
t [s]
Solution No. 2: sync pulse shaping
U [V]
SINC Pulse
sin x
x
t [s]

Submission
 = 1/B
B/2
Slide 9
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
CONSTANT POWER VERSUS TIME
U [V]
sin x
x
fo
SINC Pulse
t [s]
B
Solution No. 3: Transformation of AM into FM via a dispersive delay line
U1 [V]
U2 [V]
sin x
x
LFM
Pulse
Chirp Pulse
t [s]
LFM
Pulse
t [s]
U2 [V]
U1 [V]
sin x
x
Chirp Pulse
t [s]
t [s]
Submission
Slide 10
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
THE DIFFERENT BT PRODUCTS
IN THE CHANNEL AND BASEBAND
B  T >> 1
t1
B = 1
t2

f1
Submission
f2
Slide 11
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
TIME AND FREQUENCY SPREADING
Solution No. 4: Different chirps in amplitude and in frequency spreading
Submission
Slide 12
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
DUAL SPREADING
[V]
UK( t)
8
1 Eb
1 
6
4
4 Eb
4
8 Eb
8
16 Eb
16 
A bstand k 
2
FREQUENCY
SPREADING
2 Eb
2 
0
-2
Uo
-4
2 Uo
2 Uo
2
2 Uo
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
t
4 Uo
-6
4.0
4.5
5.0
5.5
6.0 [µs]
[V ]
U C (t) 4
2
TIME
SPREADING
0
-2
t
-4
0
0 .5
1 .0
1 .5
S y m b o l ra te
2 .0
2 .5
3 .0
3 .5
S Y M BO L
[M B au d ]
4 .0
4 .5
5 .0
E N ER G Y
5 .5
6 .0 [ µs]
BER
1
1 00
90
80
RANGE
70
B E R fo r B P S K
60
BIT ENERGY & RATE
RANGE AND BER
S y m b ol ra te
50
40
30
20
10
1 010
10
10
10
10
10
10
10
0
0
Submission
0.5
1 .0
1 .5
2.0
2 .5
Slide 13
3 .0
3 .5
4 .0
4 .5
5 .0
5 .5
6 .0
2
4
6
8
10
12
14
16
- 18
t
[µs ]
Koslar, Ianelli, Nanotron Technologies
March 2003
doc.: IEEE 802.15-03/169r0
MULTI DIMENSIONAL ADAPTIVE
MATCHED FILTER SYSTEM
Spectral
efficiency
The symbols are transformed into sinc pulses (sin x/x), the shortest pulses possible at given bandwidth with a
duration time δ and a constant spectral power density  exploitation of the bandwidth  highest speed possible
 δ = 1/B.
BER
control
If the symbol distance Ts > δ frequency spreading ν is given by ν = Ts / δ = BTs. Independently time spreading ψ is
given by ψ = T/δ = BT. So the gain for both can be controlled independently from each other, for B is given,
means constant, but Ts and T can be varied. With both the S/N ratio can be controlled.
Flexibility
All operations are performed on the time axis: symbol rate (frequency spreading), sinc pulse generation and time
spreading with one exception to adjust the amplitude of the sinc pulses to determine the respective symbol energy.
So these principles are not restricted to but can be ideally combined with TDMA, where different time slot lengths
can be foreseen to organize the total system capacity.
Disturbances
Noise and disturbances are suppressed by the system gain and/or are spread by the dispersive delay line in the
receiver.
Multi path
Chirp signals by their constant spectral density are ideal for precise channel measurement combined with the
ability to improve the S/N despite channel limited power. This precision allows accurate compensation of multi
path effects.
Slide 14
Koslar, Ianelli, Nanotron Technologies
Submission
doc.: IEEE 802.15-03/169r0
March 2003
THE VERSATILE MULTI DIMENSIONAL
MODULATION MODES
Amplitude U ()
[Symbol Energy modulation]
0
Sinc Pulse
[Spectral Efficiency and small BT product ]
AM with center frequency 
                                                       
Sign of phase for MCP
Phase modulation
[Carrier]
[Modulation for Constructive Equalizing]
[ Modulation for information ]
Reversible
Transformation
Phase modulation
Sign of phase for MCP
FM
[Information ]
[Constructive Equalizing]
[Modulation for a big BT Product (matched filter system)]
Amplitude U () [For system gain and constant average power]
0
1
) Relations are valid for one single sinc and one single chirp pulse. Due to the superposition law a sequence
out of those pulses can be generated. The superposed chirp pulses have the resulting average Amplitude Uo.
Submission
Slide 15
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
BACKWARD COMPATIBILITY
• MDMA is very similar to DSSS
• A few simple hardware modifications to
a pure MDMA solution allows backwardcompatibility
• It may even be possible to sense all 15
DSSS channels at the “same” time.
Submission
Slide 16
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
COEXISTENCE
• MDMA’s power spectral density is lower
than O-QPSK for the same transmit
power
• 802.15.4’s duty cycle is very low
• MDMA’s packet duration is shorter than
that of O-QPSK
• Based on the above, we believe that
coexistence is not an issue
Submission
Slide 17
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
BENEFITS
• HIGH
– Performance (high symbol rate)
– Reliability (predictable minimum range,
network planning)
– Simplicity (analog signal processing)
– Robustness against multipath fading
– Robustness against interference
• Location-awareness (wideband, chirps)
Submission
Slide 18
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
BENEFITS
• LOW
– Transmit power
– Energy per bit
– Cost
– Latency
• No synch chips
• Reduced retransmits
Submission
Slide 19
Koslar, Ianelli, Nanotron Technologies
doc.: IEEE 802.15-03/169r0
March 2003
NEW APPLICATIONS
• Mission critical (e.g. industrial)
• Longer battery life
• Low latency tolerance applications (e.g.
control, gaming, streaming)
• Device sharing/participating among
multiple networks (multiple
simultaneous channel sensing)
Submission
Slide 20
Koslar, Ianelli, Nanotron Technologies