1. March 2003
Project: IEEE P 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: , FAX: ,
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 P 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 P
Koslar, Ianelli, Nanotron Technologies

2. The Principles and Benefits of MDMA
March 2003
The Principles and Benefits of MDMA
Multi Dimensional Multiple Access
New modulation method
Can be wideband or ultra-wideband
Koslar, Ianelli, Nanotron Technologies

3. THE CHANNEL UNRELIABILITY
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THE CHANNEL UNRELIABILITY
Koslar, Ianelli, Nanotron Technologies
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4. March 2003
THE MODEL
Koslar, Ianelli, Nanotron Technologies

5. ECONOMICAL VERSUS TECHNICAL ASPECTS
March 2003
ECONOMICAL VERSUS TECHNICAL ASPECTS
Koslar, Ianelli, Nanotron Technologies

6. UNECONOMIC USE OF ENERGY
March 2003
UNECONOMIC USE OF ENERGY
Koslar, Ianelli, Nanotron Technologies

7. THE VARIATION OF THE BIT ENERGY AND RATE
March 2003
THE VARIATION OF THE BIT ENERGY AND RATE
Solution No. 1: Variation of the bit duration
Koslar, Ianelli, Nanotron Technologies

8. THE ADAPTIVE BIT ENERGY
March 2003
THE ADAPTIVE BIT ENERGY
Koslar, Ianelli, Nanotron Technologies

9. CONSTANT POWER VERSUS FREQUENCY
March 2003
CONSTANT POWER VERSUS FREQUENCY
Solution No. 2: sync pulse shaping
Koslar, Ianelli, Nanotron Technologies

10. CONSTANT POWER VERSUS TIME
March 2003
CONSTANT POWER VERSUS TIME
Solution No. 3: Transformation of AM into FM via a dispersive delay line
Koslar, Ianelli, Nanotron Technologies

11. THE DIFFERENT BT PRODUCTS IN THE CHANNEL AND BASEBAND
March 2003
THE DIFFERENT BT PRODUCTS IN THE CHANNEL AND BASEBAND
Koslar, Ianelli, Nanotron Technologies

12. TIME AND FREQUENCY SPREADING
March 2003
TIME AND FREQUENCY SPREADING
Solution No. 4: Different chirps in amplitude and in frequency spreading
Koslar, Ianelli, Nanotron Technologies

13. March 2003
DUAL SPREADING
Koslar, Ianelli, Nanotron Technologies

14. MULTI DIMENSIONAL ADAPTIVE MATCHED FILTER SYSTEM
March 2003
MULTI DIMENSIONAL ADAPTIVE MATCHED FILTER SYSTEM
Spectral
efficiency
BER
control
Flexibility
Disturbances
Multi path
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.
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.
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.
Noise and disturbances are suppressed by the system gain and/or are spread by the dispersive delay line in the receiver.
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.
Koslar, Ianelli, Nanotron Technologies

15. THE VERSATILE MULTI DIMENSIONAL MODULATION MODES
March 2003
THE VERSATILE MULTI DIMENSIONAL MODULATION MODES
Koslar, Ianelli, Nanotron Technologies

16. BACKWARD COMPATIBILITY
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BACKWARD COMPATIBILITY
MDMA is very similar to DSSS
A few simple hardware modifications to a pure MDMA solution allows backward-compatibility
It may even be possible to sense all 15 DSSS channels at the “same” time.
Koslar, Ianelli, Nanotron Technologies
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17. doc.: IEEE 802.15-<doc#>
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March 2003
COEXISTENCE
MDMA’s power spectral density is lower than O-QPSK for the same transmit power
’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
Koslar, Ianelli, Nanotron Technologies
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18. doc.: IEEE 802.15-<doc#>
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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)
Koslar, Ianelli, Nanotron Technologies
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19. doc.: IEEE 802.15-<doc#>
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March 2003
BENEFITS
LOW
Transmit power
Energy per bit
Cost
Latency
No synch chips
Reduced retransmits
Koslar, Ianelli, Nanotron Technologies
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20. doc.: IEEE 802.15-<doc#>
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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)
Koslar, Ianelli, Nanotron Technologies
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