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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [FEC and modulations options and proposal for TG4a ] Date Submitted: [30-Sep-2005] Source: [Laurent Ouvry, Samuel Dubouloz] Company [CEA-Leti] Address [17 rue des Martyrs 38054 Grenoble]

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Project ieee p802 15 working group for wireless personal area networks wpans 5677877

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [FEC and modulations options and proposal for TG4a ]

Date Submitted: [30-Sep-2005]

Source: [Laurent Ouvry, Samuel Dubouloz]

Company [CEA-Leti]

Address [17 rue des Martyrs 38054 Grenoble]

Voice:[+33-4-38-38-93-88 ], FAX: [+ 33-4-38-38-51-59 ],

E−Mail: [[email protected]; [email protected]]

Re: [802.15.4a.]

Abstract:[Gives the current FEC and modulation proposals for TG4a]

Purpose:[To promote discussion in 802.15.4a.]

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.

L. Ouvry, S. Dubouloz, CEA-Leti


Outline

Outline

  • Reference documents

  • Baseline

  • What we propose

  • Simulations

L. Ouvry, S. Dubouloz, CEA-Leti


Reference documents to build this one

Reference documents to build this one

  • IEEE.802.15-05-0XXX-0Y-004a

    • XXXrY (…)

    • 424r1 (simulation framework)

    • 389r2 (band plan)

    • 456r1 and 456r2 (preamble)

    • 466r0 (amendment to the preamble)

    • 428r0 (PRF and peak power)

    • 528r0 (modulation and scrambler structure)

    • 600r0 (FEC options and their numbering !)

L. Ouvry, S. Dubouloz, CEA-Leti


Modulation from 582r0

Modulation(from 582r0)

L. Ouvry, S. Dubouloz, CEA-Leti


Scrambler example from 582r0

Scrambler example (from 582r0)

L. Ouvry, S. Dubouloz, CEA-Leti


Modulation bursts and peak prf

S = +--+-++-

=

S

1 chip ~ 2 ns

burst duration = TB

= 8 chips ~ 16 ns

symbol duration ~ 1.0us = 512 chips = 64 TB (FEC 5 option)

Modulation : bursts and peak PRF

  • Proposed peak PRF of 494 MHz, with S code of length 8 (TBC)

    • S code duration = 8 / peak PRF ~ 16 ns

    • Chip duration is 1/peak PRF

L. Ouvry, S. Dubouloz, CEA-Leti


Modulation base is fec 5 see slide 12 or 600r0

47

47

47

47

48

48

48

48

0

0

0

0

1

1

1

1

31

31

31

31

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32

32

33

33

33

33

63

63

63

63

15

15

15

15

16

16

16

16

burst

PPI = 32 bursts = 512ns

symbol duration ~ 1.0us = 64 TB (FEC 5 option)

Modulation : base is FEC 5see slide 12 or 600r0

PPM bit (seen by coherent and non coherent receiver)

BPSK bit (seen by coherent receiver only)

S

-S

S

-S

L. Ouvry, S. Dubouloz, CEA-Leti


Scrambling tbc

S

S

S

S

47

47

47

47

48

48

48

48

0

0

0

0

1

1

1

1

31

31

31

31

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32

33

33

33

33

63

63

63

63

15

15

15

15

16

16

16

16

-S

-S

-S

-S

S

S

S

-S

-S

-S

Scrambling (TBC)

possible positions obtained through scrambling

Guard time for channel delay spread (260ns)

S

-S

S

-S

  • Remark : S value is also changed at each symbol

L. Ouvry, S. Dubouloz, CEA-Leti


Proposal 6 4 ppm bpsk

S

S

S

S

S

S

S

S

23

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24

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47

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0

0

0

0

0

0

0

0

31

31

31

31

31

31

31

31

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32

32

32

32

32

32

32

63

63

63

63

63

63

63

63

7

7

7

7

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7

7

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8

8

8

8

8

8

15

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15

15

15

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16

16

16

-S

-S

-S

-S

-S

-S

-S

-S

Proposal 6 : 4-PPM + BPSK

Guard time for channel delay spread (130ns)

L. Ouvry, S. Dubouloz, CEA-Leti


Proposal 6 4 ppm bpsk1

S

S

S

S

S

S

S

S

23

23

23

23

23

23

23

23

24

24

24

24

24

24

24

24

39

39

39

39

39

39

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39

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40

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40

40

40

47

47

47

47

47

47

47

47

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48

48

48

48

56

56

56

56

56

56

56

56

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57

57

57

57

0

0

0

0

0

0

0

0

31

31

31

31

31

31

31

31

32

32

32

32

32

32

32

32

63

63

63

63

63

63

63

63

7

7

7

7

7

7

7

7

8

8

8

8

8

8

8

8

15

15

15

15

15

15

15

15

16

16

16

16

16

16

16

16

-S

-S

-S

-S

-S

-S

-S

-S

Proposal 6 : 4-PPM + BPSK

PPM bits (seen by both receivers)

BPSK bit (seen by coherent receiver only)

L. Ouvry, S. Dubouloz, CEA-Leti


Fec 6 details

Viterbi

1/3

Convolutional

1/3

Viterbi

1/2

FEC 6 Details

Common Rb at PHY SAP +

Coder + Modulation Mapping

Non Coherent Receiver

(only 4-PPM)

Non Coherent Receiver

(4-PPM + Polarity)

L. Ouvry, S. Dubouloz, CEA-Leti


Fec options from 600r0

FEC Options (from 600r0)

Coherent Receiver: True Rate = ¼

Non Coherent Receiver: Equivalent to Rate = ½

(Rate ¼ with erasures)

SOC code

K= 3,4 or 5

R = 1/4

FEC 1

Coherent Receiver: True Rate = ¼

Non Coherent Receiver: Equivalent to Rate = ½

(Rate ¼ with erasures)

Convolutional Encoder

K= 3,4 or 5

R= 1/4

FEC 2

Systematic

Convolutional

Encoder

K= 3,4 or 5

R = 1/2

Convolutional

Encoder

K=3, R= 1/2

Coherent Receiver: Concatenated code, Rate = ¼

Non Coherent Receiver: Convolutional code, Rate = ½

FEC 3

Systematic

Convolutional

Encoder

K= 3,4 or 5

R = 1/2

BCH or RS

GF(28): RS(40,32)

GF(26): RS(53,43)

Coherent Receiver: Concatenated code Rate = 0.4

Non Coherent Receiver: RS code, Rate = 0.8

FEC 4

Systematic Convolutional Encoder

K= 3,4 or 5

R= 1/2

Coherent Receiver:Convolutionalcode Rate = ½

Non Coherent Receiver: Uncoded

FEC 5

Convolutional Encoder

K= 3,4 or 5

R= 1/3

Coherent Receiver:Convolutionalcode Rate = 1/3

Non Coherent Receiver: Convolutionalcode Rate = 1/2

FEC 6

L. Ouvry, S. Dubouloz, CEA-Leti


So what we propose in fec 6 is

So what we propose in FEC 6 is:

 Perfect compatibility between Tx and coherent and

non-coherent Rx

L. Ouvry, S. Dubouloz, CEA-Leti


Summary of rates modifed from 600r0

Summary of rates (modifed from 600r0)

Options we intend to simulate and compare

L. Ouvry, S. Dubouloz, CEA-Leti


Simulations under work

Simulations under work

Options 3, 5 and 6 :

  • For coherent and non coherent

  • With soft and hard decisions

  • With K=3 and 5

    Then with :

  • Scrambling and peak PRFs of 494 & 247 MHz

  • Checking of spectrum compliance with FCC (thanks to15-05-0354-01-004a-UWB-Power-Measurements.zip)

L. Ouvry, S. Dubouloz, CEA-Leti


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