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IEEE802dot11a >
   Deinterleaver, 802.11a (DEILV11A)       

Deinterleaver, 802.11a (DEILV11A)

 

 


Property

Description

Units

Default

Range/Type

MODULATION

Modulation type

None

0

[0,3]/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

Bits before deinterleaving (integer)

Output

Bits after deinterleaving (integer)

 

Limits

 

Notes

1. This model can be used for data deinterleaving, according to IEEE 802.11a standard.

2. All demodulated data bits shall be deinterleaved by a block deinterleaver with a block size cor­responding to the number of bits in a single OFDM symbol, NCBPS. The deinterleaver, which performs the inverse relation of the interleaver, is also defined by a two-step permutation.

3. Here we shall denote by J the index of the original received bit before the first permutation; i shall be the index after the first and before the second permutation, and k shall be the index after the second permutation, just prior to delivering the coded bits to the convolutional (Vit­erbi) decoder. The first permutation is defined by the rule

(1)
where the function floor (.) denotes the largest integer not exceeding the parameter, and

(2)
This permutation is the inverse of permutation described in Eqn.(2) of the model intlv11a. The second permutation is defined by the rule

(3)
This permutation is the inverse of permutation described in Eqn.(1) of the model intlv11a. In the above equations,NCBPS and NBPSC depend on the base modulation mode, as shown in Table I.

Table I IEEE 802.11a Rate-dependent parameter

 

Data rate

(Mbits/s)

 

Modulation

 

Coding rate

(R)

Coding bits

per

subcarrier

(NBPSC)

Coding bits

per OFDM

symbol

(NCBPS)

Data bits

per OFDM

symbol

(NDBPS)

6

BPSK

1/2

1

48

24

9

BPSK

3/4

1

48

36

12

QPSK

1/2

2

96

48

18

QPSK

3/4

2

96

72

24

16-QAM

1/2

4

192

96

36

16-QAM

3/4

4

192

144

48

64-QAM

2/3

6

288

192

54

64-QAM

3/4

6

288

216

 

Netlist Form

DEILV11A:NAME n1 n2 [MODULATION =val] [RIN=val] [ROUT=val]

Netlist Example

DEILV11A:1 1 2 MODULATION = 2

References

1. IEEE Std 802.11a, Part 11: “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5 GHz Band,” ISO/IEC 8802-11:1999/Amd 1:2000(E).

2. J. Terry and J. Heiskala, Proakis, OFDM Wireless LANs: A Theoretical and Practical Guide, Sams Publishing, 2002.



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