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IEEE802dot11a >
   Puncturer, 802.11a (PUNC11A)       

Puncturer, 802.11a (PUNC11A)

 

 


Property

Description

Units

Default

Range/Type

CODING

Coding Rate Type

None

0

[0, 2]/Integer

RIN

Input impedance

Ohm

Inf

(0, Inf]/Real

ROUT

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

Bits before puncturing (integer)

Output

Output signal (complex)

 

Limits

 

 

 

Notes

1. This model can be used to increase coding rate by employing “puncturing”, according to IEEE 802.11a standard.

2. The DATA field, composed of SERVICE, PSDU, tail, and pad parts, shall be coded with a convolutional encoder of coding rate R = 1/2, 2/3, or 3/4, corresponding to the desired data rate. The convolutional encoder shall use the industry-standard generator polynomials, g0 = 133 and gl = 171 and , of rate R = 1/2, please refer to the COD11A model. Higher rates are derived from it by employing “puncturing”. Puncturing is a procedure for omitting some of the encoded bits in the transmitter (thus reducing the number of transmitted bits and increasing the coding rate) and inserting a dummy “zero” metric into the convolutional decoder in the receiver in place of the omitted bits. The puncturing patterns are illustrated in Fig.1.

Fig.1A The “puncturing” and “depuncturing” procedure for coding rate R = 3/4

 

Fig. 1b, The “puncturing” and “depuncturing” procedure for coding rate R = 2/3.

Netlist Form

PUNC11A:NAME n1 n2 [CODING =val] [RIN=val] [ROUT=val]

Netlist Example

PUNC11A:1 1 2 CODING= 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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