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System Simulator >
System Component Models >
IEEE802dot11a >
Convolutional Encoder, 802.11a (COD11A)

Convolutional Encoder, 802.11a (COD11A)

Property	Description	Units	Default	Range/Type
PURPOSE	Signal field {0}, DATA field {1}	None	1	[0,1]/Integer
MODULATION	Modulation Type	None	0	[0, 3]/Integer
CODING	Coding Rate type	None	0	[0, 2]/Integer
LENGTH	Length of PSDU (number of octets)	None	100	[1, 4095]/Integer
RIN	Input impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input	Bits before encoding (integer)
Output	Bits after encoding (integer)

Limits

Notes

1. This model can be used to encode the DATA field and SIGNAL field according to IEEE 802.11a standard.

2. The convolutional encoder shall use the industry-standard generator polynomials,g_d = 133 and g_l = 171 , of rate R = 1/2, as shown in Fig.1. The bit denoted as “A” shall be output from the encoder before the bit denoted as “B.”

3. The initial state of convolutional encoder is set to “all zero.” When the next DATA field arrives, the initial state of convolutional encoder is reset to “all zero”. The number of bits of DATA field, N_Data, can be determined by the three parameters, Modulation, Coding, and Length. For the calculation of N_Data, please refer to the PAD11A model.

Fig.1 Convolutional encoder

Netlist Form

COD11A:NAME n1 n2 [PURPOSE =val] [MODULATION =val]
+ [CODING =val] [LENGTH =val] [RIN=val] [ROUT=val]

Netlist Example

COD11A:1 1 2 MODULATION = 2 CODING= 2 LENGTH = 100

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.

3. J. G. Proakis, Digital Communications, McGraw-Hill, 2001.

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