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IEEE802dot11a >
   Signal Field Bits Generator, 802.11a (SIG11A)       

Signal Field Bits Generator, 802.11a (SIG11A)

 

 


Property

Description

Units

Default

Range/Type

MODULATION

Modulation Type

None

0

[0, 3]/Integer

CODING

Coding Rate Length

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

Output

Output signal (integer)

 

Limits

Notes

1. This model can be used to generate the contents of the SIGNAL field, according to IEEE 802.11a standard.

2. The SIGNAL field contains the RATE and the LENGTH fields. The RATE field conveys information about the type of modulation and the coding rate as used in the rest of the packet. The encoding of the SIGNAL single OFDM symbol shall be performed with BPSK modula­tion of the subcarriers and using convolutional coding at R = 1/2.

 The contents of the SIGNAL field are not scrambled. The SIGNAL field shall be composed of 24 bits, as illustrated in Fig.1. The four bits 0 to 3 shall encode the RATE. Bit 4 shall be reserved for future use. Bits 5~16 shall encode the LENGTH field, with the least significant bit (LSB) being transmitted first.

3. Data rate (RATE): The bits R1~R4 shall be set, dependent on RATE, according to the values in Table I. The data rate is determined by the two parameters, Modulation and Coding, as shown in Table II.

4. PLCP length field (LENGTH): The PLCP length field shall be an unsigned 12-bit integer that indicates the number of octets in the PSDU that the MAC is currently requesting the PHY to transmit. This value is used to determine the number of octet transfers that will occur between the MAC and the PHY after receiving a request to start transmission. The LSB shall be trans­mitted first in time.

5. Parity (P), Reserved (R), and SIGNAL tail (SIGNAL TAIL): The Bit 4 shall be reserved for future use. Bit 17 shall be a positive parity (even parity) bit for bits 0~16. The bits 18–23 con­stitute the SIGNAL TAIL field, and all 6 bits shall be set to zero.

Fig.1 SIGNAL field bit assignment

Table I Contents of IEEE 802.11a SIGNAL field

Rate (Mbits/s)

R1~R4

6

1101

9

1111

12

0101

18

0111

24

1001

36

1011

48

0001

54

0011

Table II IEEE 802.11a Rate-dependent parameter

 

Data rate

(Mbits/s)

 

Modulation

 

Coding rate

(R)

Coding bits

per

subcarrier

()

Coding bits

per OFDM

symbol

()

Data bits

per OFDM

symbol

()

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

SIG11A:NAME n1 n2 [MODULATION =val] [CODING =val]
+ [LENGTH =val] [RIN=val] [ROUT=val]

Netlist Example

SIG11A: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).



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